共查询到20条相似文献，搜索用时 625 毫秒
1.
2.
振动舒适性是车辆性能的重要方面,动力传动系统的振动对整车振噪舒适性具有重要影响。系统分析了动力传动系统的弯曲振动问题,从模型的搭建、试验研究、影响因素及控制方法四个方面进行分析,对研究车辆的振噪舒适性具有重要意义。 相似文献
3.
4.
汽车动力转向系统能使车辆转向轻便,转向盘冲击力减少,提高驾驶舒适性,而且在遇到一侧车轮爆破汽车突然偏向一侧时,动力转向系统能使汽车近似维持直线行驶,保证行车安全。所以动力转向系统深受广大驾驶员的欢迎。目前,动力转向系统除液压式外,在一些高档乘用车上使用了电控动和转向系统。动力转向系统一旦出现故障,驾驶车辆 相似文献
5.
前言汽车悬架系统一般由弹性元件(弹簧)、阻尼元件(减振器)、导向机构三部分组成,减振器作为阻尼元件是悬架的重要组成元件之一。汽车行驶必然会产生振动,减振器正式为迅速衰减振动而设计的。汽车减振器作为汽车的重要部件,对整车的平顺性、舒适性和动力性、安全性有很大的影 相似文献
6.
随着世界经济及汽车电控技术的发展,人们对汽车的安全性、驾驶的舒适性、节能环保性、以及操纵稳定性越来越重视。具备着节能环保及助力可调节等优点的汽车电动助力转向(EPS)系统,越来越受到人们的重视,而且装配简单、占用空间小,因此,EPS系统有很大的应用领域及市场发展空间。对于新能源汽车来说,必须选择EPS系统,因为它不需要使用内燃机,助力转向系统动力的来源只有来自电动机。 相似文献
7.
随着经济的快速发展,汽车已经成为了居民的消费品走入了百姓生活之中,改变了人们日常出行方式。由于现代工业的发展带动了汽车相关部件的研发,促进了汽车整体的安全性和舒适性的提高。但是实际研究中发现,汽车在行驶的过程中,经常出现传动系扭振的问题,此现象的发生导致了汽车整体噪音严重超标,而且随着汽车使用时间的越长造成的扭振现象越剧烈,汽车舒适性面临着严峻的挑战,同时该问题已经成为影响汽车工业发展的重要限制因素。 相似文献
8.
9.
随着汽车工业的迅速发展,人们对于汽车的舒适性和振动噪声控制的要求越来越严格。据国外有关资料表明,城市噪声的70％来源于交通噪声,而交通噪声主要是汽车噪声。它严重地污染着城市环境,影响着人们的生活、工作和健康。简述了噪声控制对于环境污染和乘坐舒适性的重要意义,分析了汽车产生噪声的各种原因,并提出了控制噪声的有效措施。 相似文献
10.
11.
随着市场需求的发展,用户对双前桥商用车的需求越来越大。文中介绍了双前轴转向汽丰的转向原理,以及以动力学仿真分析软件ADAMS为二次开发平台,建立针对重型双前桥商用车转向系统设计及优化的专用软件系统,对转向机构进行了优化设计。 相似文献
12.
汽车操纵稳定性是汽车的重要性能之一,然而多数关于汽车操纵稳定性的仿真都是基于汽车开路系统的仿真,如何将驾驶员的意识反馈到汽车的操纵特性上,形成人—汽车闭路系统的仿真还很少涉及。根据多体动力学理论基础,应用多体系统动力学仿真分析软件SIMPACK建立了汽车的整车模型,将驾驶员前方预描距离作为控制参数输入到转向操纵系统中,进而形成人—汽车闭路系统的仿真。最后将有预描距离和无预描距离作比较,得出驾驶员视野前方的预描距离对汽车的操纵稳定性起着很大的影响。 相似文献
13.
王兵 《科技成果管理与研究》2009,(7):90-91
车辆操纵稳定性对控制车辆不足转向和过多转向具有重要的意义,对车辆运动的稳态响应和稳定性都十分重要。轮胎侧偏刚度对车辆操纵稳定有着直接或间接的影响．具有不同特性的车辆将表现出与其相对应的瞬态操纵稳定特性。本文通过前后轮胎侧偏刚度对车辆的操纵稳定性进行简要的分析。 相似文献
14.
