Finite element model updating of a truss model using incomplete modal data

摘要：

This paper presents an application of a two-step finite element model updating methodology to a 3D truss bridge model,with the inertial moment and elastic modulus as variables.First,the sensitivity of the change in modal parameters to variations in the physical parameters was analyzed.Based on these sensitivity analyses,the parameters that can be updated were determined.Next,the optimization of an orthogonallybased objective functional was employed in model updating using the modal data obtained from measurements on a physical structure.Sequential Quadratic Programming(SQP),a quasi-Newton approach that creates a linear search strategy applicable to non-linear minimization problems was used to acquire precise and stable solutions.In computing the solution,the gradients of every parameter versus the objective function were determined by executing a quadratic fitting method at each iterative step in order to improve the solution’s precision.The results of the experimental updating show that the analytical model is improved after model updating such that the natural frequencies from the finite element model better match the experimentally determined natural frequencies.

关键词： Model updating SQP linear search strategy modal data

作者: Y.X. Zhang S.H. Sim B.F. Spencer, Jr

作者单位: Civil Eng.Dept,Shanghai Normal University,Shanghai,201418,China Civil Eng.Dept,University of Illinois at Urbana-Champaign,Urbana,IL 61801,USA

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）