中南大学学报（自然科学版）2013，Vol.44Issue(7)：3014-3023,10.
基于敏感模态单元应变能法结构损伤识别
Structural damage identification using element strain energy method based on sensitive modals
摘要
Abstract
According to the rate of change of eigenvalues of undamaged and damaged structure,modals with higher sensitivity for the damage element strain energy change were selected.Based on this,an efficient structural damage identification method with better robustness was established.Starting from the structural vibration equation,the relationship between the rate of change of the eigenvalue and strain energy changes before and after structural damage was derived.A structural damage identification equation consisted of the rate of change of a characteristic value,the element damage factor,element damage sensitivity factor and element damage correction factor was built.A damage location indicator of structure was established by applying the element damage correction factor and an analytical expression of the element damage factor was derived using structural damage identification equation.The proposed method was applied to a new shell breakwater structure to identify the location and degree of damage,including a single damage and multiple damage.Finally,the noise immunity of the proposed damage identification method was tested.The results show that this method has better robustness and high accuracy recognition results,which shows that the proposed method has a high efficiency.关键词
特征值变化率/单元应变能/结构损伤识别方程/鲁棒性Key words
rate of change of eigenvalues/ element strain energy change/ structural damage identification equation/robustness分类
数理科学引用本文复制引用
张效忠,姚文娟..基于敏感模态单元应变能法结构损伤识别[J].中南大学学报（自然科学版）,2013,44(7):3014-3023,10.基金项目
国家自然科学基金面上项目(11072143) （11072143）
浙江省教育厅科研项目(Y201223039) （Y201223039）
