摘要
在结构柔度矩阵的基础上,提出了一种结构的节点柔度灵敏度和单元柔度灵敏度的计算方法.利用计算出的柔度灵敏度构造损伤定位指标,用于三跨连续梁单个单元和两个单元损伤定位.在此基础上,用状态反馈控制的方法有目的地对结构进行极点配置,得到所需的受控结构的特征值和特征振型,并采用受控结构的特征值和特征振型构造柔度灵敏度指标,进一步提高损伤识别指标对损伤的敏感程度.三跨梁的数值仿真结果表明:该柔度灵敏度指标能达到较好的损伤定位效果;在检测结构适当位置施加控制力,采用受控结构的动力特性数据进行损伤识别,可进一步提高损伤定位的诊断率.
Computational methods of nodal flexibility sensitivity and elemental flexibility sensitivity based on the matrix of the flexibility of structures were proposed. The indicator of damage localization, which was used for localizing one element and two elements＇ damages in a three-span continuous beam, was constituted by the sensitivity of element flexibility. The state feedback control method was adopted to place the poles of the structure intentionally and the required characteristic frequencies and corresponding mode shapes of the controlled structure are obtained subsequently, and they are further used to enhance the sensitivity of the indicator to the damages. Numerical results Show that the indicator derived from element flexibility sensitivity can obtain good damage localization results and the diagnosis ratio can be greatly improved using the dynamic characteristic data of the structure under control if the control forces are placed at the proper positions of the structure under consideration.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第9期5-7,共3页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(50479050)
关键词
工程结构
受控结构
动力特性
反馈控制
损伤定位
柔度灵敏度
engineering structure
controlled structure
dynamic characteristics
feedback control
damage localization
flexible sensitivity
