Performance Simulation-based On Virtual Instrument Of Dual-tube Gas Charged Damper

Shock absorber, as one of the important parts in the suspension system, influences the full vehicle comfortableness, the operation stability, security and so on. The dual-tube gas charged shock absorber is the mainstream product of the shock absorber. Accurately simulating its resistant characteristic is always the automobile shock absorber technological development main topic.Up to the present, because the valves'deformation problem is based on the classical small deflection theory, the analytical models at home and abroad cannot simulate its characteristic accurately. Qian-perturbation is used to solve the problem of large deflection of circular thin plate under uniformed load. Fluid and elastic mechanics'relative theorem is also used to set up shock absorbers' parameterized mathematical model on Toyota HaishiG278. And then in the programming environment LabVIEW, combined with the continuing development interface of MATLAB, simulated shock absorber's out performance( indicator and velocity performance ) more accurately. At the same time, a general automobile shock absorbers'test system is developed under the auxiliary equipment force sensor and displacement sensor by the mechanical indicator test rig. The comparision between simulation curve and experimental curve indicates that simulation curve conforms well with the experimental curve. Otherwise, the influence of charged gas to the performance is also discussed. Critical velocity of shock absorber could be up to 3m/s under the gas pressure of 0.6~0.8MPa.In a word, the development period of products is hortened greatly by the application of virtual instrument.