基于ADAMS/CAR二次开发模块研究汽车平顺性

以ADAMS／CAR二次开发模块为平台，建立了国产某小型客车虚拟样机的多体系统动力学仿真模型。按照国家有关整车平顺性的试验评价方法和标准，进行了整车平顺性脉冲输入和随机输入行驶仿真试验分析。对比实车测试结果，主要评价指标加权振级的最大仿真误差小于5％，即仿真结果具有较高的可信度，说明在车辆设计阶段，利用此二次开发模块可对其平顺性进行有效的分析和评估。     

汽车平顺性时域仿真分析

采用虚拟试验场技术进行了汽车行驶平顺性的时域仿真。建立了面向汽车平顺性分析的整车刚弹耦合有限元模型,同时建立了脉冲输入路面模型和随机输入路面模型。采用1/3倍频带分布加速度均方根值方法及总加权方法对试验车辆的平顺性进行了评价。试验结果表明,运用虚拟试验场技术能够真实地反映汽车的行驶平顺性,仿真分析结果可靠。     

基于ADAMS的汽车平顺性的仿真分析

基于山西某汽车公司的S108项目在ADAMS/Car模块中建立整车动力学仿真模型及路面模型,并进行整车的随机路面输入和脉冲输入平顺性仿真.通过仿真分析结果可知该车平顺性能良好.进一步改变前后悬架的弹簧刚度及减震器的阻尼,讨论其变化对该车的平顺性能的影响.仿真分析后,发现前悬架弹簧刚度的影响相对于后悬架稍大,而减震器阻尼的影响相对于后悬架稍小.     

面向平顺性的某SUV车型扭转梁式后悬架衬套刚度优化

针对某SUV车型,在ADAMS/Car软件中建立整车仿真模型,基于等效动力学方法,在模拟粗糙水泥砼路面的随机路面谱工况下进行平顺性仿真,对底盘质心处的垂直方向加速度进行分析。针对该种工况,通过ADAMS/Insight模块对整车模型扭转梁式后悬架的衬套刚度参数进行平顺性优化仿真,生成了平顺性优化方案,再使用该优化方案在其他工况下进行平顺性仿真分析,验证其对于多种不同工况的适应性,结果显示该平顺性优化方案在试验所考虑的几种工况下均具有可行性。     

双轴转向8×4货车多体动力学仿真分析及系统开发

以多体系统动力学理论为基础,建立了双轴转向8×4货车的多体系统动力学模型,建模过程中考虑了弹簧、阻尼器以及橡胶衬套的非线性特性,并以ADAMS软件为二次开发平台,建立了整车非线性多体动力学仿真分析系统,实现了以下功能:对双轴转向8×4货车整车模型的参数化自动建模功能;按照国标试验工况的自动仿真分析功能;符合汽车评价标准的仿真结果数据后处理功能。最后通过实车试验验证了模型的正确性,在此基础上进行了整车的随机输入平顺性分析。     

基于虚拟样机技术的扭杆悬架汽车平顺性仿真

运用面向整车系统的数字化虚拟样机技术和大型机械系统动力学仿真软件ADAMS建立了包括前后悬架、轮胎、转向系统及整车的多体动力学模型。用Visual Basic编制路面生成文件，生成不同等级的随机路面。对整车进行了随机输入平顺性仿真分析，把仿真数据输入编制的平顺性仿真程序中，发现结果满足国家规定的汽车平顺性评价标准。     

基于虚拟样机技术的载重卡车平顺性分析

利用参数化建模方法,在MSC.ADAMS/View软件中建立了某重型牵引车整车时域虚拟样机模型,并在B级路面上进行仿真分析,其结果可用于汽车工程设计阶段对其平顺性进行预测和控制.     

EQ6850客车平顺性仿真及试验分析

针对EQ6850空气悬架客车,利用整车Pro/E模型获取相关参数,导入ADAMS多体动力学分析软件,建立整车多体动力学仿真模型,对整车在B级路面上行驶的平顺性进行仿真分析和试验对比,验证平顺性仿真分析的有效性。     

某越野车平顺性试验的仿真

借助于软件ADAMS/Car,建立了某越野车整车多体动力学模型,然后根据国标规定,按照ADAMS路面文件的要求,建立平顺性脉冲路面,进行不同车速下的仿真试验,得到试验数据。对于随机输入试验,通过深入研究ADAMS／ Car下随机路面文件的特点,规定相应的参数,进行平顺性仿真。另外还探索利用谐波叠加法建立应用更为广泛的随机路面的方法。最后通过编制相应程序,对汽车的平顺性输出结果做出评价。     

汽车平顺性建模与仿真分析

运用面向整车系统的数字化虚拟样机技术，利用大型机械系统动力学仿真分析软件SIMPACK建立了前悬架、后悬架、轮胎及整车的多体系统模型。进行了整车的脉冲输人平顺性及随机输人平顺性仿真分析，分析结果与实车试验结果基本符合，实现了在汽车的设计阶段对其平顺性进行预测及分析的目的。     

基于虚拟样机技术的空气悬架客车平顺性仿真研究

针对某中型客车，利用ADAMS软件建立了空气悬架客车动力学仿真模型，并进行了随机路面输入及三角凸台路面输入的平顺性仿真分析。仿真结果与试验数据对比表明，在测量点处的最大加速度、自功率谱密度及其对应的频率点比较接近，说明所建立的仿真模型是准确的。对影响客车平顺性的2个参数在ADAMS中进行了优化。     

