具有附加腔室汽车减振器阻尼特性的仿真

Simulation of Damping Characteristics of Automobile Shock Absorber with Additional Chamber

针对现有双筒液压减振器的阻尼特性数学模型不足以全面分析具有附加腔室汽车减振器阻尼特性这一问题,基于缝隙流动、管嘴流动、薄壁小孔流动、细长孔流动,运用串联流体和并联流体等理论,建立了具有附加腔室汽车减振器的阻尼力数学模型。根据建立的数学模型,运用ADAMS/hydraulics对所述减振器进行阻尼特性仿真和实验,研究结果验证了具有附加腔室汽车减振器模型的正确性。附加腔室的长度对阻尼影响不明显,但可显著地影响减振器的开阀行程。所建模型可为具有附加腔室汽车减振器的设计和性能预测提供理论依据。

Aiming at the problem that the existing mathematical model on damping characteristics of double cylinder hydraulic shock absorber is not enough to comprehensively analyze the damping char-acteristics of automobile shock absorber with additional chamber,a mathematical model of damping force of automobile shock absorber with additional chamber is established based on the theories of slot flow,nozzle flow,thin-walled small hole flow and elongated hole flow,and by using series fluid and parallel fluid.According to the established mathematical model,the damping characteristics of the shock absorber are simulated and tested by ADAMS/hydraulics.The research results verify the cor-rectness of the shock absorber model with additional chambers.The length of the additional chamber has no obvious effect on the damping,but it can significantly affect the valve opening stroke of the shock absorber.The model can provide theoretical basis for the design and performance prediction of automotive shock absorber with additional chamber.