双气室液压互联悬架系统特性研究

An Investigation on the Characteristics of Hydraulically Interconnected Suspension System with Dual Accumulators

为改善车辆动态性能,设计一种双气室液压互联悬架系统。结合结构特征建立双气室液压互联悬架模型,得到包含该模型的整车动力学模型,并利用蛇行试验结果进行验证。将分别装有双气室、单气室的液压互联悬架与原机械悬架的整车模型在不同运动模态下进行仿真,对比分析三者对车辆悬架系统刚度与阻尼特性的影响,并在时域和频域分析三者对车辆响应的影响。结果表明,双气室液压互联悬架能显著提高车辆侧倾模态的刚度与阻尼,但对俯仰与垂向模态的刚度与阻尼影响较小;在蛇行工况下,该悬架能有效减小车辆侧倾角及其角速度与悬架动挠度,改善车辆操纵性能;在随机路面工况下,该悬架对行驶平顺性的影响很小,并能改善道路友好性。

A hydraulically interconnected suspension system with dual accumulators(DHIS)is proposed to improve vehicle dynamic performance.The model for DHIS system is established according to its structure characteristics and then the entire vehicle model including the proposed model is derived and verified with experimental results under sine-wave maneuver.The whole vehicle models installed respectively with hydraulically interconnected suspension with dual accumulators,single accumulator and the original mechanical suspension system are simulated under different motion modes,the influence of which on the stiffness and damping characteristics of the DHIS system,hydraulically interconnected suspension(HIS)system and the original mechanical suspension system on the vehicle model is compared and analyzed,followed by the vehicle performance analyses for the three types of suspension system in both time-and frequency-domains.Simulation results show that the roll stiffness and roll-damping coefficient are significantly enhanced with DHIS system,but those in pitch and bounce motion modes slightly affected.Under sine-wave steering,the roll angle,roll rate and suspension deflection are decreased effectively with DHIS system,which hence enhance vehicle handling performance;and under the condition of random road surface,the ride comfort is slightly affected,and the tire-road friendliness can be effectively improved.