Simulation Of Automotive CV Shafts And Its Software Platform Development

This paper taking automotive constant-velocity joint driveshaft as the research object, by building the multi-body and flexible body multi-body system dynamics model supporting for contact-impact analysis, under virtual prototyping environments developed CV shafts Simulation software platform that supports the contact and impact between components analysis, flexible coupling analysis, witch is of great significance for product designing and experiment.First, multi-body dynamics simulation theory and methods were studied and constant velocity drive shafts overall simulation strategy were proposed based on virtual prototype in this article. Geometric modeling of the system, the reference coordinates, the generalized coordinates, the definition of the class object so comprehensively and systematically described. Respectively, kinematics parameters of any point on the rigid and flexible body were given. The multi-body dynamics equations were established and the numerical algorithm of ADAMS were given. Finally on this basis, the overall CV shafts simulation strategy was put out. This strategy was not only suit for constant velocity drive shafts of the simulation analysis but also guided the general multi-body system dynamics simulation.With clearance deputy campaign dynamics simulation modeling was the key point of the constant velocity universal joint analysis. we used non-linear equivalent spring-damping describe the collision characteristics between components and based on the modified Coulomb friction model took into account of the effect in the gap. The searching algorithm of the contact collision point was proposed based on geometric features of the body and the discriminant equation of the collision detection was given. This model considered the normal contact force and tangential contact force between components at the gap, avoided cumbersome search process in the general contact problem and simulation results can verify the correctness of design, guide designing improvements.The treatment of flexible bodies was a key step in dynamics modeling of flexible coupling and pipes of the constant velocity drive shafts and rubber shaft support wre flexible bodies. In this paper, finite element method was adopt to discretize shaft to extract the modal information; the rubber flexible support was reduced to the equivalent spring damper model, taking into account of flexible supporting rigidity and damping characteristics, easy to carry out into ADAMS, while it was benefit for the development of simulation software platform.Finally, on the basis of the above, the use of secondary development on ADAMS software platform, developed a constant velocity drive shafts dedicated simulation system. The system has a visual, interactive, user-friendly interface, and for the system was developed based on ADAMS software,it can ensure numerical stability, accuracy and efficiency.