基于Simulink单气室油气悬架仿真分析

Simulation Analysis of Simulink-based Single-chamber Oil and Gas Suspensions

从单气室油气分离式油气弹簧的结构分析,根据工作原理建立油气弹簧刚度阻尼特性的数学模型和油气悬架二自由度振动模型,使用Simulink搭建仿真模型,分析油气弹簧的特性曲线,并在随机路面激励下得出悬架振动响应曲线。结果表明,油气弹簧具有初始阶段刚度变化小,随位移增大刚度变化大,以及伸张行程和压缩行程阻尼不同的特点,对比普通悬架振动响应曲线,车身加速度减小46.7%,车轮动载荷降低51.6%,油气悬架的整体性能优于普通悬架。

From the structural analysis of the single chamber oil-gas separating oil-gas spring,a mathematical model of the stiffness damping characteristics of the oil-gas spring and a two-degree-of-freedom vibration model of the oil-gas suspension are established according to the working principle,and a simulation model is built using Simulink to analyse the characteristic curves of the oil-gas spring and derive the suspension vibration response curve under random road excitation.The results show that the oil-gas spring has the characteristics of small change in stiffness at the initial stage,large change in stiffness with increasing displacement,and different damping for extension and compression strokes,and the overall performance of the oil-gas suspension is better than that of the ordinary suspension,with 46.7%reduction in body acceleration and 51.6%reduction in dynamic wheel load compared with the vibration response curve of the ordinary suspension.