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车辆的动力学模型是进行动力学仿真的基础.该文研究了车辆动力学模型,分析了车辆的地面受力,得出了车辆的整车运动微分方程及簧上质量运动微分方程.用Matlab/Simulink实现了车辆的动力学仿真模型,该模型包括了整车模型及车辆行走系统模型,行走系统主要由车轮模型组成,用来仿真车轮所受到的地面作用力及对车轮的操纵与控制力.使用所建模型进行了车辆动力学仿真,车辆的运动仿真状态变化情况及受力变化情况与实际情况基本吻合. 相似文献
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分析了双离合器式自动变速器车辆的频繁换挡及意外换挡现象,指出了引起DCT车辆频繁换挡的直接原因是车速相对于油门突变的滞后,根本原因是基于稳态工况的传统换挡规律无法满足动态工况下的要求。采用基于结构风险最小化准则的支持向量机方法建立了发动机动态转矩和油耗模型,提出了基于油门、车速、油门变化率为输入的三参数换挡规律设计方法,当油门突变时,系统能够根据油门变化率实时修正换挡规律,油门突增则降挡规律减小,油门突减则升挡规律增加,从而避免发生频繁换挡及意外换挡。运用Matlab/Simulink进行了DCT车辆的换挡仿真研究,并通过了自动变速器台架实验验证。仿真和实验结果表明基于支持向量机发动机动态模型的换挡规律在保留原有换挡规律优点的基础上,可以避免频繁换挡及意外换挡现象,满足车辆实际行驶工况的需要,具有更好的动力性和燃油经济性。 相似文献
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高速车轮椭圆化对车辆系统行为的影响 总被引:1,自引:0,他引:1
建立考虑车轮椭圆化状态下的整车车辆/轨道空间耦合动力学模型,基于此模型,发展相应的数值方法,分析计算高速运行状态下车轮椭圆化程度对车辆系统动态行为的影响,给出车速200~350 km/h时车体横移、轮对横移、轮轨垂向力和轮重减载率等关键指标,确定高速行车条件下车轮圆度的临界范围.数值结果分析表明,在车轮椭圆化的情况下,车辆系统动力学响应关键指标与行车速度、车轮的圆度以及轮对左右车轮椭圆形状的相位有密切联系.高速车轮椭圆化将导致车辆系统动力学性能的显著变化,随着车轮圆度的增大,车辆系统运行品质严重恶化,其横向稳定性和轮重减载率大大降低,从而减小车辆/轨道系统各部件使用寿命、增大脱轨风险. 相似文献
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《机械工程与自动化》2016,(5)
为研究高速列车高阶车轮多边形对车辆系统动力学性能的影响,对轮对进行模态缩减,建立完整的车辆系统刚柔耦合动力学模型,模型中仅把轮对考虑为弹性体,其余部件视为刚体。通过修改轮对的外形来模拟车轮多边形,进行仿真计算研究车轮多边形波深、谐波数以及列车运行速度对车辆动力学性能的影响。结果表明:将轮对考虑为弹性体将会更加准确地模拟出车轮多边形化对轮轨力的影响,车轮多边形对车辆临界速度和轮轨垂向力有较大的影响,而且当多边形阶数达到一定值时车辆会出现跳轨现象;车轮多边形对车辆平稳性指标影响很小。 相似文献
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汽车ABS系统的PID控制策略及仿真分析 总被引:1,自引:0,他引:1
运用汽车动力学理论,建立了PID控制器模型、制动时整车动力学模型、车轮模型。提出了以滑移率为控制目标的ABS系统的控制仿真分析,将PID控制器应用于单个ABS系统控制研究,以车轮滑移率为控制目标,通过轮速与车速传感器采集汽车速度、车轮转速,计算出汽车各轮胎实际滑移率,与期望滑移率进行比较后,将二者的偏差作为PID控制器的输入量,反复调节控制器的控制参数,使其实际滑移率始终处于最佳滑移率附近,通过PID控制最终使汽车在最佳滑移率所对应的地面制动力下进行制动。 相似文献
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试验台依据行业国家标准而开发设计,是以机械惯量来模拟风电实际惯量的制动器试验台.为保证试验条件和实际工况的一致性,试验台采用直流电机作为有效风能和负载转速的模拟,采用旋转的惯性飞轮模拟风电机组实际工况中的载荷,利用设计的气压和液压系统模拟风电实际的制动力驱动装置,对风电制动器施加制动力矩.通过对风电制动器各性能参数的检... 相似文献
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Juyong Kang Wongun Kim Jongseok Lee Kyongsu Yi 《Journal of Mechanical Science and Technology》2010,24(3):793-800
This paper describes an autonomous driving control algorithm based on skid steering for a Robotic Vehicle with Articulated
Suspension (RVAS). The driving control algorithm consisted of four parts: speed controller for following the desired speed,
trajectory tracking controller to track the desired trajectory, longitudinal tire force distribution algorithm which determines
the optimal desired longitudinal tire force and wheel torque controller which determines the wheel torque command at each
wheel to keep the slip ratio below the limit value as well as to track the desired tire force. The longitudinal and vertical
