Application of Hilbert-Huang Transform to Eztract Arrival Time of Ultrasonic Lamb Waves
Hilbert-Huang transform (HHT) is applied to multi-mode arrival time estimation from Lamb waveforms. The method consists of two parts: (1) the empirical mode decomposition (EMD), and (2) Hilbert transform. The key part of the method is the first step, the EMD, with which, the complicated Lamb waves can be decomposed into number of intrinsic mode functions (IMF), which admit well-behaved Hilbert transforms. Because the decomposition is based on the local characteristic time scale of the signal, it is applicable to arrival time extraction of Lamb waves. Comparisons with the peak envelope of the original signal, direct Hilbert transform (HT) envelope and wavelet envelope show the new method offers higher temporal resolutions in extracting arrival times of multiple Lamb wave modes.
Haiyan Zhang Xuerui Qi Xiuli Sun Shixuan Fan
School of Communication and Information Engineering, Shanghai University, Shanghai, China
国际会议
2008 International Conference on Audio，Language and Image Processing(2008国际声音、语言、图像过程大会)
镇江
英文
1-4
2008-07-07（万方平台首次上网日期，不代表论文的发表时间）