空间桁架结构残余力最小秩修正法损伤识别  

RESIDUAL FORCE MINIMUM RANK UPDATE METHOD FOR DAMAGE IDENTIFICATION OF SPACE TRUSS STRUCTURES

作　　者：蒋舸 冯晓东 JIANG Ge;FENG XiaoDong(College of Civil Engineering,Shaoxing University,Shaoxing 312000,China;Jinggong Steel Building Group,Shaoxing 312000,China)

机构地区：[1]绍兴文理学院土木工程学院,绍兴312000 [2]浙江精工钢结构集团有限公司,绍兴312000

出　　处：《机械强度》2019年第6期1480-1485,共6页Journal of Mechanical Strength

基　　金：绍兴市科技计划项目(2017B7006);浙江省空间结构重点实验室开放基金项目(201704)资助~~

摘　　要：基于最小秩损伤识别方法,提出一种最小秩修正法进行空间桁架结构体系损伤识别研究。通过引入特征值矩阵将残余力方程与最小秩修正法完美结合起来,较好地解决所取用的模态个数必须等于刚度摄动矩阵的秩这一问题,最终由最小秩修正法来求解空间桁架结构损伤位置和损伤程度。以一个空间桁架结构体系为例验证最小秩修正法,分析讨论测量噪音的影响。研究结果表明,最小秩修正法是准确可靠的,且有较强的鲁棒性。Based on the minimum rank damage identification method,a minimum rank update method is proposed to study the damage identification of space truss structures.The propose combines the residual force equation with the minimum rank update method by introducing the eigenvalue matrix,effectively dealing with the problem about the number of taken modes must be equal to the rank of the stiffness perturbation matrix,and ultimately solving the space truss structure damage location and damage degree by the minimum rank update method.A space truss structure is taken as an example to verify the minimum rank update method,and the influence of measurement noise is analyzed and discussed.The results show that the minimum rank update method is accurate and reliable,and has strong robustness.

关 键 词：损伤识别 残余力 最小秩修正 特征值矩阵 

分 类 号：TB303[一般工业技术—材料科学与工程]