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总览 评价 杨智春 1，* ， 党晓娟 1， ， 谭光辉 2， （ 1、 西北工业大学； 2、 西北工业大学航空学院； ） 摘要： 提出了一种基于互相关函数幅值向量（Cross correlation function amplitude vector, CorV）和连续小波变换(continuous wavelet transform,
杨智春1，*， 党晓娟1，， 谭光辉2，
（
1、西北工业大学； 2、西北工业大学航空学院； ）
摘要：
提出了一种基于互相关函数幅值向量（Cross correlation function amplitude vector, CorV）和连续小波变换(continuous wavelet transform, CWT) 联合检测损伤的方法。选取双正交小波函数，首先计算随机激励下完好结构和损伤结构的互相关函数幅值向量，再分别对其进行连续小波变换，根据损伤前后小波系数的变化来检测结构的损伤，并以小波系数差的模最大值作为损伤指标来进行损伤定位。该方法无需对结构建模，仅需获取结构损伤前后的时域响应信号。通过对带有不同位置分层损伤的复合材料层合梁和层合板损伤检测的数值仿真，验证了用本文方法检测复合材料结构分层损伤的有效性。
关键词：
互相关函数幅值向量；小波变换；损伤检测；复合材料结构；分层损伤
Yang Zhichun*， Dang Xiaojuan， Tan Guanghui
（
Northwestern Polytechnical University； ）
Abstract：
A hybrid method of the Correlation Function Amplitude Vector（CorV）and the Continuous Wavelet Transform (CWT) is proposed to detect damage of composite structures. In this method, only the time domain signals of the intact and damaged structure are required in the detection procedure. The CorVs of the time domain responses of the intact and damaged structure under steady random excitation are calculated and then these CorVs are analyzed by continuous wavelet transform. In the present study, the Biorthogonal wavelet function is adopted. The damage of the structure can be identified by the difference of wavelet coefficients between those of the intact and damaged structure. The damage location is determined by the maximum value of the modulus of the coefficients difference obtained from CorVs of intact and damaged structures. The feasibility and effectiveness of the proposed hybrid method is verified by numerical simulations of delamination damage detection for a composite beam and a laminate plate.
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