Dr. Victor Giurgiutiu Profile

Dr. Victor Giurgiutiu

at Univ of South Carolina

SPIE Involvement:

Conference Program Committee | Author

Publications (109)

Proceedings Article | 22 March 2021 Presentation + Paper

Pure SH0 wave tomography for delamination detection in aerospace composites

Hanfei Mei, Robin James, Victor Giurgiutiu

Proceedings Volume 11593, 115930P (2021) https://doi.org/10.1117/12.2582877

KEYWORDS: Composites, Tomography, Aerospace engineering, Wave plates, Ultrasonography, Inspection, Damage detection, X-rays, X-ray imaging, Waveguides

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Proceedings Article | 22 March 2021 Presentation + Paper

Experimental investigation of the delamination severity in a composite plate using NDT and SHM techniques

Asaad Migot, Saleem Ethaib, Victor Giurgiutiu

Proceedings Volume 11588, 115880K (2021) https://doi.org/10.1117/12.2582568

KEYWORDS: Structural health monitoring, Nondestructive evaluation, Composites, Waveguides, Semiconducting wafers, Doppler effect, Aerospace engineering, Active sensors

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The invisibility behavior of initiation and growing a delamination in an aerospace structure makes it one of the most dangerous and catastrophic damages. In this paper, the non-destructive testing (NDT) and structural health monitoring (SHM) techniques were used to visualize and quantify three different sizes of simulated delaminations inserted in a crossply CFRP plate. An experiment of using RollerFORM and OmniScan equipment was conducted to verify and visualize three simulated delaminations. The guided waves-based developed imaging methods with a sufficient network of piezoelectric wafer active sensors was performed to quantify the shape and size of simulated delaminations. The groupvelocity directivity plots were determined based on the mechanical properties of the interested specimen to estimate the group velocity values of incident and scattered waves. A simple method was developed to estimate the group velocity values of incident and scattered waves at each point of interested area based on the group-velocity directivity plots of propagating Lamb modes and the coordinates of transmitter and receiver transducers. The results demonstrate the capability of the developed imaging method for quantifying the size and shape of interested delaminations. The interaction of guided waves with delaminations were visualized experimentally using scanning laser Doppler vibrometer (SLDV). The effect of the delamination severity on the trapped waves generated over the delamination region was studied experimentally. It was found that delamination size can affect trapped waves. The large delamination has strong trapped waves compared with the small delamination which has weak trapped waves. The wavenumber analysis was conducted for the experimental wavefield data to study the effect of delamination severity on wavenumber components and to identify the delaminations. The result showed that new wavenumber components can affected by the delamination severity. The significant new wavenumber components due to strong trapped waves can be observed for the large delamination case.

Proceedings Article | 2 June 2020 Presentation + Paper

SH-mode guided-wave impact damage detection in thick quasi-isotropic composites

Robin James, Hanfei Mei, Victor Giurgiutiu

Proceedings Volume 11381, 113810R (2020) https://doi.org/10.1117/12.2559757

KEYWORDS: Composites, Acquisition tracking and pointing, Transducers, Damage detection, Manufacturing, Inspection, Structural health monitoring, Phased arrays, Waveguides, Distance measurement

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Due to the extensive use of composite materials in aerospace structures, they are highly susceptible to various types of damage including barely visible impact damage (BVID) due to low-velocity impact events such as bird strikes and runway debris. Implementation of guided-wave based structural health monitoring (SHM) for BVID detection in composites has been extremely challenging due to the anisotropic nature of composites and the complex wave-damage interaction with impact damage. This paper presents a new methodology for the detection of BVID in composites using selectively pure shear horizontal (SH) guided wave mode generated by angle beam transducers (ABT) and received by phased array transducers (PAT). In this methodology, pure SH0 wave excitation was achieved using the angle beam transducers and variable angle wedges and after propagation in the composite it was received by the phased array transducer. First, the semi-analytical finite element (SAFE) method was used to generate the guided wave dispersion curves and the corresponding tuning angle for the SH0 mode excitation was obtained based on Snell’s law. Then, pitch-catch experiments using the ABT-PAT transducer pair were conducted to validate the pure SH0 mode excitation. After this, impact damage experiments were conducted on multiple quasi-isotropic carbon fiber reinforced polymer (CFRP) composite plates having different thicknesses by conforming to the ASTM D7136 standard to generate controlled impact damage size of 1". Next, impact damage detection experiments using pure SH0 mode at 500 kHz, were conducted using the ABT-PAT transducer pair. It was observed that pure SH0 mode was sensitive to the impact damage as a significant decrease in the signal amplitude and mode conversion was observed. With our experiments, we demonstrated the validity and usefulness of this technique for impact damage detection in composite structures. An invention disclosure describing the use of angle beam transducers for SH wave excitation method has been filed and is in the process of becoming a provisional patent.

Proceedings Article | 26 May 2020 Paper

Acoustic emission (AE) fatigue-crack source modeling and simulation using moment tensor concept

Roshan Joseph, Victor Giurgiutiu

Proceedings Volume 11379, 113791J (2020) https://doi.org/10.1117/12.2559958

KEYWORDS: Sensors, Acoustic emission, Modeling and simulation, Acoustics, Signal detection, Computer simulations, Wave propagation, Waveguides, Aluminum, Metals

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Proceedings Article | 19 May 2020 Presentation + Paper

Impact damage detection in composite plates using acoustic emission signal signature identification

Robin James, Roshan Joseph, Victor Giurgiutiu

Proceedings Volume 11376, 113760K (2020) https://doi.org/10.1117/12.2559747

KEYWORDS: Composites, Manufacturing, Acoustic emission, Structural health monitoring, Inspection, Damage detection, Signal detection, Signal analyzers, Time-frequency analysis, Data analysis, Passive sensors

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Proceedings Article | 18 May 2020 Presentation + Paper

Simulation of guided wave under varying temperature and load conditions

Chong Cheng, Hanfei Mei, Victor Giurgiutiu, Shenfang Yuan, Fang Fang, Robin James

Proceedings Volume 11381, 113810H (2020) https://doi.org/10.1117/12.2559702

KEYWORDS: Waveguides, Phase velocity, Wave propagation, Aluminum, Structural health monitoring, Temperature metrology, Transducers, Finite element methods, Receivers, Dispersion

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Proceedings Article | 22 April 2020 Presentation + Paper

Damage detection in laminated composites using pure SH guided wave excited by angle beam transducer

Hanfei Mei, Robin James, Victor Giurgiutiu

Proceedings Volume 11381, 113810P (2020) https://doi.org/10.1117/12.2559558

KEYWORDS: Composites, Transducers, Wave plates, Waveguides, Damage detection, Structural health monitoring, Transmitters, Inspection, 3D modeling, Wave propagation

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Proceedings Article | 22 April 2020 Presentation + Paper

Impact localization on composite plates using two developed imaging methods

Asaad Migot, Yeasin Bhuiyan, Victor Giurgiutiu

Proceedings Volume 11376, 113760V (2020) https://doi.org/10.1117/12.2558277

KEYWORDS: Sensors, Composites, Transducers, Wavelet transforms, Acoustics, Oscilloscopes, Wave propagation, Aerospace engineering, Semiconducting wafers, Active sensors

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Proceedings Article | 1 April 2019 Presentation + Paper

Eddy current non-destructive evaluation of manufacturing flaws and operational damage in CFRP composites

Robin James, Mohammad Faisal Haider, Victor Giurgiutiu, David Lilienthal

Proceedings Volume 10971, 109711N (2019) https://doi.org/10.1117/12.2515505

KEYWORDS: Composites, Manufacturing, Polymers, Ultrasonics, Nondestructive evaluation, Inspection, Resistance, Carbon, Finite element methods

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Proceedings Article | 1 April 2019 Presentation + Paper

An improved analytical method to overcome convergence issues in composites guided wave prediction

Mohammad Faisal Haider, Vicotr Giurgiutiu

Proceedings Volume 10972, 109720L (2019) https://doi.org/10.1117/12.2515329

KEYWORDS: Composites, Waveguides, Testing and analysis, Wave propagation, Aluminum, Structural health monitoring, Phase velocity, Wave plates

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Proceedings Article | 1 April 2019 Presentation + Paper

Wave damage interaction in metals and composites

Hanfei Mei, Victor Giurgiutiu

Proceedings Volume 10972, 109720O (2019) https://doi.org/10.1117/12.2513548

KEYWORDS: Finite element methods, Composites, Scattering, Waveguides, Metals, 3D modeling

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Proceedings Article | 1 April 2019 Presentation + Paper

An experimental evaluation of Helmholtz potentials as a source of acoustic emission due to fatigue crack

Mohammad Faisal Haider, Roshan Joseph, Victor Giurgiutiu

Proceedings Volume 10971, 1097115 (2019) https://doi.org/10.1117/12.2515330

KEYWORDS: Acoustic emission, Signal detection, Algorithm development, Wave propagation, Waveguides, Acoustics, Sensors, Signal processing, Wave plates

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Proceedings Article | 21 March 2019 Paper

Piezoelectric wafer active sensors for sensing acoustic emission due to crack rubbing/clapping

Roshan Joseph, Md Yeasin Bhuiyan, Victor Giurgiutiu

Proceedings Volume 10967, 109672A (2019) https://doi.org/10.1117/12.2515314

KEYWORDS: Acoustic emission, Finite element methods, Semiconducting wafers, Active sensors, Aluminum, Sensors, Source localization, Modal analysis, Active remote sensing

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Proceedings Article | 27 March 2018 Paper

Piezoelectric wafer active sensors under gamma radiation exposure toward applications for structural health monitoring of nuclear dry cask storage systems

Mohammad Faisal Haider, Hanfei Mei, Bin Lin, Lingyu Yu, Victor Giurgiutiu, Poh-Sang Lam, Christopher Verst

Proceedings Volume 10599, 105992F (2018) https://doi.org/10.1117/12.2297390

KEYWORDS: Transducers, Gamma radiation, Ferroelectric materials, Structural health monitoring, Capacitance, Semiconducting wafers, Active sensors, Crystals, Sensors, Radiation effects

