基于半车动力学模型的汽车被动悬架特性研究

基于系统动力学理论建立了含被动悬架的汽车半车动力学模型。在MATLAB／Simulink中,集成以白噪声一积分器产生的地面输入,及前、后悬架非簧栽质量模型和车体运动模型,最终实现被动悬架特性仿真的软件编程,为悬架参数的设计和优化提供了技术基础。     

基于ADAMS悬架特性对汽车道路友好性的影响

利用ADAMS动力仿真软件在ADAMS/view模块下建立了整车模型,建立了被动悬架和主动悬架模型并编制路面谱文件,对整车模型进行动力仿真对比分析被动悬架和主动悬架的悬架特性对道路友好性的影响并得出结论。     

基于虚拟样机技术的汽车悬架动力学仿真分析

应用机械系统动力学仿真分析软件ADAMS/view建立某车麦弗逊式前悬架多体系统模型,通过仿真分析,校核了相关部件是否有运动干涉,分析了前轮定位参数的变化特性,并确定悬架的刚度,仿真结果可为悬架的开发和参数优化提供理论依据.     

基于分数阶模型的电动汽车悬架灵敏度分析与参数优化

为了优化被动分数阶电动汽车悬架的参数,引入车身振动加速度、悬架动挠度、轮胎动载荷和电机垂直加速度这4个平顺性指标,建立含分数阶被动控制悬架系统的三自由度1/4电动汽车非线性模型.利用蒙特卡洛(Monte Carlo)算法对悬架参数的不确定性进行仿真及灵敏度分析,并选取灵敏度高的参数,采用改进的粒子群优化(particl...     

混合悬架双向馈能半主动系统设计与分析

针对主动悬架的高能耗问题,设计了一种混合电磁悬架双向馈能半主动控制系统.首先,建立了悬架的二自由度机-电耦合模型,设计了双向馈能电路,提出了天棚算法和滞环电流控制相结合的悬架半主动控制系统,并基于随机振动理论和阻尼耗散机理,推导了其动力学和能量性能指标.其次,分析了被动阻尼和负载电阻对悬架动力学性能和能量性能的影响规律...     

基于MATLAB的汽车主动悬架仿真研究

针对不同悬架的性能特点,分别建立了被动悬架、主动悬架的车身与车轮两自由度振动模型,基于Matlab软件用白噪声法模拟了路面不平度随机输入,在此基础上,对被动悬架与主动悬架的性能进行了仿真对比.仿真结果表明:主动悬架能更好地衰减振动,因此具有更佳的平顺性.     

基于改进萤火虫优化算法的汽车悬架PID控制

为了获得更好的汽车平顺性,构建1/4汽车主动悬架模型,采用悬架动挠度、车身动位移、轮胎动载荷和轮胎垂直速度等4项指标进行近似衡量,提出基于改进萤火虫优化算法（FA）的汽车悬架PID控制,并与基于LQR控制、基于Fuzzy-PID控制下的汽车悬架平顺性进行对比。仿真结果显示,基于改进FA优化的PID控制的4项指标峰值均大幅降低,峰值最高下降36.1%,证明基于改进萤火虫优化算法的PID控制可提高汽车平顺性能。     

基于遗传算法的汽车主动悬架最优PID控制与仿真

本文以车辆主动悬架系统为研究对象,建立了1/4车辆模型,在此基础上建立simulink模型,并设计了PID控制器,然后运用遗传算法对相关参数进行了优化设计,实现了主动悬架的最优PID控制.最后对比了主、被动悬架的性能指标(车身加速度、悬架动挠度、车轮动位移),结果表明通过本文方法实现的最优PID控制器对于改善车辆的行驶平顺性和稳定性是有效的.     

基于ADAMS的汽车悬架系统仿真分析与优化

采用某A级车的前悬架参数,建立完整的悬架模型,并对该悬架系统进行仿真与优化。详细说明悬架系统建立和仿真的方法,并具体分析了悬架参数改变对汽车操纵稳定性的影响。优化分析结果表明,通过进一步进行悬架优化设计,汽车的操纵稳定性得到提高。     

基于多体模型的汽车主动悬架控制分析

在多体动力学的基础上,建立了控制对象的动力学模型,推导出多体动力学方程,采用模糊控制算法,得到仿真结果,表明提出的方法能明显改进主动悬架的性能。     

Adaptive Controller for Vehicle Active Suspension Generated Through LMS Filter Algorithms

The least means squares (LMS) adaptive filter algorithm was used in active suspension system. By adjusting the weight of adaptive filter, the minimum quadratic performance index was obtained. For two-degree-of-freedom vehicle suspension model, LMS adaptive controller was designed. The acceleration of the sprung mass,the dynamic tyre load between wheels and road,and the dynamic deflection between sprung mass and unsprung mass were determined as the evaluation targets of suspension performance. For LMS adaptive control suspension, compared with passive suspension, acceleration power spectral density of sprung mass acceleration under the road input model decreased 8-10 times in high frequency resonance band or low frequency resonance band. The simulation results show that LMS adaptive control is simple and remarkably effective. It further proves that the active control suspension system can improve both the riding comfort and handling safety in various operation conditions, and the method is fit for the active control of the suspension system.     

