Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Differential Evolution method applied in parameter identification and model updating of flexible plate FEM model
Submission Author:
Yuri Andrade Dias Martins , SP
Co-Authors:
Yuri Andrade Dias Martins, Henrique Silveira
Presenter: Yuri Andrade Dias Martins
doi://10.26678/ABCM.COBEM2021.COB2021-0861
Abstract
The present work aims to study the dynamic behaviour of a thin steel square plate by means of theoretical and experimental analysis using the Finite Element Method (FEM) and Differential Evolution algorithm. The FEM by itself is capable of modelling with great accuracy a lot of physical structures, even those more complicated. Although it provides good predictions, when the matter is experimental measures there are some uncertainties associated with component geometry, materials constants and boundary conditions that lead to significant differences between experimental results and theoretical ones. In order to deal with this problem, model updating methods are widely used to minimize these discrepancies and, therefore, obtain an accurate model that truly represents the physical structure in analysis. In this context, this paper identifies unknown parameters that needs to be updated such as elasticity modulus, suspension stiffness and damping constants so that the Differential Evolution algorithm using multiple experimental and theoretical frequency response functions (FRFs) can find the best solution within a specified parameter range. The updated model is reliable enough to be used in further analysis like structural modification and substructuring. In the end, experimental and theoretical FRFs are compared to verify the quality of the fit. Furthermore, the Artificial Bee Colony updating method is compared to Differencial Evolution algorithm in order to discuss characteristics of both formulations envolved.
Keywords
Optimization method, modal analysis, Artificial Bee Colony
