横向稳定杆计算与汽车侧倾

主要阐述了与汽车横向稳定性有关的几个问题：横向稳定杆的设计：悬架侧倾角刚度及前后悬架侧倾角刚度的匹配：汽车侧倾轴线的确定及汽车侧倾角计算。讨论了提高汽车悬架侧向稳定性。     

全承载客车侧倾优化及空心稳定杆的应用

正随着人们对乘坐舒适性要求的提高,近现代车辆悬架一般设计得比较软,在高速行驶转向时,车身会产生很大的横向侧倾和横向角振动。因此,杆式横向稳定器应运而生,并以成本低和结构简单而得到广泛应用。横向稳定杆对悬架侧倾角刚度的分配有很大影响,一般要求当侧向惯性力等于0.4倍的车重时,车身的侧倾角小于6度,同时为了满足汽车稍有不足转向特性的要求,前后悬架的侧倾角刚度比值一般取     

一种新型主动横向稳定杆装置的设计与特性分析

针对传统被动横向稳定杆不能根据车辆的侧倾角大小来调整车辆的侧倾角刚度,导致车辆在高速大转角时容易发生侧翻的问题,设计了一种新型的刚度可调式主动横向稳定杆(AARB)装置。建立了该AARB装置的侧倾角刚度数学模型,分析了各结构参数对该侧倾角刚度特性的影响规律。最后,通过试验验证了该主动横向稳定杆能比被动横向稳定杆更有效地控制车辆的侧倾,防止车辆发生侧翻。     

空气悬架横向稳定杆角刚度影响因素分析

文中研究了悬架角刚度不足情况下根据整车角刚度要求确定横向稳定杆角刚度的一般方法,然后利用有限元分析技术研究了影响U型横向稳定杆角刚度的一些设计参数及其对角刚度的定性的影响。     

轻型商用车后横向稳定杆设计分析

针对某轻型商用车后横向稳定杆与备胎干涉问题进行分析,在保证整车角刚度需求的前提下,根据布置空间匹配设计新型后稳定杆结构,应用OptiStruct求解器进行求解,选取合适的横向稳定杆直径,使新设计的后续稳定杆提供的侧倾角刚度与原横向稳定杆基本一致。     

横向稳定杆性能计算及其影响因素分析

基于对横向稳定杆的受力分析,推导出其等效在车轮处的侧倾角刚度,给出了稳定杆截面相当应力的计算公式和最大应力横截面的位置。求出了悬架在最恶劣工况下横向稳定杆的强度条件,进一步分析了稳定杆安装位置和结构参数对其侧倾角刚度和最恶劣工况下应力的影响,并提出了横向稳定杆的若干设计要点。     

某越野车车身稳定系统匹配设计与试验研究

过硬的横向稳定杆会限制车辆的越野能力,因此某些车型为了保障越野能力而选用较软的横向稳定杆,便导致了越野车侧倾刚度不足的问题。针对这一问题设计了一套可取代横向稳定杆的车身稳定系统,用于在不影响车辆越野性能的同时增加车辆的侧倾刚度。通过建立整车及液压系统动力学模型进行数值运算仿真,以求得能和整车匹配的车身稳定系统的关键参数。然后根据该车的底盘结构对系统进行结构设计,并开发出了原型样机进行装车试验。通过对原装越野车和改装越野车进行悬架性能试验、蛇行试验和平顺性试验,并对结果作对比分析,验证了车身稳定系统可以大幅度提高车辆动态侧倾刚度,改善其操纵稳定性且并不影响平顺性。     

五连杆非独立后悬架侧倾性能研究

运用动静法创建了稳态回转时五连杆后悬架的侧倾平面模型运动方程,运用矢量几何法分析了车体侧倾角和横向推力杆方向角之间的关系。通过对某SUV车实例分析,得出了不同的几何位置下车体侧倾角、有效侧倾刚度及侧倾中心位置的变化。结果表明,当车辆稳态回转时,横向推力杆的长度及方向角、上拉杆的布置对悬架的侧倾特性有重要影响;仿真结果与道路试验结果在趋势上有较好的一致性。     

厢式轻型货车侧倾稳定性研究分析

文章以车辆使用工况为出发点,分析了悬架影响侧倾稳定性的因素,对侧倾稳定性影响机理进行了理论分析。利用理论基础,以实例设计验证,结合仿真建模及分析和试验测试,对三者的数据进行对比分析,证明理论设计方案的可行性和仿真分析的可行性。分析出了影响车辆侧倾角的主要悬架参数,增加横向稳定杆、调整板簧距离、降低质心高度是改善车辆侧倾角的有效途径。     

基于adams/view的重型越野车横向稳定杆设计

针对某双横臂式独立悬架KC特性已初步确定的重型越野车,校核其侧倾角刚度,并对该车前桥横向稳定杆进行设计计算。随后利用adams/view对整车的操纵稳定性进行仿真分析和实车试验验证。研究表明,试验与仿真结果相一致,与设计要求相符,表明该横向稳定杆的设计合理。基于仿真方法进行整车操纵稳定性分析对以后的设计有着重要的指导意义。     

提高商用车操纵稳定性的研究

本文研究主动横向稳定器降低车身侧倾向，以及与后轴转向系统协调控制时，提高商用车操纵稳定性的效果，实车试验表明，采用前轮转角前馈控制方法，汽车转向时稳定器产生反侧力矩，大幅度地降低车身侧倾；当与后轴转向系统协调控制时，能够提高商用车的操纵稳定性。     

