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FINITE ELEMENT MODEL UPDATING FOR STRUCTURAL APPLICATIONS

Maria Girardi(maria.girardi***at***isti.cnr.it)
Cristina Padovani(cristina.padovani***at***isti.cnr.it)
Daniele Pellegrini(daniele.pellegrini***at***isti.cnr.it)
Margherita Porcelli(margherita.porcelli***at***unifi.it)
Laonardo Robol(leonardo.robol***at***isti.cnr.it)

Abstract: A novel method for performing model updating on finite element models is presented. The approach is particularly tailored to modal analyses of buildings, by which the lowest frequencies, obtained by using sensors and system identification approaches, need to be matched to the numerical ones predicted by the model. This is done by optimizing some unknown material parameters (such as mass density and Young’s modulus) of the materials and/or the boundary conditions, which are often only known approximately. In particular, this is the case when considering historical buildings. The straightforward application of a general-purpose optimizer can be impractical, given the large size of the model involved. In the paper, we show that, by slightly modifying the projection scheme used to compute the eigenvalues at the lowest end of the spectrum one can obtain local parametric reduced order models that, embedded in a trust-region scheme, form the basis for a reliable and efficient specialized algorithm. We describe an optimization strategy based on this approach, and we provide numerical experiments that confirm its effectiveness and accuracy.

Keywords: Model updating, Finite elements, Trust-region, Lanczos, Eigenvalue optimization

Category 1: Applications -- Science and Engineering (Civil and Environmental Engineering )

Category 2: Nonlinear Optimization

Citation: arXiv:1801.09122v2

Download: [PDF]

Entry Submitted: 02/06/2018
Entry Accepted: 02/06/2018
Entry Last Modified: 02/06/2018

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