基于动力特征参数的板类结构损伤诊断

Damage diagnosis of plate structures by using dynamic eigenparameters

以两对边固定、两对边简支方形弹性薄板为研究对象,通过数值计算得到板损伤前后的多阶模态参数,以此定义位移特征参数及转角特征参数并用于板的损伤诊断研究。结果表明这两类参数均可用于结构损伤的探测与定位,并能大致判断损伤的程度,其中又以后者的精度为优。

Using square elastic thin plates with two fixed opposite edges and two simply supported opposite edges as analytical models, their mode shapes and frequencies are calculated by numerical method at first, then displacement eigenparameters and rotation eigenparameters are defined and used to identify damage. The effectiveness of using the two kinds of parameters in detecting and locating damage, as well as approximately determining extent of damage is demonstrated. Simulative calculating shows that the latter of the two kinds of parameters is a better damage indicator.