The Study Of Noise Mechanism Of Automotive Shock Absorber

Content: The noise of automotive shock absorber is the outer reflection of its' interior quality, it is also one of factors to effect automobile acoustics comfort. Therefore, the research on noise of automotive shock absorber is a good technical approach to promote the product quality, at the same time it can offer the theoretical basis to depress noise of shock absorber.The paper researches the mechanism of shock absorber's noise from three aspects. In the first place, the paper studies several typical damper's abnormal noises: the out performance distortion noise, low temperature noise, friction and strike noise and liquid throttling noise. The paper analyses the outer performance F~S curse, which is get from shock absorber test-bench, testing data on friction, shock absorber interior structure and the performance of shock absorber oil, through which paper concludes in the mechanisms of these typical damper's noises and several aspects to effect the damper's noise.In the second place, according to the research and testing data of Santana 2000's suspension system, the paper studies the noise of shock absorber occurring in the suspension system. Through analyzing the report on the suspension system's noise of Santana, the paper studies the relationship between vibration of shock absorber's connecting-rod and cylinder and noise of shock absorber, which testified that the noise of shock absorber is derived from vibration of shock absorber's connecting-rod. When the shock absorber's connecting-rod moves to the position, in which the compression cycle is just over and the rebound cycle is going to start, the connecting-rod would vibrate because of a sudden alteration of the shock absorber damping power. Meanwhile, the paper analyses the influence of vibration occurring in wheel sympathetic vibration and low temperature condition to noise.At last, the paper establishes the nonlinear dynamics model of suspension system and the parameter nonlinear dynamics model of a sort of shock absorber. The paper develops the simulation of the nonlinear dynamics model of suspension system, and the results of the simulation match well with those testing data. At the same time, the paper also researches the influence of valve parameters to performance and noise of shock absorber.