Wideband excitation in nonlinear vibro-acoustic modulation for damage detection

A. Klepka; M. Adamczyk; L. Pieczonka; W. J. Staszewski

doi:10.1117/12.2218805

1 April 2016 Wideband excitation in nonlinear vibro-acoustic modulation for damage detection

A. Klepka, M. Adamczyk, L. Pieczonka, W. J. Staszewski

Proceedings Volume 9805, Health Monitoring of Structural and Biological Systems 2016; 980513 (2016) https://doi.org/10.1117/12.2218805
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2016, Las Vegas, Nevada, United States

Abstract

The paper discusses the use of wideband excitation in nonlinear vibro-acoustic modulation technique (VAM) used for damage detection. In its original form, two mono-harmonic signals (low and high frequency) are used for excitation. The low frequency excitation is typically selected based on a modal analysis test and high frequency excitation is selected arbitrarily in the ultrasonic frequency range. This paper presents a different approach with use of wideband excitation signals. The proposed approach gives the possibility to simplify the testing procedure by omitting the modal test used to determine the value of low frequency excitation. Simultaneous use of wideband excitation for high frequency solves the ambiguity related to the selection of the frequency of acoustic wave. Broadband excitation signals require, however, more elaborate signal processing methods to determine the intensity of modulation for a given bandwidth. The paper discusses the proposed approach and the related signal processing procedure. Experimental validation of the proposed technique is performed on a laminated composite plate with a barely visible impact damage that was generated in an impact test. Piezoceramic actuators are used for vibration excitation and a scanning laser vibrometer is used for noncontact data acquisition.

Citation Download Citation

A. Klepka, M. Adamczyk, L. Pieczonka, and W. J. Staszewski "Wideband excitation in nonlinear vibro-acoustic modulation for damage detection", Proc. SPIE 9805, Health Monitoring of Structural and Biological Systems 2016, 980513 (1 April 2016); https://doi.org/10.1117/12.2218805

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