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．     

基于遗传算法的重型越野车悬架系统优化设计

汽车悬架系统的优化设计是提供良好的操纵稳定性和行驶平顺性最有效方法之一。为提高某重型越野汽车悬架系统稳定性和可控性,利用ADAMS软件对此越野汽车悬架系统进行了虚拟样机建模,采用遗传算法对悬架系统的几何参数进行优化。通过悬架系统模型的仿真结果,能够发现由于道路平整度和转向角不同而引起的几何参数的变化规律,并比较了不同工况下优化后悬架系统和传统悬架系统的参数变化结果。优化结果表明,优化后的悬架系统降低了外倾角的变化,改善了操纵性和平顺性。     

基于神经网络的汽车半主动悬架控制器的设计

以汽车半主动悬架为研究对象,建立了汽车二自由度1／4车体模型,提出了一种汽车半主动悬架的神经网络控制方法,设计了神经网络控制器,并利用MATLAB进行仿真。仿真结果表明,该神经网络控制器用于半主动悬架的车身加速度和车身重心高度位移控制是行之有效的。     

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。     

汽车主动悬架及电动转向系统模拟实验装置的研究与开发

主动悬架系统和电动转向系统分属于现代汽车不同的底盘系统,但它们之间相互作用、相互影响.文章以LS430主动悬架系统和电动助力转向系统为研究对象,在应用原车配件的基础上设计开发了主动悬架及电动转向系统模拟实验装置,通过本系统不仅能够清楚地了解主动悬架及电动助力转向系统的结构组成,提取不同的传感器数据波形、动态数据流等,而且能够再现原车主动悬架和电动转向系统的控制策略和控制过程,同时利用该模拟实验装置,能够方便学校教学和企业培训.     

半车模型汽车主动悬架系统控制器的设计与仿真研究

基于系统动力学理论建模半车模型主动悬架系统的动力学模型,采用分隔研究法,分别对1／4的垂直运动和1／2车体的俯仰运动进行独立控制,并叠加在一起来研究半车模型的整体控制;其次在MATLAB／Simulink中建立其相应的控制器模型和仿真模型。最后采用积分白噪声模型作为路面输入形式。然后结合半车模型主动悬架的系统仿真模型进行该系统动态特性仿真,并将主、被动悬架特性进行对比分析。仿真结果表明,相对于被动悬架主动悬架性能有明显改善。     

汽车LE-ABS系统的分析与设计

汽车的轮速传感器不足以反映汽车的ABS系统的性能，必须利用滑移率来控制汽车的制动系统．才能达到最佳的制动效果。在日本三菱PAJERO—im型越野汽车的电子控制ABS电路的基础上．设计了一种光电控制的汽车的ABS系统，该系统是利用滑移率来控制汽车ABS系统。     

基于模糊神经PID控制的汽车主动悬架平顺性分析与测试

路面的激励作用会使车辆在行驶过程中产生颠簸和振动,严重影响汽车行驶平顺性和乘坐舒适性。建立了1/4汽车主动悬架数学模型,提出一种基于模糊神经网络的控制策略。该方法利用了模糊控制鲁棒性强和神经网络控制收敛速度快的特点,对系统参数进行实时在线调整;同时,以悬架动行程、车轮动载荷以及车身垂直加速度为衡量指标进行仿真分析和测试研究。结果表明,所提出的控制策略可以有效减小汽车在行驶中因路面激励作用而产生的振动,大幅改善了车辆操纵稳定性、汽车行驶平顺性及乘坐舒适性,鲁棒性强,有一定可借鉴意义。     

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。     

半挂汽车列车稳态转向特性判别方法研究

为了分析半挂汽车的稳态转向特性，研究了3种用于判别半挂汽车列车稳态转向特性的方法：线性系统稳态转向特性的判别、非线性系统稳态转向特性的计算机仿真分析、能量相平面法。通过对3种分析方法进行比较可知，3种方法相互补充，可以更全面地判别半挂汽车列车稳态转向特性。     

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.     

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.     

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.     

频段内汽车悬架时滞反馈控制参数优化

对有限频段内汽车悬架系统的时滞反馈控制参数优化问题进行研究。首先,建立时滞加速度反馈控制下 1/4 汽车悬架系统力学模型,推导出车身和车轮加速度幅值的解析表达式;其次,通过对系统稳定性分析,得到关于反馈增益系数和时滞的稳定性分区图,以数值计算验证稳定性分析的正确性;最后,在有限频段内以最大车身加速度变化的百分比为优化目标,以反馈增益系数和时滞为优化参数,利用粒子群优化算法获得有限频段内最优反馈增益系数和时滞。实验结果表明,与被动汽车悬架系统相比较,最优时滞反馈控制下汽车悬架系统的隔振性能获得了明显提高,在最优时滞反馈控制参数取值下,有限频段内车身加速度幅值至少降低37.27%。     

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。     

空气弹簧悬架的振动模型参数特性研究

目前空气弹簧已广泛应用于车辆悬架系统中。车辆动力学性能主要取决于悬架参教的匹配。悬架参教的精确性将直接影响车辆行驶的平稳性。基于热力学理论和气体状态方程式，建立了带附加气室的空气弹簧的统一力学模型，对其数学模型进行了求解，得出了其瞬态响应和稳态响应的理论值，求出了空气弹簧的自振频率和粘滞阻尼系数。为设计制造空气弹簧奠定了一定的理论基础。     

A tunable fuzzy logic controller for the vehicle semi-active suspension system

On the basis of analyzing the system constitution of vehicle semi-active suspension,a 4-DOF(degree of freedom)dynamic model is established.A tunable fuzzy logic controller is designed by using without quantification method and taking into account the uncertainty,nonlinearity and complexity of parameters for a vehicle suspension system.Simulation to test the performance of this controller is performed under random excitations and definite disturbances of a C grade road,and the effects of time delay and changes of system parameters on the vehicle suspension system are researched.The numerical simulation shows that the performance of the designed tunable fuzzy logic controller is effective,stable and reliable.