利用频率指纹检测板类结构的块状损伤

Patch-Shape Damage Detection of Plate Structures Based on Natural Frequencies

以一矩形板为例,说明了利用其块状损伤定位的频率指纹并结合结构的有关频率指纹参数可以进行板的损伤定位。损伤位置确定后,利用板在这一位置的损伤程度与板损伤前后的频率变化率的关系,可以确定损伤的程度。数值仿真研究表明了方法的可行性。

Using a rectangular plate as analytical model,a methodology is demonstrated for locating the plates' patch-shape damage by using signatures of natural frequencies,which are only related with the location of damage.After the localization of the damage,the extent of the damage can be determined according to the relation between the damage extent with the change rate of natural frequencies before and after damage.Numerical simulation verified that the method is feasible to the damage detection of structures.