FEM calibration with FRF damping equalization
Paper in proceedings, 2014
A finite element model calibration procedure that uses frequency response function data and relies on damping equalization is presented. In this, the dampings of the finite element model and the corresponding experimental model are set equal before calibration. The damping equalization is made to avoid the mode pairing problem that normally needs to be solved in other model updating procedures. It is demonstrated that one particular use of frequency response data gives a calibration deviation metric that is smooth in the variation of model parameters and give a large radius of convergence to the calibration minimum. The method is combined with model reduction for increased speed and employs a minimizing procedure that employs randomized multiple starting points in the parameter space to get to the calibration solution. The performance of the calibration procedure is demonstrated by two numerical examples. © The Society for Experimental Mechanics, Inc. 2014.
Calibration procedure
Mode-matching-free comparison
Experimental modeling
Frequency response
FE model calibration
Structural dynamics
Calibration solutions
Finite element method
Damping
Equalizers
Damping equalization
Finite element model calibrations
Mode matching
Radius of convergence
Frequency response functions
FE model
Frequency response calibration