DYNAMIC LOAD ASSESSMENT WITH OUT-PUT INFORMATION OF A SUBSTRUCTURE ONLY
It is commonly known that an incorrect finite element model with complex boundary conditions would lead to incorrect results in both the forward and inverse dynamic analysis of a structure.This scenario exists in most large structures with thousands of degrees-of-freedom.A large and complex structural system can,however,be divided into smaller substructures for separate study in the inverse analysis with the proposed method in this paper.Two different discrete algorithms,which are zero order hold discrete algorithm and first order hold algorithm,are investigated and studied.The dynamic load acting on a substructure as well as the interface forces of the substructure are evaluated based on measurements of acceleration and the first order hold discrete algorithm in state space.The external force may be applied at a fixed location or move on the structure.Compared to the zero order hold discrete method,the first order interpolation between sampling points gives more accurate solution to the equation in state space.The validation of the proposed method is demonstrated with polluted accelerations of a three-dimensional flat plate structure with good results.
Force identification zero order hold discrete algorithm first order hold discrete algorithm regularization substructure moving load
Y.Ding S.S.Law B.Wu B.Y.Zhao
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, P.R.China Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, P.R
国际会议
The Twelfth International Symposium on Structural Engineering (第十二届结构工程国际研讨会)
武汉
英文
752-757
2012-11-17（万方平台首次上网日期，不代表论文的发表时间）