Experimental study on the propagation characteristics of laser-induced Lamb waves based on frequency-wavenumber analysis
LIU Zenghua1,2 FENG Xuejian1,2 REN Jie1,2 WANG Shuangquan1,2 HE Cunfu1,2 WU Bin1,2
1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China;
2. Beijing Engineering Research Center of Precision Measurement Technology and Instruments, Beijing University of Technology, Beijing 100124, China
Abstract:It is difficult to realize the quantitative detection of defects by using the time domain or frequency domain features of Lamb wave signals due to their dispersion and multi-mode characteristics. This paper proposes a method for analyzing the propagation characteristics of laser-induced Lamb waves in frequency-wavenumber domain. Based on a full-optical laser ultrasonic testing system, time-space wavefield signals were obtained by the pulse laser excitation in a fixed location and continuous laser acquisition with one-dimensional scanning, where the propagation characteristics of laser-induced Lamb wave signals and the regular pattern of the interaction between the laser-induced Lamb wave signal and the defect can be visually displayed. The two-dimensional Fourier transform was used to convert the wavefield signals from the time-space domain to the frequency-wavenumber domain where individual modes including in the signals are well discernible. Based on the idea of short-time Fourier transform, for retaining the space information, a short-space two-dimensional Fourier transform was adopted to obtain the distribution of wavenumber along the scanning path, by which the location of the defect can be visually displayed. The results of short-space two-dimensional Fourier transform were optimized by using band-pass filtering combined with continuous wavelet transform. The experiments performed on pristine and defected aluminum plates respectively confirm the effectiveness of the method.
刘增华1,2 冯雪健1,2 任捷1,2 王双全1,2 何存富1,2 吴斌1,2. 基于频率-波数分析的激光Lamb波传播特性实验研究[J]. 振动与冲击, 2019, 38(22): 70-78.
LIU Zenghua1,2 FENG Xuejian1,2 REN Jie1,2 WANG Shuangquan1,2 HE Cunfu1,2 WU Bin1,2. Experimental study on the propagation characteristics of laser-induced Lamb waves based on frequency-wavenumber analysis. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(22): 70-78.
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