HU Yong, XU Chun-guang, ZHOU Shi-yuan, et al. Application of improved HHT in multi-mode Lamb wavestest for laminated composite material[J]. 2009, 28(6): 110-113.
HU Yong, XU Chun-guang, ZHOU Shi-yuan, et al. Application of improved HHT in multi-mode Lamb wavestest for laminated composite material[J]. 2009, 28(6): 110-113. DOI: 10.13873/j.1000-97872009.06.015.
HHT在复合材料Lamb波检测中的应用
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。
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.