Damage location of two-dimensional structure based on wavelet transform and active monitoring technology of Lamb wave

Ge Peng; Shen-fang Yuan; Ying-Di Xu

doi:10.1117/12.539422

20 July 2004 Damage location of two-dimensional structure based on wavelet transform and active monitoring technology of Lamb wave

Ge Peng, Shen-fang Yuan, Ying-Di Xu

Author Affiliations +

Proceedings Volume 5393, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites III; (2004) https://doi.org/10.1117/12.539422
Event: NDE for Health Monitoring and Diagnostics, 2004, San Diego, CA, United States

Abstract

This paper presents an active monitoring method based on Lamb wave and wavelet transform to determine damage locations. The method compares damage signal with reference signal, namely undamage signal, and takes their algebraic difference as a signal caused by damage. In fact, by the analysis of Lamb wave signals recorded before and after damage, the differential signal is a reflect signal from damage which can be regarded as an acoustic emission signal. It is showed that the wavelet transform using the Gabor wavelet effectively decomposes the differential signal into its time-frequency components, and the peaks of the time-frequency distribution near the center frequency of exciting signal indicate the arrival times of waves. By calculation of time delays between the arrival of the differential and exciting signals, the damage localization points can be obtained. Our experimental results on fiber-glass materials which suffer a delamination defect prove that the damage location is reliable.

Citation Download Citation

Ge Peng, Shen-fang Yuan, and Ying-Di Xu "Damage location of two-dimensional structure based on wavelet transform and active monitoring technology of Lamb wave", Proc. SPIE 5393, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites III, (20 July 2004); https://doi.org/10.1117/12.539422

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