| 李冰,励争*,刘瑜.激励脉冲信号对基于周向导波的圆环损伤检测的影响[J].实验力学,2012,27(5):607~617 |
| 激励脉冲信号对基于周向导波的圆环损伤检测的影响 |
| Influence of Excitation Pulse Signal on Circular Ring Damage Detection Based on Guided Circumferential Wave |
| 投稿时间：2012-04-05 修订日期：2012-07-15 |
| DOI： |
| 中文关键词: 激励脉冲 周向导波 径向裂纹 Gabor小波变换 损伤检测 |
| 英文关键词:impact pulse guided circumferential wave radial crack Gabor wavelet damage detection |
| 基金项目: |
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| 中文摘要: |
| 针对含有径向裂纹的圆环,本文主要研究了不同激励脉冲信号对基于周向导波的圆环损伤检测结果的影响。根据圆环周向导波的频散曲线,采用Gabor小波变换分析了不同激励脉冲信号产生的导波信号,通过数值模拟和实验测试方法探讨并验证了提高径向裂纹检测精度的激励方式,同时定性给出选择合适激励脉冲的标准,为基于导波的损伤检测方法在实际工程中的应用提供了依据。 |
| 英文摘要: |
| This paper investigates the influence of impact pulse duration on radial crack detection in annulus structures based on guided circumferential waves. The annulus without crack or with Crack can be impacted by different pulse duration cases, and the strain signals are numerically calculated by ABAQUS program. And then, the data are processed by continue wavelet transform (CWT) to locate the radial crack. The results show that the pulse duration had a big influence on the accuracy of damage location. According to the group velocity dispersive curve of annulus, how to locate the crack position is discussed. Finally, to verify the choice of the right pulse duration in damage detection, two experiments are carried out to obtain the same conclusion. |
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