基于修正模态应变能指标的板结构损伤定位  

THE DAMAGE LOCALIZATION FOR PLATE STRUCTURES BASED ON MODIFIED MODAL STRAIN ENERGY INDEX

作　　者：梁振彬 董聪[1] 张华昕 LIANG Zhenbin;DONG Cong;ZHANG Huaxin(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《力学与实践》2017年第6期585-590,共6页Mechanics in Engineering

基　　金：国家电网公司科技项目(GC71-12-001)资助

摘　　要：为解决模态应变能方法识别中产生的"邻近效应"问题,提出基于修正模态应变能指标的板结构损伤定位方法.该方法首先利用邻近测点的应变能变化相对大小计算权重系数,再根据权重系数对测点相应区域的应变能进行重新分配.此外,通过定义的损伤辨识度指标研究噪声对损伤定位结果的影响.为验证本文所提方法的可行性和有效性,以一个四边简支板为数值算例.算例结果表明,本文方法对于点状、块状和带状损伤都可以实现准确定位,且具有良好的抗噪性.In order to deal with the\vicinity e?ect"in the damage localization of plate structures,this paper proposes a method based on the modiˉed modal strain energy.Firstly,the relative strain change at adjacent points are used to calculate the weight coe±cients,Then the strain energy in the corresponding area is redistributed according to the weight coe±cients.By deˉning a damage di?erentiation degrees index,the in°uences of the noise on the damage localization can be evaluated.To verify the feasibility and the e?ectiveness of the proposed method,a four edge simply supported plate is used as a numerical example.It is shown that the proposed method can realize an accurate damage localization in dot,block and strip damage cases,with a good anti-noise capability.

关 键 词：损伤定位 板结构 模态应变能 抗噪性 

分 类 号：TU311.3[建筑科学—结构工程]