基于改进HHT的多模式Lamb波信号的时频分析

Time-Frequency Analysis of Multi-Mode Lamb Waves by Improved HHT

摘要: Hilbert-Huang变换(HHT)是一种新的分析非平稳非线性信号的方法，是用经过带通滤波器组滤波后再进行HHT分析的方法。使用该方法对多模式Lamb波信号进行了分析，能有效分离信号中的各固有模态函数(IMF)分量，消除了噪声干扰。改进HHT变换结果的图线光滑清晰，可解释性好，使用该方法对Lamb波进行分析具有可行性和有效性。

Abstract: Hilbert-Huang transform is a new method to analyze non-stationary and non-linear signals. The multi-mode Lamb wave signals were analyzed by an improved HHT method, which combined band-pass filter group with HHT analysis. Using this technique, the Intrinsic Mode Function, IMF components were separated efficiently and the noise was suppressed dramatically, which suggested that this method was feasible and effective for Lamb wave analysis.