Estudo de técnicas para a determinação da matriz de amortecimento em sistemas estruturais
This work aims at applying methods to determine the damping matrix structures, building on the work theoretically developed by Adhikari (2000) and Pilkey (1998). The buffer is used in monitoring structures aids in controlling vibration of mechanical systems, crack propagation control in the material...
| Autor principal: | Garbin, Nayane Lais Schran |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/15131 |
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| Resumo: |
This work aims at applying methods to determine the damping matrix structures, building on the work theoretically developed by Adhikari (2000) and Pilkey (1998). The buffer is used in monitoring structures aids in controlling vibration of mechanical systems, crack propagation control in the materials influences the tuning modes of vibration and reducing energy dissipation rate structures. Moreover, it is extremely important in reducing noise and vibration levels on various metal structures. For these, among other reasons, it is extremely important to study the damping in mechanical systems. The methodology to estimate the damping matrix works with a semi-empirical analysis based on the results of numerical simulation via finite element method and experimental modal analysis. The mass and stiffness matrices used in the methodology are determined by finite element method, and the eigenvalues and eigenvectors are coming from an experimental modal analysis. The main difficulty of this methodology is working with differing order experimental model since the finite element method matrix has a much higher order than the techniques used experimentally. Thus a model reduction method was used for troubleshooting. In order to enable the application of methods had been used as a case study a system composed of a cantilever beam at one end attached by a walrus and other free where an external excitation in the system has been applied. Are determined the physical and geometrical parameters of the system and preparatory techniques applied for the determination of damping in this structure from the application of methods for determining the damping discussed later. Therefore, there are obtained the results mass and rigidity of the system, as well as the intrinsic damping material, both expressed in matrix form. With these it can determine the general equation of motion of the system, which are the ultimate goals of the work. |
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