Update of coarse finite elements structural models for dynamic analysis identified from reference responses
by Tiago M. Rocha; José F.B. Meireles; António C.M. Pinho; Jorge A.C. Ambrósio
International Journal of Mechatronics and Manufacturing Systems (IJMMS), Vol. 4, No. 5, 2011

Abstract: Finite element modelling of systems with structural and mechanical joints, geometric details, materials with environmental dependent properties, among others, requires a higher model complexity and large computation time. Finite element updating techniques aim at improving the models by increasing their accuracy without increasing their size. This work proposes an approach to finite element updating based on the minimisation of the modal assurance criteria matrix. The objective is to identify a model for which the natural frequencies and mode shapes match those of a reference model. The model material and geometric properties are the design variables being the sequential quadratic programming the optimisation method used. The non-convexity, and eventual discontinuity, of the design space leads to many local minima. This work proposes a search strategy for the initial values of the design that covers the feasible space being the global minimum identified among the different minima obtained from each optimisation problem.

Online publication date: Sat, 07-Mar-2015

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