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Proceedings Article | 27 March 2018 Presentation + Paper

Guided wave crack detection and size estimation in stiffened structures

Md Yeasin Bhuiyan, Mohammad Faisal Haider, Banibrata Poddar, Victor Giurgiutiu

Proceedings Volume 10599, 105991Y (2018) https://doi.org/10.1117/12.2309975

KEYWORDS: Waveguides, Ultrasonics, Defect inspection, Inspection, Nondestructive evaluation, Structural health monitoring, Wave plates, Corrosion, Structural engineering, Defect detection

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Proceedings Article | 27 March 2018 Presentation + Paper

Predictive 1D and 2D guided-wave propagation in composite plates using the SAFE approach

Hanfei Mei, Victor Giurgiutiu

Proceedings Volume 10600, 106000P (2018) https://doi.org/10.1117/12.2296566

KEYWORDS: Composites, Wave propagation, Waveguides, Dispersion, Phase velocity, Chemical elements, Finite element methods, Structural health monitoring, Aluminum, Mathematical modeling

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Proceedings Article | 27 March 2018 Presentation + Paper

Acoustic emission and active sensing capabilities on full-scale nuclear dry cask storage structures

Stephen Howden, Bin Lin, Lingyu Yu, Victor Giurgiutiu

Proceedings Volume 10601, 1060109 (2018) https://doi.org/10.1117/12.2297441

KEYWORDS: Sensors, Active remote sensing, Acoustic emission, Transducers, Acoustics, Ultrasonics, Structural health monitoring, Sensing systems

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Proceedings Article | 27 March 2018 Presentation + Paper

Active health monitoring of TN32 dry cask using a scaled down model

Roshan Joseph, Stephen Howden, Bin Lin, Lingyu Yu, Victor Giurgiutiu

Proceedings Volume 10600, 106000B (2018) https://doi.org/10.1117/12.2297278

KEYWORDS: Wave propagation, Sensors, Waveguides, Photovoltaics, Distortion, Transducers, Adhesives, Drug discovery, Lead, Phase velocity

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Proceedings Article | 28 April 2017 Presentation + Paper

Acoustic emission source modeling in a plate using buried moment tensors

Roshan Joseph, Md. Yeasin Bhuiyan, Victor Giurgiutiu

Proceedings Volume 10170, 1017028 (2017) https://doi.org/10.1117/12.2260167

KEYWORDS: Acoustic emission, Indium nitride, Wave propagation, Structural health monitoring, Waveguides, Wave plates, Aluminum, Mendelevium, Mechanical engineering, Active sensors

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Proceedings Article | 28 April 2017 Open Access

Predictive simulation of guide-wave structural health monitoring

Victor Giurgiutiu

Proceedings Volume 10170, 1017002 (2017) https://doi.org/10.1117/12.2263325

KEYWORDS: Transmitters, Receivers, Wave propagation, Transducers, Signal detection, Wave plates, Analytical research, Structural health monitoring, Inverse problems, Waveguides, Finite element methods, Sensors, Smart structures

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Proceedings Article | 19 April 2017 Presentation + Paper

Sensing capabilities of piezoelectric wafer active sensors in extreme nuclear environment

Mohammad Faisal Haider, Bin Lin, Lingyu Yu, Victor Giurgiutiu

Proceedings Volume 10169, 101691Z (2017) https://doi.org/10.1117/12.2260162

KEYWORDS: Transducers, Capacitance, Radiation effects, Structural health monitoring, Gamma radiation, Sensors, Semiconducting wafers, Active sensors, Ferroelectric materials, Active remote sensing, Environmental sensing, Crystals

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There is considerable demand for structural health monitoring (SHM) at locations where there are substantial radiation fields such as nuclear reactor components, dry cask storage canister, irradiated fuel assemblies, etc. Piezoelectric wafer active sensors (PWAS) have been emerged as one of the major SHM sensing technologies. In order to use PWAS to perform SHM in nuclear environment, radiation influence on sensor and sensing capability needs to be investigated to assure the reliability of the PWAS based method. Radiation may cause degradation or even complete failure of sensors. Gamma radiation is one of the major radiation sources near the nuclear source. Therefore, experimental investigation was completed on the gamma radiation endurance of piezoelectric sensors. The irradiation test was done in a Co-60 Gamma Irradiator. Lead Zirconate Titanate (PZT) and Gallium Orthophosphate (GaPO4) PWAS were exposed under gamma radiation at 100 Gy/hr rate for 20 hours. Electro-mechanical (E/M) admittance signatures and electrical capacitance were measured to evaluate the PWAS performance before and after every 4 hours exposure to gamma radiation. PWAS were kept at room temperature for 6 days after each 4 hours radiation exposure to investigate the effect of time on PWAS by gamma radiation. It was found that, PZT-PWAS show variation in resonance frequency for both in plane and thickness mode E/M admittance. Where, the changes in resonance amplitudes are larger for PZT-PWAS. GaPO4-PWAS E/M impedance/admittance spectra don’t show any reasonable change after gamma irradiation. A degradation behavior of electrical properties in the PZT-PWAS was observed. Capacitance value of PZT-PWAS decreases from 3.2 nF to 3.07 nF after exposing to gamma radiation for 20 hours at 100Gy/hour. This degradation behavior of electrical properties may be explained by the pinning of domain walls by some radiation induced effect. GaPO4-PWAS doesn’t show reasonable degradation in electrical properties. GaPO4 has good radiation endurance, although amplitude sensitivity is relatively low.

Proceedings Article | 5 April 2017 Presentation + Paper

Analysis of acoustic emission waveforms from fatigue cracks

Md. Yeasin Bhuiyan, Jingjing Bao, Banibrata Poddar, Victor Giurgiutiu

Proceedings Volume 10170, 101702A (2017) https://doi.org/10.1117/12.2258337

KEYWORDS: Acoustic emission, Physics, Wave propagation, Aircraft structures, Nondestructive evaluation, Structural health monitoring, Finite element methods, Failure analysis, Statistical analysis, Laser induced plasma spectroscopy, Physical phenomena, Aluminum, Mouth, Sensors, Microscopes

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Proceedings Article | 20 April 2016 Paper

Acoustic emission detection with fiber optical sensors for dry cask storage health monitoring

Bin Lin, Jingjing Bao, Lingyu Yu, Victor Giurgiutiu

Proceedings Volume 9803, 98031H (2016) https://doi.org/10.1117/12.2219337

KEYWORDS: Fiber Bragg gratings, Fiber optics sensors, Sensors, Acoustic emission, Structural health monitoring, Fiber optics, Safety, Sensor technology, Fiber optics tests, Ultrasonics, Tunable lasers, Waveguides

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Proceedings Article | 15 April 2016 Presentation + Paper

Fast and accurate analytical model to solve inverse problem in SHM using Lamb wave propagation

Banibrata Poddar, Victor Giurgiutiu

Proceedings Volume 9804, 98041J (2016) https://doi.org/10.1117/12.2218143

KEYWORDS: Inverse problems, Structural health monitoring, Wave propagation, Scattering, Analytical research, Waveguides, Finite element methods, Vector spaces, Wave plates, Nondestructive evaluation, Damage detection

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Proceedings Article | 8 April 2016 Paper

A unified formulation for guided-wave propagation in multi-layered mixed anisotropic-isotropic hybrid aerospace composites

Darun Barazanchy, Victor Giurgiutiu

Proceedings Volume 9804, 98040A (2016) https://doi.org/10.1117/12.2218141

KEYWORDS: Composites, Aerospace engineering, Anisotropy, Wave propagation, Electroluminescent displays, Aluminum, Dispersion, Nondestructive evaluation, Matrices, Metals

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Proceedings Article | 1 April 2016 Presentation + Paper

Ultrasonic inspection of multiple-rivet-hole lap joint cracks using global analysis with local finite element approach

Yeasin Bhuiyan, Yanfeng Shen, Victor Giurgiutiu

Proceedings Volume 9805, 98051Z (2016) https://doi.org/10.1117/12.2235645

KEYWORDS: Signal detection, Finite element methods, Ultrasonics, Inspection, Scattering, Smart structures, Wave plates, Wave propagation, 3D modeling, Analytical research, Structural health monitoring

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Proceedings Article | 1 April 2016 Paper

Identifying fatigue crack geometric features from acoustic emission signals

Jingjing Bao, Banibrata Poddar, Victor Giurgiutiu

Proceedings Volume 9805, 98051J (2016) https://doi.org/10.1117/12.2219307

KEYWORDS: Nondestructive evaluation, Structural health monitoring, Acoustic emission, Physics, Finite element methods, Waveguides, Active sensors, Wave propagation, Velocity measurements, Signal processing, Laser Doppler velocimetry, Transducers

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Proceedings Article | 1 April 2015 Paper

Experimental validation of analytical model for Lamb wave interaction with geometric discontinuity

Banibrata Poddar, Victor Giurgiutiu

Proceedings Volume 9437, 94371Y (2015) https://doi.org/10.1117/12.2084298

KEYWORDS: Finite element methods, Scattering, Structural health monitoring, Ultrasonics, Adaptive optics, Reflection, Nondestructive evaluation, Damage detection, Inspection, Wavefronts

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Proceedings Article | 1 April 2015 Paper

Adhesive disbond detection using piezoelectric wafer active sensors

William Roth, Victor Giurgiutiu

Proceedings Volume 9437, 94370S (2015) https://doi.org/10.1117/12.2084414

KEYWORDS: Adhesives, Inspection, Electromagnetic coupling, Semiconducting wafers, Active sensors, Finite element methods, Aluminum, Manufacturing, Reflection, Structural health monitoring

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Proceedings Article | 27 March 2015 Paper

Modeling, optimization, and experimental validation of a resonant piezo-optical ring sensor for enhanced active and passive structural health monitoring

