| Suspension is one of the main components of automobiles. It influences the ride comfort, drive smooth and control stability and so on. Variable rigidity and perfect inherent frequency of air suspension has greatly improved the using performance of automobiles, and received more and more attention. Meanwhile the development of the multi-body dynamics provide powerful tool for analyzing and designing automobile suspensions.The paper reviewed the development, present state of air suspensions and vehicle dynamics simulation technology in and aboard, summarized the multi-body dynamics theory, and introduced the main parts and characters of the software ADAMS, which based on the theory.Thoroughly introduced main components' structure form of air suspension, and their influences on the automobile performance. The paper compared the air spring with the torsion bar spring. Fully analyzed the structure, the rigidity characteristics, the frequency characteristic, the damping characteristic, the dynamic/ Static Characteristic and the using characteristic, emphasis the virtue of the air suspension.Based on the cooperation project "HFC6820KY Automobile Chassis Suspension System Design" with JiangHuai, the paper built the front suspension model and suspension-steering system model with the software - UG, then input the model to the Mechanical System Simulation software - ADAMS, and took the kinematic and dynamic simulation analysis. The simulation result is basically consistent with the actual state. After that, the paper optimized the structure and the performance parameters of the suspension. The optimization improved the sideway displacement of the wheel.The paper made structure intensity analysis to the key component of suspension-steering system with the finite element analysis software - ANSYS, provided the guidance for further improvement of the structure.
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