摘要
提出一种基于振型相关度的网壳结构状态特征向量,该向量的构造仅使用少量模态和有限测点.通过一个网壳结构模型试验分别设计结构质量和刚度改变的8个结构状态工况,实测各工况的状态特征向量,并对其性质进行检验,结果表明,所提出的结构状态特征向量具有较好的敏感性、可辨识性和抗噪性.最后,通过对试验模型的有限元分析,证明了状态特征向量用于损伤识别的可能性.
A structural cindition characteristic vector of latticed domes is presented based on modal correlation.The vector is only composed of several modes and a few measuring points.Eight conditions about mass and stiffness modifications are tested on a structural model of latticed dome.The structural condition characteristic vectors of eight conditions are obtained and the properties of the vectors are checked.The results show that the vectors have high sensitivity,good resolution performance and noise robustness,Finally ,through finite element analysis to esperimental model,it is proved that the structural condition characteristic vector is possible to be applied on damage identification.
出处
《空间结构》
CSCD
北大核心
2015年第1期14-18,33,共6页
Spatial Structures
基金
国家自然科学基金项目(50878010
51108009)
关键词
网壳
振型
特征向量
状态识别
试验
latticed shell
mode of vibration
characteristic vector
condition identification
experiment
