Study On Simulation And Optimization For The Characteristic Of The Hydraulic Shock Absorber

Presently, the performance of the chassis decides whether the automotive products are recognized or not in the national and international market. Suspension design plays a key role as a major part of the chassis and is needed to be adjusted and re-designed frequently. As a major part of suspension, shock absorber and its damping performance have a direct impact on handling stability and riding comfort of the automotive. The traditional method of damper design is to obtaining parameters from plenty of tests based on the damping performance. Not only is design cycles long, but also the efficiency is low and the cost is high. Therefore, a type of approach is need to be established which could simulate the damping characteristics of the shock absorber, and obtain the parameters of shock absorber from the request characteristics of the damper.The main work is listed as follows:Firstly, beginning from the key point of calculating method, the model for calculating the stiffness of the superposed valves is established.Secondly, with the analysis of shock absorber structure and the adoption of fluent theory, the model of simulating characteristics of the damper is constructed, and some key factors are considered, such as the velocity of opening the valves, the limited height, the temperature and the pressure in the oil storage. and then, a simulation system for typical shock absorber is developed.Next, according to the request characteristic of damper, a design technique based on optimization is put forward and validated.In conclusion, the problem of parameterized flexible valve stiffness is solved in this thesis. The performance of damper under kinds of conditions can be predicted in the simulation model of damper, which considers its nonlinearity and non-convergence. The simulation result matches the experiment well. The design method based on optimization can be used in engineering projects. The research in this thesis will play an important part during the design process of shock absorber in future.