基于频率指纹的梁类结构损伤定位方法研究

利用摄动原理探讨了基于振动模态分析的结构无损检测技术,并把频率变化平方比和正则化频率变化率应用于连续梁,从理论上验证了频率指纹是结构损伤位置的函数。利用该方法对连续梁进行了数值模拟试验,总结出利用梁频率的正则化频率变化率进行损伤定位的步骤。方法简单可行,可为解决工程实际问题提供参考。

Study on Damage Locating Method in Beam-like Structure by Frequency Identification

A nondestructive detection technique in structures based on modal analysis was discussed by microphonics theory.The frequency change square ratio and the normalized change ratio of frequency were applied as parameters to complex structures such as continuous beams,which verified theoretically that this frequency identification was the function of structural damage localization.Using this method a numerical simulation test was carried out on continuous beams.The procedures of damage localization by normalized frequency change ratio were summarized.The results show that this method is simple and feasible and can provide a reference for the solution of practical engineering problems.