| With the continuous improvement of people’s material and cultural life level, the performance of vehicles (especially cars is also presented demands of (car reliability, power, economy, stability, safety, comfortable, comfort and so on) higher. The shock absorber is one of the most important parts in the automobile suspension system, its dynamic performance directly affects the performance of the vehicle ride comfort, stability, etc.. So the performance of automobile shock absorber has also put forward new and higher requirements:shock absorber have better dynamic characteristics. However, industry is industry of our country automobile vibration damper design and development level and the developed countries of the design and development of the level of the gap is still relatively large. I am in shock absorber design development level is also limited to the traditional design method of trial experiment on. With this method, the design and development of shock absorber, long cycle, high cost, has been unable to meet the needs of the current auto parts industry competition. Therefore, it is urgent to explore a new method of simulation analysis and design of automobile vibration absorber based on computer simulation technology.This subject to a certain type of car double cylinder charging type hydraulic shock absorber as the research object. On the structure characteristics, working process and dynamic damping characteristics are analyzed. Through the physical dismantling of Surveying and mapping, the establishment of three-dimensional flow field model, using computational fluid dynamics, computational fluid dynamics (CFD) method for simulation analysis calculation of shock absorber internal flow field distribution, the simulation results with the experimental results consistency well. The results showed that the established 3-D internal flow field model is correct. Calculation and analysis of shock absorber often through hole size, throttle valve opened, throttle valve diameter, piston rod diameter, gas species, gas quantity and gas pressure and other factors on the dynamic performance of the shock absorber effect by using the simulation model. At the same time, the two-way flow and solid coupling model is established, and the effect of the throttle valve on the dynamic performance is analyzed. In order to provide some reference for the design and development of the vibration damper in practical engineering.The main work of this paper is as follows:(1) Firstly, the domestic and foreign research situation of the shock absorber, and defects in China traditional shock absorber design method, based on computer simulation analysis method to study the shock absorber to determine;(2) Changeable for damper structure complex and internal flow field, the were certain assumptions and simplification of and the establishment of the shock absorber internal 3D flow field model, the simulation results and the bench test results of that simulation calculation and experimental results of small deviation, to meet the needs of practical engineering;(3) The effects of the basic structural parameters such as the size of the damper, the diameter of the piston rod and the maximum opening of the throttle valve on the dynamic characteristics are studied in detail;(4) By using two phase flow simulation method, the effects of the gas filled with gas on the dynamic characteristics of the shock absorber are simulated and analyzed in detail;(5) This study is the valve type shock absorber, shock absorber valve for deformation, shock absorber of a two-way flow solid coupling model is established. The results prove that the method has higher precision than finite element method and one-way fluid solid coupling method, and analyzes the factors that influence the dynamic characteristics of the shock absorber valve stiffness, throttle valve between the friction coefficient. |
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