Control method for semi-active suspension based on virtual prototype

1 Introduction 1 Semi-active suspension is advantaged by good performance and low price over the passive suspension and active suspension [1]. The control strategy as the core of a control system is widely researched in practice. The simple dynamic model is often adopted in the typical process. However, the differences between the practical and physical models bring on more idealization and less practicability. On the other hand, the mechanical designer and the controls designer use different…     

基于Simulink与模糊算法的车辆半主动悬架控制系统研究

为改善汽车的平顺性,将模糊控制算法引入半主动悬架,对其控制系统进行研究。首先以四自由度汽车半主动悬架为研究对象建立了其数学模型与仿真模型;在Matlab中利用模糊逻辑工具箱Fuzzy Toolbox设计了半主动悬架模糊控制器;在此基础上,利用Matlab/Simulink软件搭建半主动悬架模糊控制系统并在白噪声路面及阶跃路面信号激励下进行仿真试验。实验结果表明,所设计的模糊控制器可以有效改善汽车的平顺性并提高汽车的行驶安全性。     

Computer simulation of active suspension based on the full-vehicle model

The current method to solve the problem of active suspension control for a vehicle is often dealt with a quarter-car or half-car model.But it is not enough to use this kind of model for practical applications.In this paper,based on considering the influence of factors such as,seat and passengers a MDOF(multi-degree-of-freedom)model describing the vehicle motion is set up.The MODF model,which is 8DOF of four independent suspensions and four wheel tracks,is more applicable by comparison of its analysis result with some conventional vehicle models.Therefore,it is more suitable to use the 8DOF full-car model than a conventional 4DOF half-car model in the active control design for car vibration.Based on the derived 8DOF odel,a controller is designed by using LQ(linear quadratic)control theory,and the appropriate control scheme is selected by testing various performance indexes.Computer simulation 8is carried out for a passenger car running on a road with step disturbance and random road disturbance expressed by Power Spectral Density(PSD).Vibrations corresponding to ride comfort are derived under the foregoing road disturbances.The response results for uncontrolled and controlled system are compared.The response of vehicle vibration is greatly suppressed and quickly damped.which testifies the effect of the active suspenson.The results achieved for various controllers are compared to invesigate the influence of different control schemes on the control effect.     

Proportional-integral-derivative control of nonlinear half-car electro-hydraulic suspension systems

This paper presents the development of a proportional-integral-derivative (PID)-based control method for application to active vehicle suspension systems (AVSS). This method uses an inner PID hydraulic actuator force control loop, in combination with an outer PID suspension travel control loop, to control a nonlinear half-car AVSS. Robustness to model uncertainty in the form of variation in suspension damping is tested, comparing performance of the AVSS with a passive vehicle suspension system (PVSS), with similar model parameters. Spectral analysis of suspension system model output data, obtained by performing a road input disturbance frequency sweep, provides frequency response plots for both nonlinear vehicle suspension systems and time domain vehicle responses to a sinusoidal road input disturbance on a smooth road. The results show the greater robustness of the AVSS over the PVSS to parametric uncertainty in the frequency and time domains.     

由MR阻尼器驱动的汽车悬架减振系统的半主动控制研究

设计了一种半主动力跟踪PI控制器，对由磁流液(MR)阻尼器作为悬架阻尼器的汽车模型进行控制分析．MR阻尼器的2种不同模型在闭环的汽车悬架控制系统模型中得到了应用．2种模型是基于均值阻尼力对速度(f-v)特性的均值F-v模型，和描述阻尼力非光滑滞环和饱和特性的滞环f-v模型．汽车模型用来研究力跟踪PI控制算法和MR阻尼器对车辆的振动抑制性能．仿真分析还指出了MR阻尼器的非线性，特别是滞环特性对汽车悬架系统的性能影响．结果表明所提出的控制方法对由MR阻尼器驱动的汽车悬架系统能产生很好的减振效果，不仅体现在对悬架弹簧支撑车厢的共振抑制和对驾乘人员舒适性敏感频域的振动抑制，还体现在对汽车轮胎共振频率周围的振动抑制．结果还进一步说明了MR阻尼器所存在的滞环特性对汽车悬架性能的不良影响．     

基于 ADAMS 的仿人机器人行走仿真

采用机械系统动力学仿真分析软件 ADAMS 进行建模和动力学仿真,提供机器人三维实体模型、运动学和动力学模型以及动画仿真.采用控制系统专业软件 Matlab 进行机器人控制系统设计,提供控制关节目标轨迹、稳定控制算法并输出驱动力矩.通过 ADAMS/Controls 接口模块建立起 Matlab 与 ADAMS 之间的数据接口.联合仿真方法为实现仿人机器人在线控制奠定了基础