Detecting damage through the application of a CWT-based algorithm

Stephanie A. Wimmer; Virginia G. DeGiorgi

doi:10.1117/12.539130

21 July 2004 Detecting damage through the application of a CWT-based algorithm

Stephanie A. Wimmer, Virginia G. DeGiorgi

Proceedings Volume 5394, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III; (2004) https://doi.org/10.1117/12.539130
Event: NDE for Health Monitoring and Diagnostics, 2004, San Diego, CA, United States

Abstract

Structural health monitoring systems consist of a method to measure the structure's performance at a given point in time and a means to interpret the measured raw data in terms of presence and location of damage. This work focuses on the interpretation of the measured raw data. The concept of structural health monitoring that this work supports is a multi-stage damage identification system where the first, or screening, stage is used to indicate when further inspection is necessary, prior to the degradation of structural parameters. Finding low levels of damage is important for this screening stage. This paper describes the application of a previously presented wavelet based algorithm to detect relatively low levels of structural damage. Typically strain sensor data is used in the algorithm. However, the algorithm does not depend on a specific type of data (strain, stress, displacement, etc.), the conditions (load, boundary, etc.) under which the data was acquired, or the geometry of the structure. The structures examined in this paper are steel plates. Sensor data is either obtained from experimentation or finite element models. In the case of finite element analyses, sensor data in the form of non-linear time histories is extracted, thus producing the equivalent of raw sensor data. The wavelet based algorithm makes use of the continuous wavelet transformation and examines how this feature changes as damage accumulates.

Citation Download Citation

Stephanie A. Wimmer and Virginia G. DeGiorgi "Detecting damage through the application of a CWT-based algorithm", Proc. SPIE 5394, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III, (21 July 2004); https://doi.org/10.1117/12.539130

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available