Erik Frankforter, Jingjing Bao, Bin Lin, Victor Giurgiutiu

Proceedings Volume 9436, 94360B (2015) https://doi.org/10.1117/12.2084457

KEYWORDS: Sensors, Fiber Bragg gratings, Structural health monitoring, Aluminum, Wave plates, Acoustic emission, Receivers, Active sensors, Wave propagation, Finite element methods

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Proceedings Article | 27 March 2015 Paper

Developing a structural health monitoring system for nuclear dry cask storage canister

Xiaoyi Sun, Bin Lin, Jingjing Bao, Victor Giurgiutiu, Travis Knight, Poh-Sang Lam, Lingyu Yu

Proceedings Volume 9439, 94390N (2015) https://doi.org/10.1117/12.2085045

KEYWORDS: Structural health monitoring, Temperature metrology, Sensors, Nondestructive evaluation, Ultrasonics, Electromagnetic coupling, Sensing systems, Waveguides, Wave propagation, Semiconducting wafers

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Proceedings Article | 27 March 2015 Paper

Thermal effect on E/M impedance spectroscopy of piezoelectric wafer active sensors

Tuncay Kamas, Erik Frankforter, Lingyu Lucy Yu, Bin Lin, Victor Giurgiutiu

Proceedings Volume 9435, 94350O (2015) https://doi.org/10.1117/12.2083958

KEYWORDS: Electromagnetic coupling, Capacitance, Temperature metrology, Ferroelectric materials, Dielectric spectroscopy, Semiconducting wafers, Active sensors, Structural health monitoring, Thermal effects, Resonators

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Proceedings Article | 10 April 2014 Paper

Development of optical equipment for ultrasonic guided wave structural health monitoring

Bin Lin, Victor Giurgiutiu

Proceedings Volume 9062, 90620R (2014) https://doi.org/10.1117/12.2045070

KEYWORDS: Fiber Bragg gratings, Ultrasonics, Sensors, Structural health monitoring, Waveguides, Tunable lasers, Sensing systems, Wafer-level optics, Software development, Multiplexing

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Proceedings Article | 10 April 2014 Paper

Piezo-optical measurements for guided wave and acoustic emission structural health monitoring

Erik Frankforter, Bin Lin, Victor Giurgiutiu

Proceedings Volume 9062, 906207 (2014) https://doi.org/10.1117/12.2047483

KEYWORDS: Fiber Bragg gratings, Sensors, Receivers, Waveguides, Structural health monitoring, Wave propagation, Acoustic emission, Ultrasonics, Signal detection, Tunable lasers

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Proceedings Article | 9 March 2014 Paper

WFR-2D: an analytical model for PWAS-generated 2D ultrasonic guided wave propagation

Yanfeng Shen, Victor Giurgiutiu

Proceedings Volume 9064, 906411 (2014) https://doi.org/10.1117/12.2044798

KEYWORDS: Finite element methods, Wave propagation, Structural health monitoring, Chemical elements, Waveguides, Scattering, Sensors, Data modeling, Ultrasonics, Transducers

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Proceedings Article | 9 March 2014 Paper

Stiffness Transfer Matrix Method (STMM) for stable dispersion curves solution in anisotropic composites

Ayman Kamal, Victor Giurgiutiu

Proceedings Volume 9064, 906410 (2014) https://doi.org/10.1117/12.2044789

KEYWORDS: Composites, Wave propagation, Polymers, Nanoimprint lithography, Phase velocity, Waveguides, Computer simulations, Numerical simulations, Wave plates, Algorithm development

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Proceedings Article | 19 April 2013 Paper

Analytical modeling of PWAS in-plane and out-of-plane electromechanical impedance spectroscopy (EMIS)

Tuncay Kamas, Bin Lin, Victor Giurgiutiu

Proceedings Volume 8692, 869227 (2013) https://doi.org/10.1117/12.2009249

KEYWORDS: Electromagnetic coupling, Finite element methods, Aluminum, Active sensors, Dielectric spectroscopy, Sensors, Semiconducting wafers, Commercial off the shelf technology, Resonators, Transducers

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Proceedings Article | 17 April 2013 Paper

Guided wave propagation in carbon composite laminate using piezoelectric wafer active sensors

M. Gresil, V. Giurgiutiu

Proceedings Volume 8695, 869525 (2013) https://doi.org/10.1117/12.2009254

KEYWORDS: Wave propagation, Composites, Signal attenuation, Waveguides, Finite element methods, Wave plates, Transducers, Semiconducting wafers, Fiber reinforced polymers, Carbon

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Proceedings Article | 17 April 2013 Paper

Predictive modeling of PWAS-coupled shear horizontal waves

Ayman Kamal, Bin Lin, Victor Giurgiutiu

Proceedings Volume 8695, 86950F (2013) https://doi.org/10.1117/12.2009399

KEYWORDS: Transducers, Finite element methods, Waveguides, Wave propagation, Aluminum, Nondestructive evaluation, Electrodes, Semiconducting wafers, Sensors, Structural health monitoring

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Proceedings Article | 17 April 2013 Paper

Effects of fastener load on wave propagation through lap joint

Jingjing Bao, Victor Giurgiutiu

Proceedings Volume 8695, 869521 (2013) https://doi.org/10.1117/12.2012185

KEYWORDS: Wave propagation, Waveguides, Sensors, Wave plates, Aluminum, Transducers, Receivers, Transmitters, Semiconducting wafers, Active sensors

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Proceedings Article | 17 April 2013 Paper

Modeling of guided waves for detection of linear and nonlinear structural damage

Yanfeng Shen, Victor Giurgiutiu

Proceedings Volume 8695, 86951S (2013) https://doi.org/10.1117/12.2009119

KEYWORDS: Waveguides, Wave propagation, Finite element methods, Transducers, Chemical elements, Receivers, Active remote sensing, Structural health monitoring, Transmitters, Human-machine interfaces

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Proceedings Article | 11 April 2013 Paper

In-situ health monitoring on steel bridges with dual mode piezoelectric sensors

Lingyu Yu, H. Felix Wu, Victor Giurgiutiu, Paul Ziehl

Proceedings Volume 8694, 869418 (2013) https://doi.org/10.1117/12.2009746

KEYWORDS: Sensors, Bridges, Active remote sensing, Transducers, Inspection, Wave propagation, Signal detection, Signal to noise ratio, Acoustic emission, Aluminum

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Proceedings Article | 2 May 2012 Paper

Status in the development of self-powered wireless sensor node for structural health monitoring and prognosis

Valery Godinez-Azcuaga, Justin Farmer, Paul Ziehl, Victor Giurgiutiu, Antonio Nanni, Daniel Inman

Proceedings Volume 8347, 83471V (2012) https://doi.org/10.1117/12.917522

KEYWORDS: Sensors, Energy harvesting, Bridges, Corrosion, Structural health monitoring, Acoustic emission, Wind energy, Prototyping, Data modeling, Composites

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Proceedings Article | 20 April 2012 Paper

Predictive simulation of nonlinear ultrasonics

Yanfeng Shen, Victor Giurgiutiu

Proceedings Volume 8348, 83482E (2012) https://doi.org/10.1117/12.913950

KEYWORDS: Ultrasonics, Receivers, Transmitters, Wave propagation, Structural health monitoring, Fourier transforms, Finite element methods, Chemical elements, Signal processing, Complex systems

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Proceedings Article | 5 April 2012 Paper

Comparative study of active and passive sensing with AE and PWAS transducers

Lingyu Yu, Victor Giurgiutiu, Jianguo Yu, Paul Ziehl, Liuxian Zhao

Proceedings Volume 8347, 834720 (2012) https://doi.org/10.1117/12.915670

KEYWORDS: Transducers, Sensors, Bridges, Active remote sensing, Wave propagation, Passive remote sensing, Semiconducting wafers, Active sensors, Signal to noise ratio, Signal detection

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Proceedings Article | 3 April 2012 Paper

The use of exact Lamb waves modes for modeling the power and energy transduction of structurally bonded piezoelectric wafer active sensors

Bin Lin, Victor Giurgiutiu, Ayman Kamal

Proceedings Volume 8345, 83450A (2012) https://doi.org/10.1117/12.915895

KEYWORDS: Tin, Transmitters, Waveguides, Structural health monitoring, Ultrasonics, Wave propagation, Acoustics, Particles, Semiconducting wafers, Active sensors

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Proceedings Article | 20 April 2011 Paper

Adaptation of PWAS transducers to acoustic emission sensors

Lingyu Yu, Sepandarmaz Momeni, Valery Godinez, Victor Giurgiutiu

Proceedings Volume 7983, 798327 (2011) https://doi.org/10.1117/12.880157

KEYWORDS: Sensors, Acoustic emission, Transducers, Signal detection, Bridges, Aluminum, Signal to noise ratio, Active sensors, Semiconducting wafers, Interference (communication)

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Proceedings Article | 20 April 2011 Paper

Recent advances in the development of a self-powered wireless sensor network for structural health prognosis

Valery Godinez-Azcuaga, Daniel Inman, Paul Ziehl, Victor Giurgiutiu, Antonio Nanni

Proceedings Volume 7983, 798325 (2011) https://doi.org/10.1117/12.880249

KEYWORDS: Sensors, Bridges, Corrosion, Wind energy, Acoustic emission, Prototyping, Data modeling, Signal detection, Sensor networks, Energy harvesting

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Proceedings Article | 20 April 2011 Paper

Fatigue crack detection in thick steel structures with piezoelectric wafer active sensors

M. Gresil, L. Yu, V. Giurgiutiu

Proceedings Volume 7983, 79832Y (2011) https://doi.org/10.1117/12.882137

KEYWORDS: Wave propagation, Structural health monitoring, Wave plates, Waveguides, Transducers, Sensors, Wavelets, Acoustic emission, Nondestructive evaluation, Signal processing

