基于应变模态分析的损伤识别方法研究  

Damage Identification Method Based on Analysis of Strain Modal

作　　者：牛雪梅[1] 王锋[2] 熊晓燕[2] 孟文俊[1] 

机构地区：[1]太原科技大学电子信息工程学院,山西太原030024 [2]太原理工大学机械电子工程研究所,山西太原030024

出　　处：《中北大学学报（自然科学版）》2011年第6期682-687,共6页Journal of North University of China(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50975188);山西省自然科学基金资助项目(2011011019)

摘　　要：针对传统的结构损伤识别指标对结构早期局部损伤不敏感的现状,基于应变模态参数识别技术,研究了一种能识别早期损伤位置和损伤程度的损伤评价指标.该指标是测量结构上一系列关键点的应变,运用应变模态参数识别技术获得应变模态振型,并构造应变模态差这一损伤评价指标,达到了识别结构早期损伤位置和损伤程度的目的.数字仿真和实验结果表明,应变模态振型在非模态节点对损伤非常敏感,而应变模态差在结构模态节点对损伤非常敏感.综合运用这两个指标,实现了结构早期损伤的识别.As the traditional damage identification indicator is not sensitive to the early partial damage,a damage identification indicator that can identify the position and the degree of early damage was studied based on strain modal.This indicator measured strain measurements of a series of key points,and then the technique of the parameter identification of strain modal was used to get the strain modal shape,and the differences between the strain modal shapes was gained,thus to achieve the purpose of identifying the position of early damage and degree the damage.Digital simulation and experimental results show that the strain mode shape is very sensitive to the damage at the non-modal node,and the difference between the strain modes is very sensitive to the damage at the modal node.By using these two indicators,the identification of early damage can be realized.

关 键 词：损伤识别 应变模态 环境激励 应变模态差 

分 类 号：TB12[理学—工程力学]