纯电动汽车前悬架设计与仿真分析

为缩短纯电动车前悬架设计的开发时间与减少开发成本,文章利用汽车设计理论对前悬架系统中悬架主要总成件进行设计,利用Adams软件对已设计的前悬架系统进行建模和动力学仿真,分析悬架性能是否符合要求。设计出悬架系统并装车试验,性能良好。,该方法可以减少样品试制的时间与成本。     

麦弗逊式前悬架液力减振器阻尼特性仿真与试验

分析了某轿车麦弗逊式前悬架液力减振器的结构特点,建立了该减振器阻尼特性的数学模型,分别采用钱氏摄动法和有限元法计算减振器节流阀片的挠曲变形,通过仿真计算得到了相应的减振器阻尼特性,通过台架试验进行了减振器样件的阻尼性能测试。对比分析表明:仿真结果与试验结果基本一致,验证了减振器阻尼特性数学模型的有效性;根据有限元法计算的阀片变形所预测的减振器阻尼特性更接近试验值,研究结果有利于提高液力减振器阻尼特性的计算精度。     

麦弗逊悬架系统仿真分析应用研究

汽车悬架类型的选择和悬架参数的差异对汽车的操纵稳定性和行驶平顺性具有重要的影响。主要分析了麦弗逊悬架的结构特点,并通过CATIA和ADAMS软件建立麦弗逊悬架的3D模型,对其进行仿真分析,得出悬架参数的优化设计方法。     

New model and simulation of Macpherson suspension system for ride control applications

The main purpose of this paper is to propose a new nonlinear model of the Macpherson strut suspension system for ride control applications. The model includes the vertical acceleration of the sprung mass and incorporates the suspension linkage kinematics. This two-degree-of-freedom (DOF) model not only provides a more accurate representation of the Macpherson suspension system for control applications in order to improve the ride quality, but also facilitates evaluation of the suspension kinematic parameters, such as camber, caster and king-pin angles as well as track alterations on the ride vibrations. The performances of the nonlinear and linearised models are investigated and compared with those of the conventional model. Besides, it is shown that the semi-active force improves the ride quality better than active force, while the opposite is true in terms of improving the performance of the kinematic parameters. The results of variations of the kinematic parameters based on the linear model subject to road disturbances are compared with those of a virtual prototype of Macpherson suspension in ADAMS software. The analytical results in both cases are shown to agree with each other.     

控制臂改进型麦弗逊悬架运动学性能研究

利用多体动力学理论,在虚拟样机仿真软件ADAMS/Car中建立了传统型麦弗逊悬架及控制臂改进型麦弗逊悬架模型.通过运动学仿真计算可知、在车轮上、下跳动过程中,改进型麦弗逊悬架使车轮外倾角、车轮前束、主销内倾角,车轮转角、抬头量和点头量的变化范围更小,主销后倾角变化范围稍大,更有利于操纵稳定;与传统型麦弗逊悬架相比,控制臂改进型麦弗逊悬架运动学性能有明显提高.     

An efficient sensitivity analysis method for modified geometry of Macpherson suspension based on Pearson correlation coefficient

The main purpose of this paper is to propose a new method for designing Macpherson suspension, based on the Sobol indices in terms of Pearson correlation which determines the importance of each member on the behaviour of vehicle suspension. The formulation of dynamic analysis of Macpherson suspension system is developed using the suspension members as the modified links in order to achieve the desired kinematic behaviour. The mechanical system is replaced with an equivalent constrained links and then kinematic laws are utilised to obtain a new modified geometry of Macpherson suspension. The equivalent mechanism of Macpherson suspension increased the speed of analysis and reduced its complexity. The ADAMS/CAR software is utilised to simulate a full vehicle, Renault Logan car, in order to analyse the accuracy of modified geometry model. An experimental 4-poster test rig is considered for validating both ADAMS/CAR simulation and analytical geometry model. Pearson correlation coefficient is applied to analyse the sensitivity of each suspension member according to vehicle objective functions such as sprung mass acceleration, etc. Besides this matter, the estimation of Pearson correlation coefficient between variables is analysed in this method. It is understood that the Pearson correlation coefficient is an efficient method for analysing the vehicle suspension which leads to a better design of Macpherson suspension system.