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This paper presents a set of numerical and experimental results on the use of guided waves for structural health monitoring (SHM) of crack growth during a fatigue test in a thick steel plate used for civil engineering application. The capability of embedded piezoelectric wafer active sensors (PWAS) to perform in situ nondestructive evaluation (NDE) is explored. Numerical simulation and experimental tests are used to prove that PWAS can perform active SHM using guided wave pitch-catch method and passive SHM using acoustic emission (AE). Multi-physics finite element (MPFEM) codes are used to simulate the transmission and reception of guided waves in a 1-mm plate and their diffraction by a through hole. The MP-FEM approach permitted that the input and output variables be expressed directly in electric terms while the two-ways electromechanical conversion was done internally in the MP-FEM formulation. The analysis was repeated for several hole sizes and a damage index performances was tested. AE simulation was performed with the MP-FEM approach in a 13-mm plate in the shape of the compact tension (CT) fracture mechanics specimen. The AE event was simulated as a pulse of defined duration and amplitude. The electrical signal measured at a receiver PWAS was simulated. Daubechies wavelet transform was used to process the signal and identify its Lamb modes and FFT frequency contents. Experimental tests were performed with PWAS transducers acting as passive receivers of AE signals. The 8-mm thick flange of an I beam was instrumented on one side with PWAS transducers and on the other side with conventional AE transducers (PAC R15I) acting as comparison witnesses. An AE source was simulated using 0.5- mm pencil lead breaks; the PWAS transducers were able to pick up AE signal with good strength. Subsequently, PWAS transducers and R15I sensors were applied to a 13-mm CT specimen subjected to accelerated fatigue testing. The PWAS and R15I transducers signals were collected with PAC data acquisition system using the AE-win software. Comparative results of AE hits and source localization from the PWAS and R15I sensors are given. Active sensing in pitch catch mode was applied between the PWAS transducers installed on the CT specimen and damage indexes were calculated and correlated with physical crack growth as measured optically. The paper finishes with summary, conclusion, and suggestions for further work.

Proceedings Article | 14 April 2011 Paper

Simplified 2D modeling of power and energy transduction of piezoelectric wafer active sensors for structural health monitoring

Bin Lin, Victor Giurgiutiu

Proceedings Volume 7981, 79812R (2011) https://doi.org/10.1117/12.880120

KEYWORDS: Transmitters, Receivers, Structural health monitoring, Wave propagation, Ultrasonics, Semiconducting wafers, Active sensors, Sensors, Interfaces, Transducers

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Proceedings Article | 14 April 2011 Paper

Active carbon filter health condition detection with piezoelectric wafer active sensors

Jingjing Bao, Victor Giurgiutiu, Glenn Rubel, Gregory Peterson, Thomas Ball

Proceedings Volume 7981, 79811E (2011) https://doi.org/10.1117/12.880521

KEYWORDS: Carbon, Electromagnetic coupling, Data modeling, Data analysis, Contamination, Sensors, Software development, Dielectric spectroscopy, Active sensors, Semiconducting wafers

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Proceedings Article | 9 April 2010 Paper

Quantification of fatigue cracking in CT specimens with passive and active piezoelectric sensing

Jianguo Yu, Paul Ziehl, Boris Zarate, Juan Caicedo, Lingyu Yu, Victor Giurgiutiu, Brian Metrovich, Fabio Matta

Proceedings Volume 7649, 76490R (2010) https://doi.org/10.1117/12.847945

KEYWORDS: Acoustic emission, Data modeling, Active remote sensing, Bridges, Transducers, Sensors, Lead, Signal to noise ratio, Genetic algorithms, Signal detection

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Proceedings Article | 9 April 2010 Paper

Piezoelectric wafer active sensor guided wave imaging

Lingyu Yu, Victor Giurgiutiu

Proceedings Volume 7648, 76480S (2010) https://doi.org/10.1117/12.847627

KEYWORDS: Imaging arrays, Waveguides, Sensors, Phased arrays, Aluminum, Semiconducting wafers, Active sensors, Wave propagation, Transducers, Image processing

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Proceedings Article | 1 April 2010 Paper

Modeling of power and energy transduction of embedded piezoelectric wafer active sensors for structural health monitoring

Bin Lin, Victor Giurgiutiu

Proceedings Volume 7647, 76472P (2010) https://doi.org/10.1117/12.847580

KEYWORDS: Receivers, Transmitters, Structural health monitoring, Wave propagation, Active sensors, Acoustics, Semiconducting wafers, Sensors, Interfaces, Fourier transforms

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This paper presents a systematic investigation of power and energy transduction in piezoelectric wafer active sensors (PWAS) for structural health monitoring (SHM). After a literature review of the state of the art, the paper develops a simplified pitch-catch model of power and energy transduction of PWAS attached to structure. The model assumptions include: (a) 1-D axial and flexural wave propagation; (b) ideal bonding (pin-force) connection between PWAS and structure; (c) ideal excitation source at the transmitter PWAS and fully-resistive external load at the receiver PWAS. Frequency response functions are developed for voltage, current, complex power, active power, etc. First, we examined PWAS transmitter and determined the active power, reactive power, power rating of electrical requirement under harmonic voltage excitation. It was found that the reactive power is dominant and defines the power requirement for power supply / amplifier for PWAS applications. The electrical and mechanical power analysis at the PWAS structure interface indicates all the active electrical power provides the mechanical power at the interface. This provides the power and energy for the axial and flexural waves power and energy that propagate into the structure. The sum of forward and backward wave power equals the mechanical power PWAS applied to the structure. The parametric study of PWAS transmitter size shows the proper size and excitation frequency selection based on the tuning effects. Second, we studied the PWAS receiver structural interface acoustic and electrical energy transduction. The parametric study of receiver size, receiver impedance and external electrical load gives the PWAS design guideline for PWAS sensing and power harvesting applications. Finally we considered the power flow for a complete pitch-catch setup. In pitch-catch mode, the power flows from electrical source into piezoelectric power at the transmitter; the piezoelectric conduction converts the electrical power into the mechanical interface power at the transmitter PWAS and then into the acoustic wave power travelling in the structure. The wave power arrives at the receiver PWAS and is captured at the mechanical interface between the receiver PWAS and the structure; the captured mechanical power is converted back into electrical power at the receiver PWAS and measured by the receiver electrical instrument. Our numerical simulation and graphical chart show the trends in the power and energy flow behavior with remarkable peaks and valleys that can be exploited for optimum design.

Proceedings Article | 1 April 2010 Paper

Shear lag solution for structurally attached active sensors

Giola Santoni-Bottai, Victor Giurgiutiu

Proceedings Volume 7647, 76472Q (2010) https://doi.org/10.1117/12.847676

KEYWORDS: Active sensors, Transducers, Semiconducting wafers, Chemical elements, Solids, Actuators, Superposition, Structural health monitoring, Sensors, Adhesives

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Proceedings Article | 1 April 2010 Paper

Steel bridge fatigue crack detection with piezoelectric wafer active sensors

Lingyu Yu, Victor Giurgiutiu, Paul Ziehl, Didem Ozevin, Patrick Pollock

Proceedings Volume 7647, 76471Y (2010) https://doi.org/10.1117/12.847603

KEYWORDS: Sensors, Acoustic emission, Bridges, Active remote sensing, Signal detection, Semiconducting wafers, Transducers, Active sensors, Imaging arrays, Wave plates

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Proceedings Article | 8 April 2009 Paper

Piezoelectric based sensing in wireless steel bridge health monitoring

Lingyu Yu, Victor Giurgiutiu, Paul Ziehl, Didem Ozevin

Proceedings Volume 7294, 72941D (2009) https://doi.org/10.1117/12.830128

KEYWORDS: Bridges, Sensors, Signal detection, Active remote sensing, Sensing systems, Damage detection, Inspection, Acoustic emission, Telecommunications, Semiconducting wafers

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Proceedings Article | 8 April 2009 Paper

Lamb wave dispersion compensation in piezoelectric wafer active sensor phased-array applications

Buli Xu, Lingyu Yu, Victor Giurgiutiu

Proceedings Volume 7295, 729516 (2009) https://doi.org/10.1117/12.816085

KEYWORDS: Dispersion, Wave propagation, Wave plates, Aluminum, Phased arrays, Computer simulations, Spatial resolution, Numerical simulations, Transducers, Signal processing

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Proceedings Article | 30 March 2009 Paper

Lamb waves decomposition and mode identification using matching pursuit method

Buli Xu, Victor Giurgiutiu, Lingyu Yu

Proceedings Volume 7292, 72920I (2009) https://doi.org/10.1117/12.816087

KEYWORDS: Associative arrays, Chemical species, Signal processing, Structural health monitoring, Fourier transforms, Time-frequency analysis, Interference (communication), Wave propagation, Wave plates, Denoising

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Proceedings Article | 30 March 2009 Paper

Thin-film active nano-PWAS for structural health monitoring

Bin Lin, Victor Giurgiutiu, Amar Bhalla, Chonglin Chen, Ruyan Guo, Jiechao Jiang

Proceedings Volume 7292, 72921M (2009) https://doi.org/10.1117/12.814397

KEYWORDS: Thin films, Structural health monitoring, Nickel, Electrodes, Ferroelectric materials, Interfaces, Semiconducting wafers, Sensors, Phased arrays, Active sensors

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Proceedings Article | 8 April 2008 Paper

A multi-mode sensing system for corrosion detection using piezoelectric wafer active sensors

Lingyu Yu, Victor Giurgiutiu, Patrick Pollock

Proceedings Volume 6932, 69322H (2008) https://doi.org/10.1117/12.776670

KEYWORDS: Corrosion, Wave plates, Active sensors, Ultrasonics, Waveguides, Semiconducting wafers, Structural health monitoring, Transducers, Aluminum, Sensors

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Proceedings Article | 19 April 2007 Paper

Ferroelectric thin-film active sensors for structural health monitoring

Bin Lin, Victor Giurgiutiu, Zheng Yuan, Jian Liu, Chonglin Chen, Jiechao Jiang, Amar Bhalla, Ruyan Guo

Proceedings Volume 6529, 65290I (2007) https://doi.org/10.1117/12.714862

KEYWORDS: Thin films, Active sensors, Structural health monitoring, Nickel, Semiconducting wafers, Transmission electron microscopy, Sensors, Dielectrics, Electrodes, Interfaces

