| Citation: | YUAN Mei, SHANG Fukai, DONG Shaopenget al. Acoustic emission source location for composite plate based on empirical wavelet transform[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(7): 1395-1401. doi: 10.13700/j.bh.1001-5965.2017.0527(in Chinese)
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Acoustic emission (AE) technique is a non-destructive damage test method. It can be used to monitor the dynamic defects of composite structures in aircraft. The complex components of AE signal and the anisotropy of composite materials lead to the low positioning accuracy of the source. A method of time difference of arrival (TDOA) based on empirical wavelet transform (EWT) and generalized cross-correlation (GCC) is proposed to improve the location accuracy of AE source. EWT is used to adaptively decompose and reconstruct the AE signals observed by sensors. The dominant frequency modes are obtained and the correlation coefficients between signals in each channel are effectively increased. The wave velocity is polynomial fitted by the multidirectional wave velocity measurement experiment. Then the AE source is located by using GCC method to estimate the time difference of each channel. Experiments are conducted on a T800 carbon fiber composite plate with the signal of lead break as simulating source. The experimental results show the accuracy and practicability of the proposed algorithm.
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