基于曲率模态差的四边固支薄板的损伤检测

以四边固支板为研究对象，采用改变单元弹性模量的方法模拟结构损伤，分别应用基于振型、频率和模态曲率差的损伤识别方法识别结构损伤。结果表明：在薄板一个比较小的区域损伤的情况下，其振型与频率的改变量是很小的，很难判断损伤位置，而有损伤单元的模态曲率差的值却发生明显的变化，因此采用模态曲率差法对结构进行损伤识别可以准确判定损伤的位置。

Damage detection for elastic thin plate with four simply clamped edges based on curvature model difference

Taking the clamped slab as the study object,the research simulated the structural damage by changing the elastic modulus of elements and detected the damage based on the vibration modes,the frequency,and the mode curvature difference respectively.The results show that the vibration modes and the frequency changed too little to identify the damaged location in the thin slab with small area damaged,while the curvature mode difference of the damage element changed obviously.Therefore the location of the structure damage can be identified exactly by using the method of the curvature mode difference.