基于频响函数曲率的结构损伤检测

结构的损伤能够引起结构动力参数的变化。为了更明确地显示损伤,文中用频响函数曲率、频响函数曲率差、频响函数曲率比三种指标来进行损伤诊断。考虑到单处损伤及多处损伤情况,对简支梁进行数值模拟,并用上述三种指标进行了诊断。对比结果表明,在单损情况时,频响函数曲率差及曲率比都对损伤位置敏感;但在多损情况时,频响函数曲率比对损伤位置更加敏感。

Structure Damage Detection Based on the Frequency Response Function Curvature Method

The change of structural kinetic parameter will be caused by structural damage. In order to identify damage in structure more definitely, the data was analyzed using frequency response function （FRF） curvature method. FRF curvature difference method and FRF curvature ratio method. In view of single damage and multiple site damage, numerical simulation was made to single beam, and diagnosed use the three methods mentioned above. Comparison of results showed that FRF curvature difference and FRF curvature ratio were sensitive to single damage, but FRF curvature ratio was more sensitive to multiple site damage.