Performance Analysis And Optimization Of Macpherson Suspension Based On Multiody Method

McPherson suspension is widely used in vehicle’s front suspension. Its hard-point arrangement will affect the performance of the suspension and steering system, even the vehicle’s performance.Therefore, to do research on Mc Pherson suspension is of great significance. Based on the theory of Multi-body Dynamics, treating Mc Pherson suspension and the steering system of a light vehicle as a whole, the performance analysis and the optimization of hard points by using Genetic Algorithm in MATLAB is done. The main contents are as follows:1. A light vehicle Mc Pherson suspension and steering assembly which is studied as a whole is established via using ADAMS /Car. During every step of wheel bounce and rebounce, steering test and the evaluation of steering performance must be done. Subequently the parallel wheel travel is done in order to check wheel alignment. At the same time, studying the impact factors of Ackerman error is needed.2. Based on the theory of Multi-body Dynamics, through programming in MATLAB to establish the kinematic model. According to the overall distribution of Ackerman error in different steering angle, the weight function based on the cosine function is introduced. The optimization of hard points is done by using Genetic Algorithm.3. The optimized model is established in ADAMS/Car, the steering test is done to validate the Ackerman error and the steering performance and the parallel wheel travel is done to validate the wheel alignment, which proves the method is reasonable and feasible.In this paper, based on Multi-body Dynamics, the Mc Pherson suspension and steering system as a whole to research and the optimization method of MATLAB programming will provide referencr basis for the study of Mc Pherson suspension.