Model updating and damage detection of damped systems using incomplete complex modes

摘要：

In the study of finite element model updating methods,most papers are devoted to undamped systems; thus,their model updating has been exclusively restricted to the updates for the mass and stiffness matrices.Considering systems with non-proportional damping,this paper addresses the simultaneous updates for the mass,damping and stiffness matrices of a finite element model.In modal testing,the measured modes are often few,complex valued,and spatially incomplete.Through the framework of model reduction or modal expansion,this paper theoretically extends a recently developed cross-model cross-mode(CMCM)model updating method when only a few spatially incomplete complex modes are measured.One theoretical development is an iterative procedure to compute the transformation matrix(between the master and slave degrees-of-freedom)associated with the updated model,instead of that of the baseline model routinely used in traditional studies.Numerical studies are conducted for a 30-DOF cantilever beam structure based on synthetic data generated from finite element models,and the results reveal that(i)applying the CMCM method in conjunction with iterative Guyan reduction approach can yield the best model updating,and(ii)employing a model reduction scheme always outperforms employing a modal expansion scheme.

关键词： Model updating damage detection damped systems incomplete complex modes

作者: S.-L. J. Hu F.S. Liu H.J. Li

作者单位: Department of Ocean Engineering,University of Rhode Island,Narragansett,RI 02882-1197,USA College of Engineering,Ocean University of China,Qingdao,China

会议类型: 国际会议

会议名称: The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)

会议地点: 重庆·南京

会议语种:英文

在线出版日期: 2007-05-01（万方平台首次上网日期，不代表论文的发表时间）