《Journal of The Franklin Institute》2018,355(18):9321-9350
This paper simultaneously addresses the parameter/state uncertainties, external disturbances, input saturations, and actuator faults in the handling and stability control for four-wheel independently actuated (FWIA) electric ground vehicles (EGVs). Considering the high cost of the available sensors for vehicle lateral velocity measurement, a robust H∞ dynamic output-feedback controller is designed to control the vehicle motion without using the lateral velocity information. The investigated parameter/state uncertainties include the tire cornering stiffness, vehicle mass, and vehicle longitudinal velocity. The unmodeled terms in the vehicle lateral dynamics model are dealt as the external disturbances. Faults of the active steering system and in-wheel motors can cause dangerous consequences for driving, and are considered in the control design. Input saturation issues for the tire forces can deteriorate the control effects, and are handled by the proposed strategy. Integrated control with active front steering (AFS) and direct yaw moment (DYC) is adopted to control the vehicle yaw rate and sideslip angle simultaneously. Simulation results based on a high-fidelity and full-car model via CarSim-Simulink show the effectiveness of the proposed control approach. 相似文献
15.
张勇 《科技成果管理与研究》2009,(4):71-73
论文结合笔者参与的电梯检验实践,分析了电梯运行时振动及噪声产生的原因,对电梯的振动及噪声问题提出了解决方法,有针对地采取了措施加以弥补和改进电梯的乘坐舒适性提供参考。 相似文献
16.
《Journal of The Franklin Institute》2023,360(11):7269-7293
The interferences and drivers' maloperations are important factors affecting vehicle driving safety. This paper investigates the problem of authority allocation to weaken the impact of interferences and drivers’ maloperations on the shared steering control system. Based on the parallel framework of the shared steering control system, an extended framework including the upper level and the lower lever is proposed. The lower lever is used to realize the shared steering control, which includes the driver model, trajectory tracking controller and vehicle model. To improve the robustness of the system, the uncertainty of vehicle dynamics parameters is considered in the trajectory tracking controller, including tire cornering stiffness and longitudinal velocity. The upper level is used to calculate the authority level of the driver and controller required by the lower lever, which consists of an authority dynamic allocation model and an authority allocation decision strategy. The role of the authority dynamic allocation model is to calculate the reference allocation level of the driver and controller dynamically. When the driver's operation and vehicle working states are trustworthy, the reference allocation levels of the driver and controller will be followed. Conversely, a decision result will be gained by the authority allocation decision strategy to replace the reference allocation levels, and the sum of the authority levels of the driver and the automation will not be fixed as 1. The simulation results show that the proposed approach can effectively improve vehicle driving safety, anti-interference and reliability, and can effectively reduce the impact of crosswind and driver's maloperation on vehicle safety, and alleviate the driver's operation load. 相似文献
17.
The steering torque of automobile EPS steering system is significant for driving steering control and good driving feel. Servo motor control and external interference moment are the core factors affecting EPS steering system. With the advancement of automotive technology, the requirements of EPS control technology have been gradually improved, and the driving and handling of vehicles at high speed have become the key issues. For the current EPS steering system at high speed vibration and steering feel, active disturbance rejection EPS torque control method is proposed, EPS variable mode controller was developed. The control of the variable mode is verified by experiment and the vibration torque from the road is controlled, determine the control frequency of 30 KHz, the amount of current fluctuation is the smallest. The ADRC (active disturbance rejection controller) technology is used to suppress the interference of the road surface, finally, the validity of active immunity is verified by bench test. Steering wheel vibration torque can be reduced by an average of 28.5% to 33.3%. 相似文献
18.
纵断面设计的任务就是根据汽车的动力特性,道路等级、当地的自然地理条件及工程经济性等研究起伏空间线等几何构成的大小及长度,以便达到行车安全迅速、运输经济合理及舒适的目的。根据某算例,对某公路进行纵断面设计。 相似文献
19.
《Journal of The Franklin Institute》2022,359(16):8713-8741
In this paper, the optimal driving torques of four wheels in an electric vehicle (EV) are obtained by minimizing the losses of four in-wheel motors. In order to slightly change these optimal torques for vehicle stability recovery, a new constrained active front steering (AFS) system is analytically designed and integrated with the torque vectoring (TV) system in a novel decentralized structure. In the proposed structure, the required external yaw moment is applied by the TV controller only when the constrained AFS is filled to capacity determined by a stability index extracted from the nonlinear phase plane analysis. As a result of this integration strategy, the external yaw moment is used as low as possible. Consequently, the torques in electrical motors are used near the optimal values consistent with optimal energy consumption. Comparative simulation studies with the standalone TV are conducted in the CarSim software environment to show the efficiency of the proposed decentralized control structure in terms of energy consumption and stability. Moreover, the suitability of the constrained control method used in the integration structure is shown in comparison with the well-known nonlinear model predictive control method in terms of practical implementation. 相似文献
20.
为准确掌握输电线路的振动状态,预测导线疲劳程度,本文通过Miner累计损伤理论及W魻hler安全边界曲线分析了输电线路疲劳寿命的估计方法,设计了一种基于传感器技术,数据采集技术、无线通信技术等的输电线路微风振动监测系统,该系统主要由振动监测模块、监测基站及监测中心组成,将该监测系统安装于某段输电线路,实际运行结果表明,该系统性能良好。 相似文献