Update of FRF matrix and physical parameters of finite element model

作者：Lee Eun Taik; Kim Kijong; Eun Hee Chang^*

来源：Journal of Vibroengineering, 2013, 15(1): 254-264.

• FRF
• constraint
• measurement
• parameter matrix
• dynamic stiffness matrix

Numerically simulated results by finite element model of a dynamic system do rarely coincide with the actual responses of the structure due to the modeling, manufacturing errors or other causes. The parameters of the finite element model should be corrected for subsequent proper analysis. Minimizing a cost function by the difference between the analytical and actual dynamic stiffness matrices along with constrained conditions of measured FRFs (Frequency Response Functions), this work provides the mathematical form on the updated FRF. The updated parameter matrices of the structure are derived from the FRF variation within the prescribed frequency range. It is shown that the exactness of the proposed method depends on the number of the measured data. The validity of the proposed method is illustrated in updating the parameter matrices of a planar truss structure.

• 出版日期2013-3