标题：Structural discontinuity locating based on the reflection of guided waves
作者：She, Xunfeng ;Huang, Zhenyu ;Fan, Qiang ;Ji, Lin
作者机构：[She, Xunfeng ;Ji, Lin ] School of Mechanical Engineering, Shandong University, Jinan; 200240, China;[Huang, Zhenyu ;Fan, Qiang ] School of Electronic 更多
会议名称：21st International Congress on Sound and Vibration 2014, ICSV 2014
会议日期：13 July 2014 through 17 July 2014
来源：21st International Congress on Sound and Vibration 2014, ICSV 2014
摘要：As some guided waves may propagate along the structures in a long distance and occur re-flection and transmission at discontinuities, the discontinuities may be located by positioning guided-wave probes along the structure and measuring the reflected and transmitted waves. In this inspection method, the locating accuracy is higly related to the dispersive characteristics of the guided waves. However, although the dispersive characteristics of waves, which is can be estimated by theoretical and numerical methods, some particular types of waves are difficult to excite and measure in experiments, and consequently their dispersive characteristics are difficult to obtain. This paper explores a discontinuity monitoring system for infinite structures using measured wavenumbers. The propagating features of waves, as well as the reflection properties near a discontinuity, were firstly derived to relate the discontinuity location and the wave amplitudes. Meanwhile, the measured diplacements, which are acquired from the probes, are introduced to represent the wave dispersive characteristics to provide a robust discontinuity locating. An experiment on a cracked beam was designed to validate the effectiveness of this method. It's expected that this method can provide an accurate discontinuity detection with the locating error less than 0.2%. Copyright © (2014) by the International Institute of Acoustics & Vibration All rights reserved.