车速变化对车辆平顺性的影响  

Influence of velocity change on ride comfort for vehicle

作　　者：周玉财 陈士安[2] 何仁[2] 

机构地区：[1]青海交通职业技术学院汽车工程系,青海西宁810003 [2]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《长安大学学报（自然科学版）》2013年第3期94-99,105,共7页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(50805066);江苏省自然科学基金项目(BK2008553)

摘　　要：为研究车速变化对车辆平顺性的影响,建立了考虑车速变化时纵向惯性力影响与白噪声频率时变的路面随机输入1/2车悬架动力学模型。其中,白噪声频率时变的路面输入模型是利用Matlab/Simulink软件的Lookup Table模块,针对实时的车辆行驶距离对空间路面随机激励模型查表来获得。数值仿真结果表明:车速变化对轮胎动变形、簧载质量加速度及车身俯仰角加速度指标基本没有影响,但使悬架动挠度指标明显变差,且车速变化越剧烈及悬架刚度越小,上述现象越明显。采用减小车辆质心至0.8倍与增大悬架刚度至1.1倍的改进时,牺牲簧载质量加速度指标6.96%和车身俯仰角加速度指标0.89%,可使前后悬架动挠度指标分别得到20%与17.6%的明显改善。In order to study the influence of velocity change on vehicle ride comfort,taking the influence of longitudinal inertia force and time-variant white noise frequency from vehicle velocity change into account,a suspension dynamic model of 1/2 vehicle was established with road random inputs.The time-variant white noise frequency model was obtained by using the Lookup Table Module in the Matlab/Simulink Software with road by the real-time vehicle speed.The results show that velocity change makes the index of suspension deflection become worse obviously but has no influence on the indexes of tire deflection,sprung mass acceleration and body pitching angle acceleration.The bigger the change of vehicle speed and the less the suspension stiffness,the more obvious the phenomena above.When the height of mass centre is decreased by 20% and the stiffnesses of all springs are increased by 10%,the vertical and pinching acceleration indexes increase by 6.96% and 0.89% respectively,and the front and rear suspension deflection indexes decrease by 20% and 17.6% respectively.5 tabs,10 figs,18 refs.

关 键 词：汽车工程 平顺性 车速变化 路面输入 频率 时变性 

分 类 号：U461.4[机械工程—车辆工程]