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Experimental validation of a nonlinear model calibration method based on multiharmonic frequency responses

Yousheng Chen ; Andreas Linderholt ; Thomas Abrahamsson (Institutionen för tillämpad mekanik ; Institutionen för tillämpad mekanik, Dynamik ; Svenskt VindkraftsTekniskt Centrum (SWPTC))
Journal of Computational and Nonlinear Dynamics (15551415). Vol. 12 (2017), 4, p. Article number 410141.
[Artikel, refereegranskad vetenskaplig]

Correlation and calibration using test data are natural ingredients in the process of validating computational models. Model calibration for the important subclass of nonlinear systems which consists of structures dominated by linear behavior with the presence of local nonlinear effects is studied in this work. The experimental validation of a nonlinear model calibration method is conducted using a replica of the Ecole Centrale de Lyon (ECL) nonlinear benchmark test setup. The calibration method is based on the selection of uncertain model parameters and the data that form the calibration metric together with an efficient optimization routine. The parameterization is chosen so that the expected covariances of the parameter estimates are made small. To obtain informative data, the excitation force is designed to be multisinusoidal and the resulting steady-state multiharmonic frequency response data are measured. To shorten the optimization time, plausible starting seed candidates are selected using the Latin hypercube sampling method. The candidate parameter set giving the smallest deviation to the test data is used as a starting point for an iterative search for a calibration solution. The model calibration is conducted by minimizing the deviations between the measured steady-state multiharmonic frequency response data and the analytical counterparts that are calculated using the multiharmonic balance method. The resulting calibrated model's output corresponds well with the measured responses. Copyright © 2017 by ASME.

Nyckelord: Fisher information matrix; identifiability analysis; multiharmonic frequency response; Nonlinear model calibration



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Denna post skapades 2017-03-08.
CPL Pubid: 248471

 

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