基于小波包分析的结构损伤定位方法

提出了基于小波包节点能量（WPCE）相对变化量的结构损伤定位方法，采用其斜率向量和曲率向量2个指标作为损伤定位的依据，从而做到对于结构损伤的无模型定位，最后通过数值算例验证了该方法的可行性。

Damage Localization of Structures by Wavelet Packet Analysis

A new technique of damage localization based on the relative change of the wavelet packet component energy(WPCE) was proposed.This method assumed that the acceleration response time histories both before and after damage were available.The relative change of the WPCE was calculated through a proper level of wavelet packet analysis.The slope index and curvature index were presented to judge the location of damage without the model.At last,a numerical example with 10-storey shear-beam building frame was presented to prove this method.Results showed that the slope index and curvature index could be used to locate both single and multiple damages that exist in the structure.Also the accuracy of the indexes did not seem to be affected by the presence of 20-25 dB measurement noise.