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Proceedings Article | 11 April 2007 Paper

Analytical and experimental evaluation of piezoelectric wafer active sensors performances for Lamb waves based structural health monitoring in composite laminates

Giola Bottai, Nikos Chrysochoidis, Victor Giurgiutiu, Dimitris Saravanos

Proceedings Volume 6532, 65320N (2007) https://doi.org/10.1117/12.714970

KEYWORDS: Composites, Sensors, Dispersion, Wave propagation, Wave plates, Drug discovery, Active sensors, Structural health monitoring, Waveguides, Semiconducting wafers

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Proceedings Article | 10 April 2007 Paper

Lamb waves time-reversal method using frequency tuning technique for structural health monitoring

Buli Xu, Victor Giurgiutiu

Proceedings Volume 6529, 65290R (2007) https://doi.org/10.1117/12.715450

KEYWORDS: Wave plates, Structural health monitoring, Transducers, Waveguides, Wave propagation, Dispersion, Fourier transforms, Aluminum, Damage detection, Acoustics

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Proceedings Article | 10 April 2007 Paper

Finite element simulation of piezoelectric wafer active sensors for structural health monitoring with coupled-filed elements

Weiping Liu, Victor Giurgiutiu

Proceedings Volume 6529, 65293R (2007) https://doi.org/10.1117/12.715238

KEYWORDS: Finite element methods, Structural health monitoring, Sensors, Wave propagation, Optical simulations, Active sensors, Chemical elements, 3D modeling, Semiconducting wafers, Wave plates

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Crack detection with piezoelectric wafer active sensors (PWAS) is emerging as an effective and powerful technique in structural health monitoring (SHM). Modeling and simulation of PWAS and host structure play an important role in the SHM applications with PWAS. For decades finite element method has been extensively applied in the analysis of piezoelectric materials and structures. The advantage of finite element analysis over analytical solutions is that stress and electrical field measurements of complex geometries, and their variations throughout the device, are more readily calculated. FEM allows calculation of the stress and electric field distributions under static loads and under any applied electrical frequency, and so the effect of device geometry can be assessed and optimized without the need to manufacture and test numerous devices. Coupled field analysis taking both mechanical motions and electrical characteristics into account should all be employed to provide a systemic overview of the piezoelectric sensors/actuators (even arrays of them) and the host structures. This use of PWAS for SHM has followed two main paths: (a). Wave propagation (b). Electromechanical impedance; Previous research has shown that PWAS can detect damage using wave reflections, changes in wave signature, or changes in the electromechanical (E/M) impedance spectrum. The primary goal of this paper is to investigate the use of finite element method (FEM) to simulate various SHM methods with PWAS. For the simulation of Electro-mechanical (E/M) impedance technique, simple models, like free PWAS of different shapes and 1-dimmension beam with PWAS are investigated and the simulated structural E/M impedance was presented. For the wave propagation SHM technique, a long beam with several PWAS installed was studied. One PWAS is excited by tone burst signals and elastic wave will propagate along the beam. The existence of a crack will affect the structure integrity and the echo reflected by crack can be observed through the simulations. By using the coupled field elements, direct simulation of electro-mechanical interaction of the PWAS and the host structure was made possible. The electrical potential generated on the PWAS surface by the stimulation of elastic wave can be examined in our FEM analysis. The simulation results are then compared to analytical calculation and experimental data.

Proceedings Article | 10 April 2007 Paper

Omnidirectional guided wave PWAS phased array for thin-wall structure damage detection

Lingyu Yu, Victor Giurgiutiu, James Kendall

Proceedings Volume 6529, 652939 (2007) https://doi.org/10.1117/12.717738

KEYWORDS: Phased arrays, Damage detection, Waveguides, Aluminum, Wave plates, Ultrasonics, Image processing, Wave propagation, Wavefronts, Optical simulations

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Proceedings Article | 11 April 2006 Paper

Propagation of guided Lamb waves in bonded specimens using piezoelectric wafer active sensors

Adrian Cuc, Victor Giurgiutiu

Proceedings Volume 6174, 617416 (2006) https://doi.org/10.1117/12.658828

KEYWORDS: Sensors, Wave propagation, Aluminum, Ultrasonics, Waveguides, Wave plates, Transducers, Adhesives, Active sensors, Semiconducting wafers

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Proceedings Article | 11 April 2006 Paper

Finite element modeling and simulation of piezoelectric wafer active sensors interaction with the host structure for structural health monitoring

Weiping Liu, Victor Giurgiutiu

Proceedings Volume 6174, 61742Z (2006) https://doi.org/10.1117/12.658501

KEYWORDS: Structural health monitoring, Finite element methods, Sensors, Wave propagation, Optical simulations, Active sensors, 3D modeling, Semiconducting wafers, Chemical elements, Wave plates

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Crack detection with piezoelectric wafer active sensors (PWAS) is emerging as an effective and powerful technique in structural health monitoring (SHM). Modeling and simulation of PWAS and host structure play an important role in the SHM applications with PWAS. For decades finite element method has been extensively applied in the analysis of piezoelectric materials and structures. The advantage of finite element analysis over analytical solutions is that stress and electrical field measurements of complex geometries, and their variations throughout the device, are more readily calculated. FEM allows calculation of the stress and electric field distributions under static loads and under any applied electrical frequency, and so the effect of device geometry can be assessed and optimized without the need to manufacture and test numerous devices. Coupled field analysis taking both mechanical motions and electrical characteristics into account should all be employed to provide a systemic overview of the piezoelectric sensors/actuators (even arrays of them) and the host structures. This use of PWAS for SHM has followed two main paths: (a). Wave propagation (b). Electromechanical impedance; Previous research has shown that PWAS can detect damage using wave reflections, changes in wave signature, or changes in the electromechanical (E/M) impedance spectrum. The primary goal of this paper is to investigate the use of finite element method (FEM) to simulate various SHM methods with PWAS. For the simulation of Electro-mechanical (E/M) impedance technique, simple models, like free PWAS of different shapes and 1-dimmension beam with PWAS are investigated and the simulated structural E/M impedance was presented. For the wave propagation SHM technique, a long beam with several PWAS installed was studied. One PWAS is excited by tone burst signals and mechanical wave will propagate along the beam. The existence of a crack will affect the structure integrity and the echo reflected by crack can be observed through the simulations.

Proceedings Article | 5 April 2006 Paper

Design, implementation, and comparison of guided wave phased arrays using embedded piezoelectric wafer active sensors for structural health monitoring

Lingyu Yu, Victor Giurgiutiu

Proceedings Volume 6173, 61731M (2006) https://doi.org/10.1117/12.658649

KEYWORDS: Phased arrays, Waveguides, Inspection, Structural health monitoring, Optical simulations, Sensors, Wave propagation, Ultrasonics, Damage detection, Semiconducting wafers

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Phased array can interrogate large structural areas from a single location using ultrasonic guided waves generated by tuned piezoelectric wafer active sensors that are permanently attached (embedded) to the structure. Various array parameters determine the array beamforming and steering characteristics. This paper aims to bring up several one or two dimension array designs and research on their beamforming properties and damage detection performance through both analytical simulation and laboratory experiments. The paper will firstly present the generic guided wave phased array beamforming formulation and explain how the beamforming characteristics are affected by the array parameters such as number of elements, element spacing, and steering angle. Preliminary work of implementing a one dimensional linear phase array is then followed to exemplify how our embedded ultrasonic structural radar (EUSR) scans and detects damage on the plate structures. However, such a linear array has the limitations that it has limited scanning range due to the beamforming directionality deficiency and it can only scan the 0^o~180^o range either in front of or behind it, i.e., it can not tell if the damage is in the positive or negative direction in the polar coordinates. Hence, we proposed several improved array designs including: (1) a miniaturized array using smaller PWAS; (2) an array using rectangular PWAS; (3) a cross-shaped two dimensional array; (4) a L-shaped two dimensional array. Extensive simulation work has been done to explore the beamforming and beamsteering properties of those arrays. Laboratory experiments have also been conducted to testify the arrays damage detection abilities. The results show that the miniaturized array can look into larger area and be used for damage detection of compact specimen with complicated geometry. Signal rectangular PWAS has directional rather than omnidirectional beamforming which resulting in improved beamforming of the phased array using such PWAS. Two dimensional arrays show directional beamforming within full range of 0^o ~ 360^o degrees though having limited working steering angles. We finally end up with discussion and conclusion of the arrays and some expectations for future work.

Proceedings Article | 5 April 2006 Paper

On the modeling of piezoelectric wafer active sensor impedance analysis for structural health monitoring

Bin Lin, Victor Giurgiutiu

Proceedings Volume 6174, 61740A (2006) https://doi.org/10.1117/12.658521

KEYWORDS: Sensors, Finite element methods, Structural health monitoring, Electrodes, Semiconducting wafers, Active sensors, Transducers, Damage detection, Acoustics, Adhesives

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Proceedings Article | 5 April 2006 Paper

Modeling actuation forces and strains in nastic structures

Luke Matthews, Victor Giurgiutiu

Proceedings Volume 6173, 61731O (2006) https://doi.org/10.1117/12.658585

KEYWORDS: Actuators, Acquisition tracking and pointing, Proteins, Diffusion, Microfluidics, Water, Unmanned aerial vehicles, Tissues, Biomimetics, Molecules

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Nastic structures are capable of three dimensional shape change using biological principles borrowed from plant motion. The plant motor cells increase or decrease in size through a change in osmotic pressure. When nonuniform cell swelling occurs, it causes the plant tissue to warp and change shape, resulting it net movement, known as nastic motion, which is the same phenomena that causes plants to angle their broad leaf and flower surfaces to face light sources. The nastic structures considered in this paper are composed of a bilayer of microactuator arrays with a fluid reservoir in between the two layers. The actuators are housed in a thin plate and expand when water from the fluid reservoir is pumped into the actuation chamber through a phospholipid bilayer with embedded active transport proteins, which move the water from the low pressure fluid reservoir into a high pressure actuation chamber. Increasing water pressure inside the actuator causes lateral expansion and axial bulging, and the non-uniform net volume change of actuators throughout the nastic structure results in twisting or bending shape change. Modifying the actuation displacement allows controlled volume change. This paper presents an analytical model of the driving and blocking forces involved in actuation, as well as stress and strain that occurs due to the pressure changes. Actuation is driven by increasing osmotic pressure, and blocking forces are taken into consideration to plan actuator response so that outside forces do not counteract the displacement of actuation. Nastic structures are designed with use in unmanned aerial vehicles in mind, so blocking forces are modeled to be similar to in-flight conditions. Stress in the system is modeled so that any residual strain or lasting deformation can be determined, as well as a lifespan before failure from repeated actuation. The long-term aim of our work is to determine the power and energy efficiency of nastic structures actuation mechanism.

