基于HHT技术的复合材料结构损伤定位研究

Detecting Anomalies in Plates Based on HHT

Hilbert-Huang Transform(HHT)是一种新型的信号处理方法,主要适用于非线性、非平稳信号的分析,其应用已经越来越广泛。现将此方法应用在复合材料板的一维损伤定位实验中。在复合材料板损伤前和损伤后各采集一组信号,对其进行HHT分析。对比分析结果——二者的时间-振幅与时间-频率分布,在图中读出差异,从而定位出损伤的位置。实验结果显示,应用HHT技术可以较好的进行复合材料板上的一维损伤定位。

In 1998, a new data analysis method, Hilbert Huang Transform （HHT）, was developed by Norden E. Huang of NASA. This new method is proved to be ideal for non-linear and non-stationary data＇ analysis. And it has been put into practice in several fields with good results. The method is based on two major parts： Empirical Mode Decomposition （EMD） and Hilbert Transform. This paper illustrates the feasibility of HHT as a signal processing tool for locating an anomaly in the form of a crack plate, The basis of detection hinges on simple wave propagation concepts using flight times and velocities. The result indicates that HHT is able to represent a localized event well.