基于响应能量和连续小波变换的复合材料结构损伤检测

Damage Detection of Composite Structure Using Jointly Response Energy and Continuous Wavelet Transform (CWT)

提出了一种基于响应能量和连续小波变换联合检测损伤的方法。首先测试随机激励下完好结构以及损伤结构各个节点的响应信号能量并分别组成能量向量,然后选取正交小波函数,分别对损伤前后的能量向量进行连续小波变换,根据损伤前后小波系数的变化来检测结构的损伤,并以小波系数二次差分的极大值作为损伤指标来进行损伤定位。该方法仅仅利用结构在随机激励下的时域响应信号,并不需要进行结构建模。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的损伤检测,验证了该方法的可行性和有效性。

Aim. Xu and Wu proposed energy damage detection strategy for bridge structures. We propose combining response energy with CWT for damage detection of composite structures. Section 2 of the full paper does essentially five things： （1） it calculates respectively the response energies of the time domain responses of intact and damaged structures under steady random excitation and then analyzes the response energies with CWT method; （2） it adopts the biorthogonal wavelet function; （3） it can identify the damage of a structure by calculating respectively the differences of wavelet coefficients of the intact structure and the corresponding ones of the damaged structure; （4） it uses a lengthy procedure to determine the damage location; （5） it gives computer simulation results for two numerical examples. Fig. 2 for a composite beam and Figs. 4 through 7 for a composite plate. Section 3 presents in Fig. 10 the results of some model tests of a composite wing; they demonstrate preliminarily that our proposed method of damage location using jointly response energy and CWT can determine damage location precisely.