多处损伤结构的损伤诊断

Identification in Structures with Various-point Damages

利用损伤前后结构自由振动有限元离散方程的变化 ,确定结构的损伤位置 ;并以低阶模态作为状态变量 ,由最小二乘法建立目标函数 ,通过非线性迭代得到损伤程度的识别值。由算例结果可知 。

The damage identification of structures is studied with real-time forced vibration in this paper.The location of damage is identified by the changes of the mathematical dynamic free-vibration equations.The alternate iterative method in the nonlonear mininmizing process has been presented to determine the degree of the damages, on the base of finite element method and the least square method.From the identification results of ilustration by this method indicate that the method is efficient and rapid.