An Efficient Time Reversal Method for Lamb Wave-Based Baseline-Free Damage Detection in Composite Laminates

Applied Sciences

卷:9

Junmin Du¹  Feiyu Chen¹  Liping Huang²  Liang Zeng² 

[1] Henan Key Laboratory of Underwater Intelligent Equipment, 713th Research Institute of China Shipbuilding Industry Corporation, Zhengzhou 450015, China;

[2] School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;

关键词: Lamb waves;    time reversal;    baseline-free;    composite laminates;   

DOI  :  10.3390/app9010011

来源: DOAJ

【 摘 要 】

Time reversal (TR) concept is widely used for Lamb wave-based damage detection. However, the time reversal process (TRP) faces the challenge that it requires two actuating-sensing steps and requires the extraction of re-emitted and reconstructed waveforms. In this study, the effects of the two extracted components on the performance of TRP are studied experimentally. The results show that the two time intervals, in which the waveforms are extracted, have great influence on the accuracy of damage detection of the time reversal method (TRM). What is more, it requires a large number of experiments to determine these two time intervals. Therefore, this paper proposed an efficient time reversal method (ETRM). Firstly, a broadband excitation is applied to obtain response at a wide range of frequencies, and ridge reconstruction based on inverse short-time Fourier transform is applied to extract desired mode components from the broadband response. Subsequently, deconvolution is used to extract narrow-band reconstructed signal. In this method, the reconstructed signal can be easily obtained without determining the two time intervals. Besides, the reconstructed signals related to a series of different excitations could be obtained through only one actuating-sensing step. Finally, the effectiveness of the ETRM for damage detection in composite laminates is verified through experiments.

【 授权许可】

Unknown