复合材料蜂窝夹芯结构低速冲击位置识别研究

进行了碳纤维增强复合材料蜂窝夹芯结构的低速冲击实验，采用一种基于应力波和免疫遗传算法的冲击载荷定位方法对蜂窝夹芯结构上的低速冲击载荷进行分析和定位。首先，通过一组事先确定冲击位置的低速冲击载荷产生的冲击应力波实验数据，使用小波变换方法对其在时频域进行分析，获得多个频率上冲击应力波在蜂窝夹芯结构中的传播速度；然后在此基础上，考虑蜂窝夹芯结构中应力波的各向异性特性，采用免疫遗传算法对未知的低速冲击载荷进行位置识别。实验研究结果表明了该方法的可行性和有效性

Localization of low-velocity impact on a composite honeycomb sandwich structure

Low-velocity impact tests were performed on a carbon fiber reinforced composite honeycomb sandwich structure,and a localization method using stress wave and immune genetic algorithm(IGA) was used to analyze and locate the low-velocity impact on this composite structure.Firstly,after obtaining a set of impact-induced stress wave signals from location pre-determined impact tests,wavelet transformation was used to analyze these stress wave signals in time-frequency domain to obtain the propagation velocity of the impact-induced stress waves in the composite structure.Then,considering the anisotropic properties of stress wave propagation in composite honeycomb structure,IGA was employed to identify the location of unknown low-velocity impact.Experimental results demonstrated the applicability and effectiveness of the proposed impact localization method.