网壳结构损伤分区定位的模型试验研究

提出了一种适合于网壳结构的损伤分区定位方法,该方法对网壳结构进行区域划分并按区布置传感器,通过单点激励得到结构的高阶模态响应,利用随机减量技术和ITD法获取模态参数,再利用损伤前后高阶振型的差值来定位损伤区域。最后,通过对一个单层椭球面网壳结构模型的振动测试试验,验证了所提方法的可行性。

Model Expenriment Studies on Zoning Location for Damage of Latticed Shell Structures

A zoning location method is presented for damage of latticed shell structures. Using this method one zones a latticed shell structure, disposes sensors according to zones, and makes use of structural higher order mode responses which can be obtained using a single-point exciting to a structure. Modal parameters are identified by random decrement technique and ITD method. The damage zones are located by use of the differences between the higher order modal shapes before and after the structure is damaged. In the end, through a vibration test to a single-layer ellipsoidal latticed shell model, the feasibility of the method presented here is validated.