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An Inverse Approach for the Determination of a Viscous Damping Model of Fibre Reinforced Plastic Beams using Finite Element Model Updating

by Subhajit Mondal (Author) Sushanta Chakraborty (Author)

Research Paper (postgraduate) 2014 11 Pages

Engineering - Plastics

Summary

Investigations have been carried out both numerically and experimentally to settle with a practically feasible set of proportional viscous damping parameters for the accurate prediction of responses of fibre reinforced plastic beams over a chosen frequency range of interest. The methodology needs accurate experimental modal testing, an adequately converged finite element model, a rational basis for correct correlations between these two models, and finally, updating of the finite element model by estimating a pair of global viscous damping coefficients using a gradient-based inverse sensitivity algorithm.

The present approach emphasises that the successful estimate of the damping matrix is related to a-priori estimation of material properties, as well. The responses are somewhat accurately predicted using these updated damping parameters over a large frequency range. In the case of plates, determination of in-plane stiffness parameters becomes easier, whereas for beam specimens, transverse material properties play a comparatively greater role and need to be determined. Moreover, for damping matrix parameter estimation, frequency response functions need to be used instead of frequencies and mode shapes. The proposed method of damping matrix identification is able to reproduce frequency response functions accurately even outside the frequency ranges used for identification.

Details

Pages
11
Year
2014
ISBN (Book)
9783668179417
File size
4.4 MB
Language
English
Catalog Number
v318609
Grade
Tags
inverse approach determination viscous damping model fibre reinforced plastic beams finite element updating

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Title: An Inverse Approach for the Determination of a Viscous Damping Model of Fibre Reinforced Plastic Beams using Finite Element Model Updating