客车轮胎建模和对侧倾稳定性的影响研究

客车轮胎与客车整车的侧倾稳定性有密切联系,ADAMS是典型的动力学虚拟样机仿真软件。介绍了在ADAMS中建立非线性轮胎的方法,在ADAMS中建立客车整车模型,通过改变整车模型中轮胎的刚度和阻尼,研究客车轮胎对整车侧倾稳定性的影响,从而为设计出符合性能要求的客车轮胎提供一定的理论依据。     

主动悬架系统对汽车侧翻稳定性改善分析

针对被动悬架系统侧翻稳定性比较差的问题,提出采用主动悬架系统的方法进行改善。通过汽车侧倾运动状态分析,建立了被动悬架系统、主动悬架系统和控制系统模型。模拟分析得到主动悬架系统使得汽车在弯道行驶时的侧倾角有效值下降了92.8%,侧倾角加速度有效值下降了78.2%,侧翻因子有效值下降了92.6%。结果表明:利用主动悬架系统可以有效地降低汽车非直线行驶时的侧倾角以及侧倾角加速度,提高汽车的侧翻稳定性,是提高汽车非直线行驶状态下安全性的一个合理的解决方案。     

Roll stabilisation of road vehicles using a variable stiffness suspension system

A variable stiffness architecture is used in the suspension system to counteract the body roll moment, thereby enhancing the roll stability of the vehicle. The variation of stiffness concept uses the ‘reciprocal actuation’ to effectively transfer energy between a vertical traditional strut and a horizontal oscillating control mass, thereby improving the energy dissipation of the overall suspension. The lateral dynamics of the system is developed using a bicycle model. The accompanying roll dynamics are also developed and validated using experimental data. The positions of the left and right control masses are sequentially allocated to reduce the effective body roll and roll rate. Simulation results show that the resulting variable stiffness suspension system has more than 50% improvement in roll response over the traditional constant stiffness counterparts. The simulation scenarios examined is the fishhook manoeuvre.     

Advanced Control Methods of Active Suspension

This paper describes new control methods for the active suspension. For improving ride comfort further, preview control rule is proposed. For improving stability further, roll stiffness distribution control rule is examined by the test vehicle. Simulations and vehicle driving tests are conducted to confirm the effect of these new control methods. The results of simulations and vehicle driving tests show in our research phase that preview control can achieve a substantial improvement in ride comfort and application of roll stiffness distribution control provides a large improvement in stability     

变截面悬架稳定杆刚度计算与分析研究

以汽车变截面悬架稳定杆为研究对象,基于卡氏定理推导了该类型悬架稳定杆扭转刚度计算公式,并与CAE仿真分析结果进行对比,结果表明两者吻合良好。基于文中推导的扭转刚度计算方法,以某型实际车辆稳定杆为例,分析并研究了空间安装角、过渡区圆角半径、中间部位杆径及长度对扭转刚度的影响规律。最后结合实际底盘调试工作,提出了一种可快速改变稳定杆扭转刚度的改制方案,降低了调试成本并提升了调试效率。     

Investigation into untripped rollover of light vehicles in the modified fishhook and the sine maneuvers. Part I: Vehicle modelling, roll and yaw instability

Vehicle rollovers may occur under steering-only maneuvers because of roll or yaw instability. In this paper, the modified fishhook and the sine maneuvers are used to investigate a vehicle's rollover resistance capability through simulation. A 9-degrees of freedom (DOF) vehicle model is first developed for the investigation. The vehicle model includes the roll, yaw, pitch, and bounce modes and passive independent suspensions. It is verified with the existing 3-DOF roll-yaw model. A rollover critical factor (RCF) quantifying a vehicle's rollover resistance capability is then constructed based on the static stability factor (SSF) and taking into account the influence of other key dynamic factors.

Simulation results show that the vehicle with certain parameters will rollover during the fishhook maneuver because of roll instability; however, the vehicle with increased suspension stiffness, which does not rollover during the fishhook maneuver, may exceed its rollover resistance limit because of yaw instability during the sine maneuver. Typically, rollover in the sine maneuver happens after several cycles.

It has been found that the proposed RCF well quantifies the rollover resistance capability of a vehicle for the two specified maneuvers. In general, the larger the RCF, the more kinetically stable is a vehicle. A vehicle becomes unstable when its RCF is less than zero. Detailed discussion on the effects of key vehicle system parameters and drive conditions on the RCF in the fishhook and the sine maneuver is presented in Part II of this study.     

基于多目标粒子群优化算法的某轻型商用车操纵稳定性优化研究

针对某轻型商用车稳态回转时侧倾度偏大的问题对其悬架进行优化改进。基于ADAMS/car搭建整车多体动力学模型,通过前悬架反向平行轮跳试验、后悬架理论计算验证了悬架仿真模型的准确性。进行整车稳态回转工况和转向盘中间位置转向工况仿真分析,结果表明,车身侧倾度偏高。为实现操纵稳定性优化分析的流程自动化,提出了基于modeFRONTIER的联合仿真方法。以悬架设计参数为优化变量,以汽车的侧倾度与横摆角速度响应滞后时间为优化目标,采用拉丁超立方试验设计方法拟合得到混合代理模型,并结合多目标粒子群优化算法对悬架系统进行多目标优化,获得了悬架系统优化方案。优化结果显示,在不影响平顺性的前提下,汽车车身侧倾度降低了13.93%,横摆角速度响应滞后时间降低了2.75%,整车操纵稳定性得到了提升。     

Advanced Control Methods of Active Suspension

SUMMARY

This paper describes new control methods for the active suspension. For improving ride comfort further, preview control rule is proposed. For improving stability further, roll stiffness distribution control rule is examined by the test vehicle. Simulations and vehicle driving tests are conducted to confirm the effect of these new control methods. The results of simulations and vehicle driving tests show in our research phase that preview control can achieve a substantial improvement in ride comfort and application of roll stiffness distribution control provides a large improvement in stability