中文摘要：

传统的阻尼可调减振器,主要通过改变节流口面积实现阻尼可调,工作模式比较单一,阻尼可调范围有限.为了增加阻尼可调的工作模式和调节范围,以某被动式液压减振器为基础,设计出一种具有多状态特性的阻尼可切换减振器.为了分析该减振器的性能,结合流体力学及热力学理论,建立了阻尼多状态切换减振器系统的数学模型,运用Simulink仿真分析了减振器输出力与减震器行程、频率的关系,并与减震器的台架试验结果进行对比验证.结果表明：阻尼力试验值与仿真值的偏差较小,所建的减振器数学模型具有较高的精度,且减振器阻尼状态变化明显,阻尼切换控制准确,为汽车半主动悬架的控制提供了理论依据.

英文摘要：

The adjustable damping of traditional damping adj by changing throttle opening area with single work mode and ustable shock absorber was limited damping adjustable achieved mainly range. In order to enhance the adjustable damping work mode and the adjustable range, a shock absorber with various state switching was designed based on a passive hydraulic shock absorber. In order to analyze the per- formance, a mathematical model for multi-levels-damping adjustable hydraulic shock absorber was estab- lished based on fluid mechanics and thermodynamics. The relation among shock absorber output force, piston travel and piston frequency was analyzed by Simulink simulation software and compared with the damping performance of adjustable shock absorber by bench test. The results show that the damping force deviation between test results and simulation results is small. The multi-levels-damping states of shock absorber change obviously with high switching control accuracy of damping state, which provides a basis for semi-active suspension control system.