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A pretest planning method for model calibration for nonlinear systems

Yousheng Chen ; Andreas Linderholt ; Thomas Abrahamsson (Institutionen för tillämpad mekanik, Dynamik) ; Yuying Xia ; Michael I. Friswell
Conference Proceedings of the Society for Experimental Mechanics Series (2191-5644). Vol. 3 (2016), p. 371-379.
[Konferensbidrag, refereegranskat]

With increasing demands on more flexible and lighter engineering structures, it has been more common to take nonlinearity into account. Model calibration is an important procedure for nonlinear analysis in structural dynamics with many industrial applications. Pretest planning plays a key role in the previously proposed calibration method for nonlinear systems, which is based on multi-harmonic excitation and an effective optimization routine. This paper aims to improve the pretest planning strategy for the proposed calibration method. In this study, the Fisher information matrix (FIM), which is calculated from the gradients with respect to the chosen parameters with unknown values, is used for determining the locations, frequency range, and the amplitudes of the excitations as well as the sensor placements. This pretest planning based model calibration method is validated by a structure with clearance nonlinearity. Synthetic test data is used to simulate the test procedure. Model calibration and K-fold cross validation are conducted for the optimum configurations selected from the pretest planning as well as three other configurations. The calibration and cross validation results show that a more accurate estimation of parameters can be obtained by using test data from the optimum configuration.

Nyckelord: Clearance; Fisher information matrix; Multi-harmonic excitation; Nonlinear model calibration; Pretest planning



Denna post skapades 2016-12-19. Senast ändrad 2017-06-28.
CPL Pubid: 246276

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik (1900-2017)

Ämnesområden

Maskinteknik
Teknisk mekanik

Chalmers infrastruktur