Proceedings Article | 5 April 2006 Paper

Development of DSP-based electromechanical (E/M) impedance analyzer for active structural health monitoring

Buli Xu, Victor Giurgiutiu

Proceedings Volume 6174, 61740S (2006) https://doi.org/10.1117/12.657507

KEYWORDS: Digital signal processing, Structural health monitoring, Data acquisition, Field programmable gate arrays, Analog electronics, Bandpass filters, Linear filtering, Clocks, Signal generators, Smoothing

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Proceedings Article | 15 March 2006 Paper

Development of piezoelectric oscillator sensor for in vivo monitoring of capsule formation around soft-tissue implants

Buli Xu, Victor Giurgiutiu, Gregory Crachiolo

Proceedings Volume 6177, 617715 (2006) https://doi.org/10.1117/12.657506

KEYWORDS: Oscillators, Tissues, Sensors, Amplifiers, In vivo imaging, Semiconducting wafers, Collagen, Active sensors, Silicon, Resistors

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Proceedings Article | 17 May 2005 Paper

Simulation of the Lamb wave interaction between piezoelectric wafer active sensors and host structure

Giola Bottai, Victor Giurgiutiu

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.597747

KEYWORDS: Aluminum, Transducers, Wave plates, Active sensors, Semiconducting wafers, Wave propagation, Structural health monitoring, Transmitters, Receivers, Fourier transforms

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Proceedings Article | 17 May 2005 Paper

Review of in situ fabrication methods of piezoelectric wafer active sensor for sensing and actuation applications

Bin Lin, Victor Giurgiutiu

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.597779

KEYWORDS: Composites, Ferroelectric polymers, Magnetism, Structural health monitoring, Ferroelectric materials, Sensors, Semiconducting wafers, Active sensors, Ceramics, Polymers

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Proceedings Article | 17 May 2005 Paper

Efficient electromechanical (E/M) impedance measuring method for active sensor structural health monitoring

Buli Xu, Victor Giurgiutiu

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.598174

KEYWORDS: Structural health monitoring, Digital signal processing, Signal processing, Data acquisition, Active sensors, Fourier transforms, Analytical research, Signal generators, Interference (communication), Semiconducting wafers

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Proceedings Article | 17 May 2005 Paper

Development of specifications for an integrated piezoelectric wafer active sensors system

Christopher Jenkins, Victor Giurgiutiu, Bin Lin, Weiping Liu

Proceedings Volume 5764, (2005) https://doi.org/10.1117/12.599877

KEYWORDS: Sensors, Semiconducting wafers, Switches, Transducers, Capacitance, Structural health monitoring, Ultrasonics, Active sensors, Waveguides, Oscilloscopes

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Proceedings Article | 17 May 2005 Paper

Automation of data collection for PWAS-based structural health monitoring

Weiping Liu, Victor Giurgiutiu

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.598200

KEYWORDS: Structural health monitoring, Switching, LabVIEW, Oscilloscopes, Relays, Signal generators, Switches, Transducers, Sensors, Connectors

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Proceedings Article | 17 May 2005 Paper

An initial investigation of the large strain and fatigue loading behavior of piezoelectric wafer active sensors

James Doane, Victor Giurgiutiu

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.599853

KEYWORDS: Semiconducting wafers, Aluminum, Structural health monitoring, Active sensors, Inspection, Adhesives, Epoxies, Sensors, Transducers, Failure analysis

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Proceedings Article | 9 May 2005 Paper

Multi-damage detection with embedded ultrasonic structural radar algorithm using piezoelectric wafer active sensors through advanced signal processing

Lingyu Yu, Victor Giurgiutiu

Proceedings Volume 5768, (2005) https://doi.org/10.1117/12.598186

KEYWORDS: Wavelets, Continuous wavelet transforms, Signal processing, Discrete wavelet transforms, Ultrasonics, Denoising, Fourier transforms, Sensors, Radar, Inspection

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Proceedings Article | 9 May 2005 Paper

Characterization of sensor performance and durability for structural health monitoring systems

James Blackshire, Victor Giurgiutiu, Adam Cooney, James Doane

Proceedings Volume 5770, (2005) https://doi.org/10.1117/12.599888

KEYWORDS: Sensors, Structural health monitoring, Digital imaging, Environmental sensing, Semiconducting wafers, Active sensors, Aluminum, Imaging systems, Sensor performance, System integration

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Proceedings Article | 29 July 2004 Paper

Development of a field-portable small-size impedance analyzer for structural health monitoring using the electromechanical impedance technique

Victor Giurgiutiu, Buli Xu

Proceedings Volume 5391, (2004) https://doi.org/10.1117/12.541343

KEYWORDS: Structural health monitoring, Signal processing, Digital signal processing, Fourier transforms, Data acquisition, Interference (communication), Software development, Resistors, Semiconducting wafers, Active sensors

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Proceedings Article | 29 July 2004 Paper

Signal processing techniques for damage detection with piezoelectric wafer active sensors and embedded ultrasonic structural radar

Lingyu Yu, Jingjing Bao, Victor Giurgiutiu

Proceedings Volume 5391, (2004) https://doi.org/10.1117/12.540512

KEYWORDS: Signal processing, Sensors, Denoising, Ultrasonics, Continuous wavelet transforms, Radar, Discrete wavelet transforms, Wavelets, Interference (communication), Signal detection

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Proceedings Article | 21 July 2004 Paper

Corrosion damage detection with piezoelectric wafer active sensors

Dustin Thomas, John Welter, Victor Giurgiutiu

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.541152

KEYWORDS: Corrosion, Wave plates, Signal attenuation, Semiconducting wafers, Active sensors, Transducers, Aluminum, Damage detection, Waveguides, Composites

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Since today's aging fleet is intended to far exceed their proposed design life, monitoring the structural integrity of those aircraft has become a priority issue for today's Air Force. One of the most critical structural problems is corrosion. In fact the KC-135 now costs $1.2 billion a year to repair corrosion. In this paper, we plan to show the use of Lamb waves to detect material loss in thin plates representative of aircraft skins. To do this we will use embedded transducers called Piezoelectric Wafer Active Sensor (PWAS) in a pitch-catch configuration. The sensors were placed on a grid pattern. Material loss through corrosion was simulated by removing the material mechanically with an abrasive tool. Thus, simulated corrosion pits of various depths and area coverage were made. Three-count tone burst wave packets were used. The Lamb wave packets were sent in a pitch-catch mode from one transmitter PWAS to the other PWAS in the grid acting as receivers. The Lamb wave mode used in these experiments was A₁, since this was found to be more sensitive to changes due to material loss. At the frequencies considered in our experiments, the A₁ waves are highly dispersive. It was found that, as the Lamb wave travels through simulated corrosion damage, the signal changes. The observed changes were in the signal wavelength (due to change in the dispersive properties of the medium) and in signal amplitude (due to redistribution of energy in the wave packet). This change in signal can be correlated to the magnitude of damage. To achieve this, we have used several approaches: (a) direct correlation between the sent and the received signals; (b) wavelet transform of the signal followed by correlation of the wavelet coefficients time-frequency maps; (c) Hilbert transform of the signal to produce the signal envelope and comparison of the resulting envelope signals (d) neural network correlation between the sent and received signals. It was found that these methods work well together in a complementary way.

Proceedings Article | 21 July 2004 Paper

Disbond detection in adhesively bonded structures using piezoelectric wafer active sensors

Adrian Cuc, Victor Giurgiutiu

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.540358

KEYWORDS: Sensors, Ultrasonics, Active sensors, Adhesives, Wave propagation, Signal attenuation, Semiconducting wafers, Inspection, Waveguides, Nondestructive evaluation

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Proceedings Article | 16 February 2004 Paper

In situ fabricated smart material active sensors for structural health monitoring

Victor Giurgiutiu, Bin Lin

Proceedings Volume 5648, (2004) https://doi.org/10.1117/12.582146

KEYWORDS: Composites, Magnetism, Structural health monitoring, Active sensors, Sensors, Ceramics, Ferroelectric materials, Particles, Epoxies, Semiconducting wafers

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Proceedings Article | 5 August 2003 Paper

Lamb wave generation with piezoelectric wafer active sensors for structural health monitoring

Victor Giurgiutiu

Proceedings Volume 5056, (2003) https://doi.org/10.1117/12.483492

KEYWORDS: Ultrasonics, Sensors, Active sensors, Transducers, Wave plates, Structural health monitoring, Nondestructive evaluation, Phased arrays, Semiconducting wafers, Wave propagation

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Proceedings Article | 1 August 2003 Paper

Comparative study of neural network damage detection from a statistical set of electro-mechanical impedance spectra

Victor Giurgiutiu, Claudia Kropas-Hughes

Proceedings Volume 5047, (2003) https://doi.org/10.1117/12.484050

KEYWORDS: Neural networks, Damage detection, Neurons, Pattern recognition, Evolutionary algorithms, Feature extraction, Calibration, Statistical analysis, Artificial neural networks, Prototyping

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Proceedings Article | 11 June 2002 Paper

