基于频率指标用BP网络进行结构损伤识别

Structure Damage Identification with BP Network Based on Frequency Index

基于摄动理论,推导出结构的频率变化比为结构损伤位置的函数,以此为损伤指标,结合BP网络进行结构损伤识别.以悬臂梁为研究对象,通过使结构刚度下降来模拟损伤情况,用结构损伤前后的频率变化比构造网络输入,对损伤进行定位分析.选取不同的损伤工况进行模拟计算,结果表明识别效果比较理想.

Based on the perturbation theory, it is proved that frequence changes ratio is the function of structural damage location With it as the damage index, the BP network is applied to the structure damage identification. Taking a cantilever beam for example, the stiffness descending is used to simulate the structure damage. Also,the network input is made by the ratio of frequency changes, and the damage location is fixed by using BP network. Besides, the damage is analyzed. The analog computation is carried on by choosing different damage conditions, and the results show that the identification effect is ideal.