基于汽车平顺性的新型半主动悬架研究

Research on a new semi-active suspension for improving ride performance

通过对车身加速度的频域分析,对车身加速度均方值相应进行了公式推导,提出了一种新型刚度和阻尼皆可变的半主动悬架;并且设计了其阻尼的控制算法。基于线性滤波法通过Simulink建立了路面输入模型,以四分之一车辆模型为基础通过AMESim和Simulink联合仿真平台在不同的路面上选取典型的速度区间对被动悬架、主动悬架以及提出的新式半主动悬架进行了模拟仿真比较。结果表明相比于主动悬架,在不良路面下,这种新型半主动悬架不仅减少了汽车的能量损耗;而且能够得到和主动悬架相近的性能。高速良好路面的时候,又能兼顾安全性,从整体上改善了汽车的平顺性。

A new semi-active suspension with variable stiffness and variable damping coefficient was presented to improve riding comfort.Mean square value of body acceleration was derived in the frequency domain.Road input model was established by Simulink based on linear filtering methods.Simulations for quarter car model have been implemented on AMESim/Simulink for the sake of comparison among the three systems,namely,active suspension,passive suspension and the new semi-active one.It has come to a conclusion that this new kind of system not only reduces the energy consumption,but also can hold a similar performance compared with active suspension that use skyhook method in bad road condition.When it comes to good road condition with higher speed,the new one can also improve driving stability.The new suspension system has improved the comfort of vehicles from the overall.