| HHT在复合材料Lamb波检测中的应用 |
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| 引用本文： | 胡勇,徐春广,周世圆,许寒辉.HHT在复合材料Lamb波检测中的应用[J].传感器与微系统,2009,28(6):110-113. |
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| 作者姓名： | 胡勇 徐春广 周世圆 许寒辉 |
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| 作者单位： | 北京理工大学,控制与检测实验室,北京,100081 |
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| 摘 要： | Lamb波信号是典型的非平稳非线性信号，根据无损检测的需要，采用改进的Hilbert-Huang变换（HHT）方法，克服了多模式Lamb信号间的相互干扰，消除了噪声影响。以带有缺陷的复合材料层合板为实验对象，结果证明：本方法能够有效分离信号中的各个固有模态函数（IMF）分量，通过各分量瞬时幅值的峰值回归直线，可准确地对缺陷尺寸进行分析与评估。
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| 关 键 词： | 超声波检测 Lamb波 时频分析 Hilbert-Huang变换 |
Application of improved HHT in multi-mode Lamb wavestest for laminated composite material |
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| HU Yong,XU Chun-guang,ZHOU Shi-yuan,XU Han-hui.Application of improved HHT in multi-mode Lamb wavestest for laminated composite material[J].Transducer and Microsystem Technology,2009,28(6):110-113. |
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| Authors: | HU Yong XU Chun-guang ZHOU Shi-yuan XU Han-hui |
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| Affiliation: | ( School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China) |
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| Abstract: | Hilbert-Huang transform(HHT) is a new method to analyze non-stationary and non-linear signals.The multi-mode Lamb waves signals are analyzed by an improved HHT method,which combined band-pass filter group with HHT analysis.By the intrinsic mode function,IMF components are separated efficiently,and the noise is suppressed dramatically,which suggestes that this technique is feasible and effective for Lamb waves testing. |
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| Keywords: | ultrasonic testing Lamb waves time-frequency analysis HHT |
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