Ajuste de modelos numericos usando funções de resposta em frequencia

AUTOR(ES)

Nivaldo Benedito Ferreira Campos

DATA DE PUBLICAÇÃO

2002

RESUMO

This work analyses numerical models updating techniques using simulated frequency response functions (FRFs) as experimental data. The usual techniques of finite element models (FEM) updating, those based on direct updating of model matrices, and those based on iterative methods are presented. The use of the iterative methods was investigated initially for FEM, using modal data as well as FRFs. The use of FRFs have been proved particularly interesting due to the amount of information about the structure s dynamic behavior that it provides and because it allows the use of experimental data without the need of modal data extraction and the consequent error introduction. The same procedure was used to update numerical models that need discretization only over the boundary of the problem under study. The boundary element model updating was investigated, and the procedures to obtain the FRFs by this method. A beam like structural element was updated and the results obtained were compared to that from FEM. Finally, it was investigated the use of the scaled boundary finite element method. Its formulation for elastodynamics in the two- and three-dimensional cases is presented, and a technique to obtain the FRFs is proposed and verified. A plane thin plate formulation to scaled boundary finite element method is proposed and some considerations about obtaining the corresponding dynamic stiffness matrix are discussed

ASSUNTO(S)

metodo dos elementos finitos metodos de elementos de contorno estimativa de parametros

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