Current issues in vibration-based fault diagnostics and prognostics

Victor Giurgiutiu

Proceedings Volume 4702, (2002) https://doi.org/10.1117/12.469869

KEYWORDS: Diagnostics, Near field, Sensors, Charge-coupled devices, Feature extraction, Neural networks, Calibration, Active sensors, Signal processing, Silicon

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Proceedings Article | 11 June 2002 Paper

Health monitoring of aging aerospace structures using the electromechanical impedance method

Andrei Zagrai, Victor Giurgiutiu

Proceedings Volume 4702, (2002) https://doi.org/10.1117/12.469888

KEYWORDS: Sensors, Near field, Ferroelectric materials, Active sensors, Charge-coupled devices, Aerospace engineering, Structural dynamics, Structural health monitoring, Feature extraction, Neural networks

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Proceedings Article | 16 August 2001 Paper

Modeling and characterization of piezoelectric and magnetostrictive induced-strain actuators

Victor Giurgiutiu, Radu Pomirleanu

Proceedings Volume 4327, (2001) https://doi.org/10.1117/12.436569

KEYWORDS: Actuators, Data modeling, Oscilloscopes, Transducers, Smart materials, Surface plasmons, Data processing, Resistors, Amplifiers, Electrodes

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Proceedings Article | 16 August 2001 Paper

Active sensor wave propagation health monitoring of beam and plate structures

Victor Giurgiutiu, JingJing Bao, Wei Zhao

Proceedings Volume 4327, (2001) https://doi.org/10.1117/12.436535

KEYWORDS: Wave propagation, Active sensors, Ferroelectric materials, Transducers, Semiconducting wafers, Wave plates, Sensors, Particles, Aluminum, Ultrasonics

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Proceedings Article | 24 July 2001 Paper

Electro-mechanical impedance method for crack detection in metallic plates

Victor Giurgiutiu, Andrei Zagrai

Proceedings Volume 4335, (2001) https://doi.org/10.1117/12.434167

KEYWORDS: Sensors, Ferroelectric materials, Active sensors, Semiconducting wafers, Aluminum, Nondestructive evaluation, Structural dynamics, Bessel functions, Modal analysis, Actuators

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Proceedings Article | 22 June 2000 Paper

Use of smart materials technologies in radiation environments and nuclear industry

Victor Giurgiutiu, Andrei Zagrai

Proceedings Volume 3985, (2000) https://doi.org/10.1117/12.388812

KEYWORDS: Shape memory alloys, Smart materials, Sensors, Fiber optics, Ferroelectric materials, Optical fibers, Fiber optics sensors, Resonators, Signal attenuation, Resistance

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Proceedings Article | 22 June 2000 Paper

Active sensors for health monitoring of aging aerospace structures

Victor Giurgiutiu, James Redmond, Dennis Roach, Kirk Rackow

Proceedings Volume 3985, (2000) https://doi.org/10.1117/12.388833

KEYWORDS: Active sensors, Sensors, Wave propagation, Ultrasonics, Corrosion, Aerospace engineering, Damage detection, Ferroelectric materials, Structural health monitoring, Transducers

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Proceedings Article | 9 June 1999 Paper

Structural health monitoring using active sensors and wavelet transforms

Xiaomin Deng, Quan Wang, Victor Giurgiutiu

Proceedings Volume 3668, (1999) https://doi.org/10.1117/12.350715

KEYWORDS: Sensors, Wavelet transforms, Wavelets, Wave propagation, Transducers, Composites, Active sensors, Detection theory, Structural health monitoring, Signal analyzers

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Proceedings Article | 9 June 1999 Paper

Details of the electromechanical (E/M) impedance health monitoring of spot-welded structural joints

Victor Giurgiutiu, Anthony Reynolds, Craig Rogers

Proceedings Volume 3668, (1999) https://doi.org/10.1117/12.350714

KEYWORDS: Transducers, Ferroelectric materials, Nondestructive evaluation, Aluminum, Damage detection, Semiconducting wafers, Adhesives, Chlorine, Structural health monitoring, Mechanical engineering

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Proceedings Article | 18 May 1999 Paper

Application of smart materials/technology at the Savannah River site

Kerry Dunn, McIntyre Louthan, Natraj Iyer, Victor Giurgiutiu, Michael Petrou, Dorothy Laub

Proceedings Volume 3671, (1999) https://doi.org/10.1117/12.348690

KEYWORDS: Bridges, Sensors, Composites, Fiber reinforced polymers, Ferroelectric materials, Transducers, Smart materials, Inspection, Polymers, Ferroelectric polymers

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Proceedings Article | 27 July 1998 Paper

Recent advancements in the electromechanical (E/M) impedance method for structural health monitoring and NDE

Victor Giurgiutiu, Craig Rogers

Proceedings Volume 3329, (1998) https://doi.org/10.1117/12.316923

KEYWORDS: Transducers, Composites, Semiconducting wafers, Nondestructive evaluation, Ferroelectric materials, Sensors, Polymers, Damage detection, Inspection, Structural health monitoring

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The emerging electro-mechanical impedance technology has high potential for in-situ health monitoring and NDE of structural systems and complex machinery. At first, the fundamental principles of the electro-mechanical impedance method are briefly reviewed and ways for practical implementation are highlighted. The equations of piezo- electric material response are given, and the coupled electro-mechanical impedance of a piezo-electric wafer transducer as affixed to the monitored structure is discussed. Due to the high frequency operation of this NDE method, wave propagation phenomena are identified as the primary coupling method between the structural substrate and the piezo-electric wafer transducer. Attention is then focused on several recent advancements that have extended the electro-mechanical impedance method into new areas of applications and/or have developed its underlying principles. US Army Construction Engineering Research Laboratory used the electro-mechanical impedance method to monitor damage development in composite overlaid civil infrastructure specimens under full-scale static testing. A simplified E/M impedance measuring technique was employed at the Polytechnic University of Madrid, Spain, to detect damage in GFRP composite specimens. The development of miniaturized `bare-bones' impedance analyzer equipment that could be easily packaged into transponder-size dimensions is being studied at the University of South Carolina. US Army Research Laboratory developed novel piezo-composite film transducers for embedment into composite structures. Disbond gauges for monitoring the structural joints of adhesively bonded rotor blades have been studies in the Mechanical Engineering Department at the University of South Carolina. These recent developments accentuate the importance and benefits of using the electro-mechanical impedance method for on-line health monitoring and damage detection in a variety of applications. Further investigation of the electro-mechanical impedance method is warranted. A further examination of the complex interaction between wave propagation, drive-point impedance, structural damage and electro-mechanical impedance of the piezo-electric wafer transducer is needed. Once these aspects are better understood, the E/M impedance method has the potential to become a widely used NDE technique with large applicability in diverse engineering fields (aerospace, automotive, infrastructure and biomedical implants).

Proceedings Article | 6 June 1997 Paper

Large-amplitude rotary induced-strain (LARIS) actuator proof-of-concept demonstrator

Victor Giurgiutiu, Craig Rogers, Shane McNeil

Proceedings Volume 3041, (1997) https://doi.org/10.1117/12.275668

KEYWORDS: Actuators, Ferroelectric materials, Solid state physics, Solid state electronics, Amplifiers, Transducers, Intelligence systems, Composites, Information technology, Oscilloscopes

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Induced-strain materials can produce very large forces and, hence, large energy density, but small actual displacements. A new concept for obtaining large-amplitude rotary displacements from small linear displacements generated by induced-strain material stacks is proposed. The concept utilizes the theory of twist-warping coupling in thin-wall open tubes. The theory of the proposed solid-state axial-to- rotary converter-amplifier, together with the appropriate bibliographical references, is given. A simple formula is generated for estimating the axial-to-rotary conversion- amplification coefficient from the geometrical length, L, and enclosed area, A, of the open tube. A large-displacement induced-strain rotary (LARIS) actuator proof-of-concept demonstrator was built and tested to verify and validate the theoretical developments. The LARIS actuator consisted of a 28 mm diameter, 1.2 m length open tube and a 120 micrometer, -1000 V PZT translator. The experimental set-up and the excitation and measuring equipment are fully described in the paper. A maximum rotary displacement of 8 degrees was measured, and the linear relationship between the rotation coefficient, the tube length, L, and the inverse of the enclosed area, A, was verified. An improved theoretical model, that accounts for the experimentally observed zero off-set, is also given. The theoretical developments and experimental tests presented in this paper show that the proposed LARIS actuator, based on a novel solid-state axial-to-rotary converter-amplifier utilizing the warping-torsion coupling of an open tube, is a viable design option, of great constructive simplicity and very low parts count. This concept can be successfully used in a series of aerospace and mechanical engineering applications, as for example in the actuation of adaptive control surfaces for aircraft wings and helicopter blades. The 8 degree rotary displacement capabilities measured on the proof-of-concept demonstrator can be easily scaled to other values to meet the operation requirements of specific applications. For very large angles (40 - 50 degrees), conventional electromechanical actuators (e.g., stepper-motors and ball-screws assemblies) can used.

