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Validation of a model calibration method through vibrational testing of a mechanical system with local clearance

Y. Chen ; A. Linderholt ; Thomas Abrahamsson (Institutionen för tillämpad mekanik, Dynamik) ; Y. Xia ; M. I. Friswell
Proceedings of Isma2016 International Conference on Noise and Vibration Engineering and Usd2016 International Conference on Uncertainty in Structural Dynamics, ED. BY Sas, P; Moens, D; VanDeWalle, A. p. 2581-2595. (2016)
[Konferensbidrag, refereegranskat]

Nonlinear finite element models are often validated using experimental data. A previously proposed calibration method, which concerns pre-test planning, multi-sinusoidal excitation and an effective optimization routine, is improved with an extended version of the pre-test planning. The improved method is validated using a test structure with a clearance type nonlinearity. From the pretest planning, an optimal configuration for the data acquisition is determined. The multi-harmonic nonlinear frequency response functions (FRFs) of the structure under test are then generated by a multi-sinusoidal excitation. Model calibration is conducted by minimizing the difference between the experimental multi-harmonic nonlinear FRFs and their analytical counterparts. The uncertainties of the estimated parameters are assessed by a k-fold cross validation, which confirm that the uncertainties of the estimated parameters are small when the optimal configuration is applied.

Nyckelord: NONLINEAR-SYSTEMS



Denna post skapades 2017-03-09.
CPL Pubid: 248508

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik

Ämnesområden

Maskinteknik

Chalmers infrastruktur