Damage localization under ambient vibration using changes in flexibility

查看全文 作　　者：[1]高勇;[2]苏磐石 机构地区：[1]Department of Civil Engineering & Geological Science,University of Notre Dame,Notre Dame,IN 46556,USA.Ph.D student;[2]Department of Civil & Environmental Engineering,University of Illinois at Urbana-Champaign,205 North Matthews Ave,Urbana,IL 61801,USA Nathan M.Newmark Professor 出　　处：《Earthquake Engineering and Engineering Vibration》索引2002年第1卷第1期,共9页 基　　金：Notional Science Foundation Grant CMS 99-00234 摘　　要：In recent years, Structural Health Monitoring (SHM) has emerged as a new research area in civil engineering. Mostexisting health monitoring methodologies require direct measurement of input excitation for implementation. However, in manycases, there is no easy way to measure these inputs - or alternatively to externally excite the structure. Therefore, SHM methodsbased on ambient vibration have become important in civil engineering. In this paper, an approach is proposed based on the DamageLocation Vector (DLV) method to handle the ambient vibration case. Here, this flexibility-matrix-based damage localization methodis combined with a modal expansion technique to eliminate the need to measure the input excitation. As a by-product of thisapproach, in addition to determining the location of the damage, an estimate of the damage extent also can be determined. Finally, anumerical example analyzing a truss structure with limited sensors and noisy measurement is provided to verify the efficacy of theproposed approach. 关 键 词：FLEXIBILITY matrix damage location vector method MODAL EXPANSION natural EXCITATION technique EIGENVALUE REALIZATION algorithm.