空气弹簧对重卡平顺性影响研究

为使重卡在平顺性方面满足国际或国家法规要求,利用专用软件,在建立有限元模型的基础上,通过计算机线性静态模拟计算分析,建立重卡有限元模型,进行动态模拟分析和数据分析,从重卡的平顺性出发,通过对安装空气弹簧重卡平顺性实验,然后建立重型卡车ADMAS/Car虚拟样机模型,针对空气弹簧在重卡上的平顺性能影响进行仿真和试验对比分析,并提出改进建议以达到设计目标。     

基于正交试验的虚拟样车平顺性分析及参数选择

利用多体力学理论,在机械系统动力学分析软件ADAMS中建立了某车的整车多体力学模型。将虚拟样车在三维空间道路上进行平顺性仿真试验,通过正交试验方法研究了前、后悬架弹簧刚度及相关主要衬套等性能参数对汽车行驶平顺性的影响,并根据正交试验的结果优选了相应的设计参数。     

基于虚拟路面的整车路噪轮胎参数相关性研究

为了在设计阶段保证整车的NVH性能,通过搭建虚拟路面仿真平台探究轮胎关键物理参数对于整车路面振动噪声的影响规律。结合实车采集的试验场NVH路面PSD、高精度物理轮胎CDTire模型以及整车声固耦合模型,建立完整的整车路噪仿真环境。通过某款SUV的仿真结果表明,不同款轮胎及同款轮胎不同批次对整车路面振动噪声有直接的影响。虚拟路面方法可以在整车开发早期甄别出在车辆噪声中起主导作用的频率段,从而排查明显的NVH设计缺陷,同时,可以为车型NVH正向开发提供轮胎选型依据。     

A Pitch-Plane Model of a Vehicle with Controlled Suspension

A vehicle model incorporating front and rear wheel suspensions and seat suspension is presented. The suspension control includes algorithms to provide both dynamic and steady state (levelling) control. Vehicle response to (a) vertical inputs due to ground disturbances at the wheels and (b) longitudinal inputs due to the inertial forces during braking and accelerating, are investigated. It is shown that the static (self-levelling) control causes a slight deterioration in dynamic performance. The active ride control produces improvements of ride comfort under dynamic conditions compared to an equivalent passively suspended vehicle. In steady state the proposed control eliminates the error heave of the body caused by tilting of the vehicle with active suspension.     

Ride Dynamics of High-Speed Tracked Vehicles: Simulation with Field Validation

SUMMARY

Ride dynamic behaviour of a typical high-speed tracked vehicle, such as a conventional military armoured personnel carrier (APC) negotiating rough off-road terrains, is studied through computer simulations and field tests. A comprehensive ride dynamic simulation model is developed, assuming constant forward vehicle speed and non-deformable terrain profile. The ride model includes dynamic track load and wheel/track-terrain interaction. Dynamic track load is modeled in view of track belt stretching and initial track tension, whereas an equivalent damper and continuous radial spring formulation is employed to model wheel/track-terrain interaction. Field testing of a APC subjected to discrete half round obstacles of various radii, a sinusoidal course, a random course, and a Belgian Pave\ is carried out for various vehicle configurations and speeds. Computer simulation results are validated against field measured results. The comparison of measured and predicted results shows generally good agreement.     

Development of an electric active rollcontrol (ARC) algorithm for a SUV

Cornering maneuvers with reduced body roll and without loss in comfort are leading requirements for car manufacturers. An electric active roll control (ARC) system controls body roll angle with motor-driven actuators installed in the centers of the front and rear stabilizer bars. A vehicle analysis model developed using a CarSim S/W was validated using vehicle test data. Two ARC algorithms for a sports utility vehicle (SUV) were designed using a sliding-mode control algorithm based on a nonlinear roll model and an estimated lateral acceleration based on a linearized roll model. Co-simulation with the Matlab simulink controller model and the CarSim vehicle model were conducted to evaluate the performance of two ARC control algorithms. To validate the ARC performance in a real vehicle, vehicle tests were conducted at KATECH proving ground using a small SUV equipped with two ARC actuators, upper and lower controllers and a few subsystems. From the simulation and vehicle validation test results, the proposed ARC control algorithm for the developed ARC actuator prototypes improves the vehicle’s dynamic performance.     

Conceptual design of high-speed semi-low-floor bogie for train-tram

Train-tram railway vehicles implement the connection between urban tramlines and the surrounding railway network. Train-tram railway vehicles, which use existing infrastructure, can help to avoid large investments in new railways or tramlines and make interchanges between city center and surrounding cities unnecessary. However, present train-tram rail vehicle cannot carry out the integration of operating by means of high speed in intercity railways with operating on small radius of curvature in inner city tramlines. This paper aims to develop a new model for solid wheelsets train-tram railway vehicles, which will not only pass the curve of 25mR radius of curvature traveling on inner city tramlines with the speed of 18 km/h, but also can travel on straight railway with 200 km/h high speed between intercity. In this paper, a new train-tram model, including five car-body and five motor bogies with ten traction motors, is addressed. Expect as a real rail vehicle testing, this study prefer virtual simulation, which is an effective way to show the rail vehicle performance, such as ride stability, ride comfort and ride safety, by means of evaluating the dynamic characteristics of rail vehicle. Moreover, Design of Experiment (DOE) method is used to optimize solid wheelsets bogie system on improving passenger comfort, safety and stability of train-tram. Parameters of components of bogie system are tuned to minimize the derailment coefficient and the ride comfort index. The results shows that the best comfort index for passenger and minimum derailment coefficient are found. The results also show that this optimized new train-tram model is reliable and practical enough to be applied on real rail vehicle design.