| 张继楷,周芳芳,姚孟迪,房宽达,冯搏.基于冲击响应的非对称兰姆波频散曲线快速重构方法*[J].,2025,44(4):923-929 |
| 基于冲击响应的非对称兰姆波频散曲线快速重构方法* |
| Rapid measurement of dispersion curves of asymmetrical mode lamb wave by reconstructing velocities from impacts |
| 投稿时间：2024-02-19 修订日期：2025-06-25 |
| 中文摘要: |
| 频散曲线是描述频率与兰姆波相速度或群速度的关系曲线。频散曲线对于研究兰姆波在板内的传播以及实现一些无损检测算法（如损伤定位）至关重要。本文提出了一种快速测量复合材料板中非对称模态兰姆波频散曲线的新方法。通过在板中加载垂直方向的冲击载荷产生宽频兰姆波，兰姆波由两个压电换能器记录并转换为电压信号。采用连续小波变换将信号分解为不同的频率，对于每个频率，根据波在两个换能器中的到达时间及其到冲击位置的距离来计算速度，在获得不同频率的群速度后，绘制频散曲线。通过实验获取了一定频率范围内的频散曲线，群速度的频散曲线与常规单频测量的结果一致，验证了此方法的可行性。 |
| 英文摘要: |
| A dispersion curve is a plot of the phase velocity or group velocity of Lamb wave as a function of frequency. Dispersion curves are essential for the study of the propagation of Lamb waves inside a plate. They are also important for the implementation of some nondestructive testing algorithms such as localization of damages. In this paper, a new method is proposed to rapidly measure the dispersion curve of asymmetrical mode Lamb wave in a composite plate. Broadband Lamb waves are excited by an impact that is caused dropping a small ball onto the plate surface. The waves are recorded by two piezoelectric transducers and are converted to voltage signals. Continuous wavelet transform is applied to decompose the signals into different frequencies. For each frequency, the velocity is calculated according to the arrival times of the wave in the two transducers and their distances to the impact location. After obtaining the group velocities for various frequencies, the dispersion curve is plotted. The dispersion curve in a certain frequency range is obtained by experiments. The dispersion curve of group velocity is consistent with the results of conventional single frequency measurement, which verifies the feasibility of this method. |
| DOI：10.11684/j.issn.1000-310X.2025.04.013 |
| 中文关键词: 频散曲线 兰姆波；冲击响应；复合材料；无损检测 |
| 英文关键词: dispersion curve Lamb wave impact composite nondestructive testing |
| 基金项目:国家自然科学基金青年基金项目（52209153）；国家自然科学基金青年基金项目（52105551）；长江科学院开放研究基金资助项目（CKWV20221022/KY）;中国长江三峡集团有限公司科研项目（202103471），中国三峡建工（集团）有限公司科研项目（JGAJ0302222001） |
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