Publicação
Frictional contacts in multibody dynamics
| Resumo: | This work has as primary goal to study the influence of friction modeling on the dynamic behavior of mechanical systems. In this sense, an extensive literature review was conducted in order to present the main phenomena due to friction generated between two contacting surfaces. Furthermore, a comprehensive study of different friction modeling approaches was carried in order to explain the main characteristics of the most relevant static and dynamic friction models. The comparison between different methodologies of friction modelling is presented in two distinct phases. The first consists in a simple system with one degree of freedom where friction plays a major role in the behavior of the system. The second phase involves more complex three-dimensional mechanical systems, where just a small part of the presented models is employed. In the latter phase, it is analyzed a kinematic translational joint with friction, where the friction force is implicitly calculated in the resolution of the equations of motion, and a spatial revolute joint with axial and radial clearance where friction is treated as an external force acting on the system. Due to the use of multibody systems in the mentioned examples, it was necessary to introduce the three-dimensional formulation for their dynamic analysis, which in this case is based on the Newton-Euler equations. Some methods for solving the equations of motion are also discussed, as well as their efficiency and accuracy. The dynamic simulations of multibody systems performed in the context of this work were carried out using MUBODYNA (Flores, 2012). The main conclusion of this study is that friction plays a key role in the behavior of multibody systems due to its energy dissipation properties. The main differences between the existing models are in the vicinity of zero relative velocity, thus the disparities occur during motion reversal. |
|---|---|
| Autores principais: | Marques, Pedro Filipe Lima |
| Assunto: | Friction Multibody systems Contacts Simulation Atrito Sistemas multicorpo Contactos Simulação |
| Ano: | 2015 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | This work has as primary goal to study the influence of friction modeling on the dynamic behavior of mechanical systems. In this sense, an extensive literature review was conducted in order to present the main phenomena due to friction generated between two contacting surfaces. Furthermore, a comprehensive study of different friction modeling approaches was carried in order to explain the main characteristics of the most relevant static and dynamic friction models. The comparison between different methodologies of friction modelling is presented in two distinct phases. The first consists in a simple system with one degree of freedom where friction plays a major role in the behavior of the system. The second phase involves more complex three-dimensional mechanical systems, where just a small part of the presented models is employed. In the latter phase, it is analyzed a kinematic translational joint with friction, where the friction force is implicitly calculated in the resolution of the equations of motion, and a spatial revolute joint with axial and radial clearance where friction is treated as an external force acting on the system. Due to the use of multibody systems in the mentioned examples, it was necessary to introduce the three-dimensional formulation for their dynamic analysis, which in this case is based on the Newton-Euler equations. Some methods for solving the equations of motion are also discussed, as well as their efficiency and accuracy. The dynamic simulations of multibody systems performed in the context of this work were carried out using MUBODYNA (Flores, 2012). The main conclusion of this study is that friction plays a key role in the behavior of multibody systems due to its energy dissipation properties. The main differences between the existing models are in the vicinity of zero relative velocity, thus the disparities occur during motion reversal. |
|---|