Proceedings Article | 6 June 1997 Paper

Design and preliminary tests of an SMA active composite tab

Victor Giurgiutiu, Craig Rogers, Jasper Zuidervaart

Proceedings Volume 3041, (1997) https://doi.org/10.1117/12.275647

KEYWORDS: Photography, Shape memory alloys, Composites, Polymers, Erbium, Transducers, Temperature metrology, Data acquisition, Curium, Data processing

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Proceedings Article | 23 May 1997 Paper

Full-scale ferromagnetic active tagging testing of C-channel composite elements

Zao Chen, Harley Cudney, Victor Giurgiutiu, Craig Rogers, Robert Quattrone, Justin Berman

Proceedings Volume 3043, (1997) https://doi.org/10.1117/12.274640

KEYWORDS: Composites, Inspection, Neurons, Magnetism, Nondestructive evaluation, Electromagnetism, Neural networks, Particles, Signal processing, Ferromagnetics

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This paper presents the work we have done on a health monitoring technique called active non-destructive evaluation (ANDE) for detecting delaminations in full-scale C-channel structural elements of glass-fiber reinforced polymer (GFRP) composites using active ferromagnetic tagging. Conventional non-destructive evaluation methods are not very effective in monitoring the material conditions of GFRP composite and adhesive joints. A technology that has been proposed to enhance inspection of such non-conductive and non-magnetic GFRP composites is the particle tagging technique. This technique, previously demonstrated on small scale laboratory samples is being developed for full-scale C-channel composite elements. This technique relies on comparing changes in local-area mechanical properties of the structure to identify delaminations. Unlike conventional passive tagging NDE inspection, our technique uses an electromagnetic exciter to interrogate tagged composites over a broad frequency range. As the vibration excitation approaches the resonant frequency of the area of the disbondment, the response amplitude obtained for a given force input increases. Therefore, at frequencies around the transverse resonance of the layer above a defect, the response for a given force will be greater than the response in flawless regions of the structure. Thus, the ANDE test may be based on response measurements alone. The technique is most sensitive if excitation is applied at the plate resonant frequency. Since this frequency is dependent on defect size and depth, a broad band of frequencies must be covered. A laser Doppler vibrometer is a high-sensitivity, high-speed and non-contacting instrument used for detecting surface vibrations. The frequency response curves are obtained using a fast Fourier transform signal processor. An algorithm based on training a neural network to detect significant differences between healthy and damaged structures is then applied to recognize delaminations in full scale structural elements. This method provides the fundamental technology needed for developing a commercial system to monitor the integrity of composite structures, both during manufacturing and during their lifetime as structural elements.

Proceedings Article | 14 February 1997 Paper

Manufacturing and characterization of magnetorheological fluids

Osama Ashour, Dawn Kinder, Victor Giurgiutiu, Craig Rogers

Proceedings Volume 3040, (1997) https://doi.org/10.1117/12.267112

KEYWORDS: Particles, Magnetism, Liquids, Manufacturing, Iron, Chromium, Solids, Fluid dynamics, Silica, Ferromagnetics

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Proceedings Article | 1 May 1996 Paper

Passive and active tagging of reinforced composites for in-process and in-field nondestructive evaluation

Victor Giurgiutiu, Zao Chen, Frederic Lalande, Craig Rogers, Robert Quattrone, Justin Berman

Proceedings Volume 2717, (1996) https://doi.org/10.1117/12.239040

KEYWORDS: Particles, Composites, Magnetism, Nondestructive evaluation, Inspection, Iron, Reflectivity, Polymers, Civil engineering, Ferromagnetics

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Proceedings Article | 1 May 1996 Paper

Comparison of solid state actuators based on power and energy criteria

Victor Giurgiutiu, Craig Rogers

Proceedings Volume 2717, (1996) https://doi.org/10.1117/12.239032

KEYWORDS: Actuators, Solid state physics, Mechanical efficiency, Energy efficiency, Ferroelectric materials, Manufacturing, Solid state electronics, Energy conversion efficiency, Data conversion, Dielectrics

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Proceedings Article | 8 May 1995 Paper

Stiffness issues in the design of ISA displacement amplification devices: case study of a hydraulic displacement amplifier

Victor Giurgiutiu, Zaffir Chaudhry, Craig Rogers

Proceedings Volume 2443, (1995) https://doi.org/10.1117/12.208250

KEYWORDS: Actuators, Kinematics, Silicon, Amplifiers, Resistance, Smart structures, Energy transfer, Vibration control, Instrument modeling, Modulation

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Proceedings Article | 5 May 1995 Paper

Individual feedforward-feedback control of a flexible rotor blade: a comparison of approaches

Leslie Fowler, Daniel Cole, Harry Robertshaw, Victor Giurgiutiu

Proceedings Volume 2442, (1995) https://doi.org/10.1117/12.208861

KEYWORDS: Feedback control, Control systems, Aerodynamics, Mechanical engineering, Performance modeling, Intelligence systems, Systems modeling, Mathematical modeling, Matrices, Defense and security

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Proceedings Article | 13 September 1994 Paper

Efficient use of induced strain actuators in aeroelastic active control

Victor Giurgiutiu, Zaffir Chaudhry, Craig Rogers

Proceedings Volume 2361, (1994) https://doi.org/10.1117/12.184843

KEYWORDS: Actuators, Energy efficiency, Dynamical systems, Intelligence systems, Phase shifts, Smart materials, Mechanics, Radium, Sun, Wave propagation

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Proceedings Article | 6 May 1994 Paper

Engineering feasibility of induced-strain actuators for rotor blade active vibration control

Victor Giurgiutiu, Zaffir Chaudhry, Craig Rogers

Proceedings Volume 2190, (1994) https://doi.org/10.1117/12.175175

KEYWORDS: Actuators, Aerodynamics, Ferroelectric materials, Control systems, Vibration control, Amplifiers, Energy efficiency, Active vibration control, Composites, Modulation

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Showing 5 of 109 publications

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SPIE Conference Volume | 29 March 2011

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011

SPIE Conference Volume | 31 March 2010

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010

SPIE Conference Volume | 30 March 2009

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009

SPIE Conference Volume | 7 May 2008

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008

SPIE Conference Volume | 5 April 2007

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007

Showing 5 of 7 publications

Conference Committee Involvement (60)

Health Monitoring of Structural and Biological Systems XIX

17 March 2025 | Vancouver, Canada

Active and Passive Smart Structures and Integrated Systems XIX

17 March 2025 | Vancouver, Canada

Active and Passive Smart Structures and Integrated Systems XVIII

25 March 2024 | Long Beach, California, United States

Health Monitoring of Structural and Biological Systems XVIII

25 March 2024 | Long Beach, California, United States

Health Monitoring of Structural and Biological Systems XVII

13 March 2023 | Long Beach, California, United States

Active and Passive Smart Structures and Integrated Systems XVII

13 March 2023 | Long Beach, California, United States

Active and Passive Smart Structures and Integrated Systems XVI

7 March 2022 | Long Beach, California, United States

Health Monitoring of Structural and Biological Systems XVI

7 March 2022 | Long Beach, California, United States

Active and Passive Smart Structures and Integrated Systems XV

8 March 2021 | Online Only, California, United States

Health Monitoring of Structural and Biological Systems XV

8 March 2021 | Online Only, California, United States

Health Monitoring of Structural and Biological Systems XIV

27 April 2020 | Online Only, California, United States

Active and Passive Smart Structures and Integrated Systems XIV

27 April 2020 | Online Only, California, United States

Active and Passive Smart Structures and Integrated Systems XIII

4 March 2019 | Denver, Colorado, United States

Health Monitoring of Structural and Biological Systems XIII

4 March 2019 | Denver, Colorado, United States

Active and Passive Smart Structures and Integrated Systems XII

5 March 2018 | Denver, Colorado, United States

Health Monitoring of Structural and Biological Systems XII

5 March 2018 | Denver, Colorado, United States

Active and Passive Smart Structures and Integrated Systems XI

26 March 2017 | Portland, Oregon, United States

Health Monitoring of Structural and Biological Systems XI

26 March 2017 | Portland, Oregon, United States

Active and Passive Smart Structures and Integrated Systems X

21 March 2016 | Las Vegas, Nevada, United States

Health Monitoring of Structural and Biological Systems X

21 March 2016 | Las Vegas, Nevada, United States

Active and Passive Smart Structures and Integrated Systems IX

9 March 2015 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems IX

9 March 2015 | San Diego, California, United States

SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring

8 March 2015 | San Diego, United States

Active and Passive Smart Structures and Integrated Systems VIII

10 March 2014 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems VIII

10 March 2014 | San Diego, California, United States

SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring

9 March 2014 | San Diego, United States

Health Monitoring of Structural and Biological Systems VII

11 March 2013 | San Diego, California, United States

Active and Passive Smart Structures and Integrated Systems VII

10 March 2013 | San Diego, California, United States

SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring

10 March 2013 | San Diego, United States

Health Monitoring of Structural and Biological Systems VI

12 March 2012 | San Diego, California, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

12 March 2012 | San Diego, California, United States

Active and Passive Smart Structures and Integrated Systems VI

12 March 2012 | San Diego, California, United States

SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring

11 March 2012 | San Diego, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

7 March 2011 | San Diego, California, United States

Active and Passive Smart Structures and Integrated Systems V

7 March 2011 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems V

7 March 2011 | San Diego, California, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

8 March 2010 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems IV

8 March 2010 | San Diego, California, United States

Active and Passive Smart Structures and Integrated Systems IV

8 March 2010 | San Diego, California, United States

Second International Conference on Smart Materials and Nanotechnology in Engineering

8 July 2009 | Weihai, China

Health Monitoring of Structural and Biological Systems III

9 March 2009 | San Diego, California, United States

Active and Passive Smart Structures and Integrated Systems III

9 March 2009 | San Diego, California, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

9 March 2009 | San Diego, California, United States

Active and Passive Smart Structures and Integrated Systems II

10 March 2008 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems II

10 March 2008 | San Diego, California, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

10 March 2008 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems

19 March 2007 | San Diego, California, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

19 March 2007 | San Diego, California, United States

Active and Passive Smart Structures and Integrated Systems

19 March 2007 | San Diego, California, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

27 February 2006 | San Diego, California, United States

Smart Structures and Integrated Systems

27 February 2006 | San Diego, California, United States

Health Monitoring and Smart NDE of Structural and Biological Systems V

27 February 2006 | San Diego, CA, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

7 March 2005 | San Diego, California, United States

Smart Structures and Integrated Systems

7 March 2005 | San Diego, California, United States

Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems IV

7 March 2005 | San Diego, CA, United States

Smart Materials III

13 December 2004 | Sydney, Australia

Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III

15 March 2004 | San Diego, CA, United States

Smart Structures and Integrated Systems

15 March 2004 | San Diego, CA, United States

Smart Structures and Integrated Systems

3 March 2003 | San Diego, California, United States

Smart Nondestructive Evaluation and Health Monitoring of Structural and Biological Systems

3 March 2003 | San Diego, California, United States

Showing 5 of 60 Conference Committees

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