基于测试频率的损伤定位技术及其数值分析

Damage Detection Based on Testing Frequency and its Numerical Analysis

推导了基于测试频率平方变化比的损伤定位方法,利用有限元方法对一管道结构以刚度折减法进行了损伤模拟和模态分析数值计算。结果表明,结构频率的平方变化比是损伤位置和损伤程度的函数。结构频率是较易测得的结构模态参数,据此作为损伤定位和损伤程度评估的依据简单可靠,具有较高的应用价值。

A methodology was put forward for damage location, and damage simulating as well as numerical calculation of modal analysis was carried out on a truss plane bridge by stiffness discount. It was proved that frequency change square ratio was a parameter for damage location and damage degree in a structure. The structural frequency could be acquired easily, so it was simple and reliable to take it as the evidence for damage location and damage degree evaluation.