A carregar...
Publicação
Conceção e Análise de um Absorsor Dinâmico com Atuação em Diversos Graus de Liberdade
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 2.65 MB | Adobe PDF |
Autores
Orientador(es)
Resumo(s)
Com esta dissertação pretende-se estudar várias configurações que permitam anular as vibrações mecânicas de um certo mecanismo. Concretamente, definem-se como objetivos principais a identifica-ção de frequências para as quais se anularam as vibrações no ponto de aplicação da força e o estudo da sua variação com alteração de certos parâmetros.
A identificação de frequências que permitem anular as vibrações no ponto de aplicação da força constituem o principal foco do presente estudo e com recurso ao conceito de absorsor dinâmico, fre-quency response functions, FRF, e após elaborar o modelo numérico do mecanismo proposto no soft-ware Matlab, conclui-se que esse fenómeno pode decorrer de duas formas distintas. Através da escolha de antirressonâncias distintas, poderá imobilizar-se apenas o ponto de aplicação da força, ou poderá anular-se a translação e rotação do corpo onde se aplica a força.
De seguida, verifica-se a credibilidade dos resultados obtidos, comparando-os com os de um mo-delo experimental virtual idêntico elaborado no software Working Model. Desta comparação, pode con-cluir-se que os resultados se mostram válidos.
Por fim, elaboram-se gráficos de variação das frequências de antirressonância que permitem anu-lar as vibrações no ponto de aplicação da força conforme se altera vários parâmetros da configuração do mecanismo. Com base nos gráficos obtidos, podem definir-se parâmetros do mecanismo, sejam re-lacionados com a configuração do mesmo ou com a frequência da força aplicada.
This dissertation aims to study the impact of canceling mechanical vibrations on the configuration of a certain mechanism. Specifically, the main objectives are the identification of frequencies for which the vibrations at the point of application of the force are cancelled and the study of their variation with alteration of certain parameters. The identification of frequencies that cancel vibrations at the point of force application constitute the main focus of the present study. Using the concept of dynamic absorber, frequency response functi-ons, FRF, and after elaborating the numerical model of the mechanism proposed in the Matlab software, it is concluded that this phenomenon can occur in two distinct ways. By choosing different anti-reso-nances, one can immobilize only the point where the force is applied, or cancel the translation and rotation of the body to which the force is applied. Then, the credibility of the results obtained is verified, by comparing them with those of an iden-tical virtual experimental model created in the Working Model software. From this comparison, it can be concluded that the results are valid. Finally, graphs of anti-ressonance frequency variation are drawn up, which cancel out the vibra-tions at the point of force application as various parameters of the mechanism's configuration are chan-ged. Based on the graphs obtained, parameters of the mechanism can be defined, whether related to its configuration or the frequency of the applied force.
This dissertation aims to study the impact of canceling mechanical vibrations on the configuration of a certain mechanism. Specifically, the main objectives are the identification of frequencies for which the vibrations at the point of application of the force are cancelled and the study of their variation with alteration of certain parameters. The identification of frequencies that cancel vibrations at the point of force application constitute the main focus of the present study. Using the concept of dynamic absorber, frequency response functi-ons, FRF, and after elaborating the numerical model of the mechanism proposed in the Matlab software, it is concluded that this phenomenon can occur in two distinct ways. By choosing different anti-reso-nances, one can immobilize only the point where the force is applied, or cancel the translation and rotation of the body to which the force is applied. Then, the credibility of the results obtained is verified, by comparing them with those of an iden-tical virtual experimental model created in the Working Model software. From this comparison, it can be concluded that the results are valid. Finally, graphs of anti-ressonance frequency variation are drawn up, which cancel out the vibra-tions at the point of force application as various parameters of the mechanism's configuration are chan-ged. Based on the graphs obtained, parameters of the mechanism can be defined, whether related to its configuration or the frequency of the applied force.
Descrição
Palavras-chave
Frequência natural antirressonância amplitude de resposta anulação de vibrações