混联ISD悬架寄生阻尼和附加刚度对性能的影响分析

为了将混联ISD悬架工程化,提出一种液力惯容器和油气弹簧结合的混联ISD悬架设计方案.针对工程化过程中产生的寄生阻尼和附加刚度可能会恶化悬架性能的问题,建立包含惯容器寄生阻尼和油气弹簧附加刚度在内的1/4工程化混联ISD悬架模型.通过仿真计算,分析寄生阻尼和附加刚度对悬架性能的影响,并利用多目标优化方法,对寄生阻尼和附加刚度进行优化设计.结果表明,与混联ISD悬架相比,工程化混联ISD悬架的车身加速度、悬架动行程和轮胎动载荷功率谱密度低频共振峰值分别下降了9.1%,65.9%,11.8%,均方根值分别降低了1.6%,3.9%,1.1%.可见,在混联ISD悬架的工程化设计中,通过优化设计,将寄生阻尼和附加刚度控制在合理水平,能使工程化前后悬架性能基本一致. 

Influence of the Parasitic Damping and Additional Stiffness on the Hybrid-Connected ISD Suspension

In order to engineer the hybrid-connected ISD suspension, a design scheme was proposed in combination with hydraulic inerter and a hydro-pneumatic spring. In allusion to the problem that the parasitic damping and the additional stiffness produced in engineering may worsen the suspension performance, a quarter vehicle dynamics mathematical model was built. The impact of the parasitic damping and the additional stiffness on the suspension performance was analyzed by the simulation, and a muti-objective optimization method was used to optimize the design of the parasitic damping and the additional stiffness. The results indicate that the low frequency peak value of the power spectral density of the body acceleration, the suspension working space, and the dynamic tyre load of the engineering hybrid-connected ISD suspension decrease respectively 1.6%, 3.9%, 1.1% compared with the hybrid-connected ISD suspension. And their RMS value decrease 12.2%, 11.4%, 8.6% compared with the hybrid-connected ISD suspension. Therefore, it is necessary to limit the parasitic damping and the additional stiffness to a reasonable range by optimization design to make the suspension performance essentially constant before and after engineering. The research can provide theoretical basis for the engineering design of the hybrid-connected ISD suspension.