tire force estimators were designed for optimal tire force distribution and wheel slip control. The dynamic model of the RVAS
is validated using vehicle test data. Simulation and vehicle tests were conducted in order to evaluate the proposed driving
control algorithm. Based on the simulation and test results, the proposed driving controller was shown to produces satisfactory
trajectory tracking performance. 相似文献
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In this paper, sensitivity analysis of side slip angle for a front wheel steering vehicle is performed in the frequency domain. For the derivation of the transfer function, a simple vehicle model with two degrees of freedom is used in the initial modeling stage. This model exhibits the simplest lateral dynamic effect, and is useful for understanding the dynamic characteristics and control aspects of the target system. Vehicle mass, inertia, cornering stiffness, and wheel base are taken to be the design variables. Sensitivity functions of the transfer function with respect to the design variables are derived. From this study, we see that a transition speed exists in the frequency response of side slip angle. This implies that the characteristics are changed from minimum phase to non-minimum phase as the vehicle speed increases. The objective of this study is to propose a basis for design and re-design of the vehicle by checking the side slip angle variations with respect to design variable changes in the frequency domain. Finally, dominant design variables are suggested based on the sensitivity analysis. 相似文献
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Jong Hyeon Park Dong Hee Kim Yong Ju Kim 《Journal of Mechanical Science and Technology》2001,15(10):1398-1407
In this paper, an anti-lock brake system (ABS) for commercial buses is proposed based on a fuzzy-logic controller and a sliding-mode observer of the vehicle speed. The brake controller generates pulse width modulated (PWM) control inputs to the solenoid valve of each brake, as a function of the estimated wheel slip ratio. PWM control inputs at the brakes significantly reduce chattering in the brake system compared with conventional on-off control inputs. The sliding-mode observer estimates the vehicle speed with measurements of wheel speed, which is then used to compute the wheel slip ratio. The effectiveness of the proposed control algorithm is validated by a series of computer simulations of bus driving, where the 14-DOF bus model is used. 相似文献
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对驾驶员理想转向盘力矩的影响因素进行分析,提出了一种用以描述稳态转向工况的驾驶员理想转向盘力矩模型。针对三款不同型号车辆进行驾驶员转向盘力矩道路试验, 建立了中国西南地区驾驶员理想转向盘力矩模型,研究结果表明: 一定车速下,驾驶员理想转向盘力矩是转向盘转角或者侧向加速度的增函数,但随着转向盘转角或者侧向加速度的增大,驾驶员理想转向盘力矩增大的程度减缓;一定转向盘转角或者侧向加速度下,驾驶员的理想转向盘力矩与速度近似成线性正比关系;如果车辆的体积、车重相近,道路条件相同,驾驶员理想转向盘力矩与车辆的型号无关。 相似文献