| Suspension is one of the most important systems in a car, which radically affect the driving performance and security. With the developing of the mathematics and computer technology, the design of the modern car is toward to the direction of modular and virtualization, that has effectively reduced the costs and speeded up the Cycle; even strengthen the safety of all parts.Because of the complexity of the suspension structure, it is difficult to calculate the loading, even the experiments are also hard.but the computer and multi-body dynamics model can effectively solve the problems. This paper build the front suspension and rear leaf suspension multi-body dynamics based on ADAMS/CAR, it uses the three-link equivalent model to set up the leaf spring suspension and then verified the model with the suspension K&C data which could keep the accuracy of the model. on this bases, this thesis research the statics of suspension and calculate the loading of hard points under four limit condition as braking condition, twist condition, pothole condition and corning(RH) condition.Through the finite element processing with the HYPERMESH for the front Macpherson suspension, this paper make the structural strength analysis under the boundary loading, and then calculate the maximum stress in the knuckle and the arm in order to proof that the suspension has the ability to lightweight. After that this paper improved the knuckle and arm structure, contrast the maximum stress and strain and the whole suspension deformation, it verity the feasibility of the structure improvement.After the research of this thesis, we can set up the process of chassis dynamics analysis and lightweight based on multi-body and finite element, which could play good effect on the suspension design and structure of improvement and has a wide range of engineering research function. At the same time it also can be applied to the body strength analysis and stiffness analysis. |
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