Proposição, avaliação numérica e experimental de um absorvedor dinâmico de vibrações multimodal

Detalhes bibliográficos
Ano de defesa: 2009
Autor(a) principal: Barros, Murilo Borges
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Uberlândia
BR
Programa de Pós-graduação em Engenharia Mecânica
Engenharias
UFU
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: https://repositorio.ufu.br/handle/123456789/14845
Resumo: Dynamic Vibration Absorbers (DVA) have been widely used for passive control of structural vibrations. In their simplest configurations, those devices have their mitigation capacity confined to narrow frequency bands, which limits, to a large extent, their practical effectiveness. In this work, it is proposed a methodology for the optimal design of a multimodal dynamic vibration absorber, intended to attenuate the amplitude levels around various resonance peaks simultaneously. The particular configuration considered is formed by blades containing circular disks in their tips. The optimization is performed taking into account design constraints. Moreover, the variability inherent to the construction of the base structure and of the DVA itself is considered aiming at obtaining robust designs in future studies. A technique for substructure coupling based on frequency response functions (FRFs) is used to evaluate the dynamic behavior of the coupled structure (base structure + DVA), given the FRFs of each substructure separately. The use of this technique enables the design of the DVA and the evaluation of its performance based solely on the use of experimental FRFs of the base structure, which makes numerical models unnecessary. Monte Carlo simulation is used to evaluate the influence of the uncertainties on the effectiveness of the multimodal DVA. The procedure is illustrated by numerical and experimental results obtained for a rectangular plate and hermetic compressor housing.