中国物理B ›› 2017, Vol. 26 ›› Issue (9): 94301-094301.doi: 10.1088/1674-1056/26/9/094301
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Yan-Feng Xu(徐琰锋), Wen-Xiang Hu(胡文祥)
Yan-Feng Xu(徐琰锋), Wen-Xiang Hu(胡文祥)
摘要:
Ultrasonic Lamb waves are considered as a sensitive and effective tool for nondestructive testing and evaluation of plate-like or pipe-like structures. The nature of multimode and dispersion causes the wave packets to spread, and the modes overlap in both time and frequency domains as they propagate through the structures. By using a two-component laser interferometer technique, in combination with a priori knowledge of the dispersion characteristics and wave structure information of Lamb wave modes, a two-component signal processing technique is presented for implementing dispersion removal and mode separation simultaneously for two modes mixture signals of Lamb waves. The proposed algorithm is first processed and verified using synthetic Lamb wave signals. Then, the two-component displacements test experiment is conducted using different aluminum plate samples. Moreover, we confirm the effectiveness and robustness of this method.
中图分类号: (Ultrasonics, quantum acoustics, and physical effects of sound)