基于试验模态振型的结构损伤检测参数比较  

Research of structural damage detecting parameters based on experimental mode shapes

作　　者：沈文浩[1] 张森文[2] 李长友[1] 曹玉华[1] 康要强 

机构地区：[1]华南农业大学南方农业机械与装备关键技术省部共建教育部重点实验室,广东广州510642 [2]暨南大学应用力学研究所,广东广州510632 [3]广州市城市建设开发有限公司,广东广州510620

出　　处：《暨南大学学报（自然科学与医学版）》2008年第3期268-271,共4页Journal of Jinan University(Natural Science & Medicine Edition)

基　　金：国家农业科技成果转化资金(2006E00100286);广东省农业科技攻关计划(2005B20601001)

摘　　要：结构在使用过程中,当受到外界环境变化(如腐蚀、疲劳、冲击、过载等)的影响时,容易产生损伤破坏。结构损伤会引起结构的几何形态或者材料性质产生变化。因此,无损检测技术对于确保结构的安全性、可靠性以及使用寿命有着至关重要的意义。结构损伤检测研究的主要方法是寻找到一种参数,它可以通过对测量得到的特征向量的变化值进行计算分析来获得。这种损伤敏感参数必须满足在损伤位置能够出现明显的"跳动"这个条件,从而可以判定损伤的位置以及程度。本文结合对悬臂梁的试验模态分析数据,对现有的两种基于模态振型的损伤识别方法进行了研究,并对这两种方法的可靠性进行了验证分析。Structures are prone to damage during their service lives, caused by factors such as corrosion, fatigue, impact and overloads. Structural damage causes deviations of geometric or material properties from nominal or baseline values. Thus, techniques for nondestructive damage detection are essential to ensure safety, reliability and operational life. A main theme of this research field has been to formulate a parameter, calculated by using measured changes in eigenvectors, which exhibits a significant ＂jump＂ at the damage location. This damageensitive parameter thus serves to localize the damage and assess its severity. Experimental modal analysis of damaged cantilevered beams was used to study the previously proposed pragmatic parameters which are based on mode shapes to exhibit the desired jump. The reliabilities of them are tested by using the model experimental data.

关 键 词：损伤检测 试验模态分析 振型 识别参数 

分 类 号：O329[理学—一般力学与力学基础]