地铁车辆车轮踏面异常磨耗原因初探

运营速度80 km/h常规城轨车辆的基础制动方式基本采用踏面制动+合成闸瓦,文章针对城轨车辆合成闸瓦对车轮踏面磨耗的影响、制动力分配方式对踏面磨耗的影响、闸瓦与车轮的匹配及热负荷计算等进行了分析研究,探讨了造成地铁车辆踏面异常磨耗的原因。     

基于逆变回馈的地铁再生制动能量吸收的研究

城市轨道交通车辆再生制动能量吸收是城市轨道交通系统的重要组成部分.分析了逆变回馈型再生制动能量吸收装置的构成、工作原理.建立了该装置的主电路及控制电路仿真模型,并对列车再生制动回馈的动态全过程进行了模拟试验.试验结果表明:该装置满足地铁列车再生制动能量的吸收利用以及稳定牵引网电压的要求,可解决实际工程问题.     

再生制动能量吸收装置设置方案研究

分析了国内外目前所应用的列车再生制动能量吸收装置方案的优缺点,提出了城市轨道交通设置列车再生制动能量吸收装置的建议方案。     

高速动车组制动夹钳单元运行振动分析

制动夹钳单元是制动系统的重要组成部分。制动夹钳单元的性能影响到高速动车组行车安全。本文通过对在武广、京沪高铁上进行的夹钳振动试验数据的分析,对夹钳单元各主要部件的振动形式进行研究。研究明确了夹钳单元各主要部分的振动特性,并着重针对卡簧在运行中的振动情况进行仿真分析和试验结果比对。通过本文研究,对夹钳单元的振动特性有了更深入的了解,为夹钳单元的设计、改进提供了依据,以更好地保障动车组制动系统安全、可靠。     

高速动车组备用制动系统仿真分析研究

基于现代流体力学数值仿真技术,以高速动车组备用制动系统作为研究对象,建立了备用制动系统中分配阀等关键部件的仿真模型,研究了沿列车管长度方向的减压制动,再现备用制动实施的过程。研究工作为列车备用制动系统的设计、试验研究提供理论参考。     

俄罗斯制动技术的新发展

介绍俄罗斯铁路采用的制动系统新技术,该技术可提高制动装置的效率和列车的运行安全性。     

制动系统的技术课题与发展动向

介绍了日本制动系统的技术发展现状、主要成果,以及待解决的课题,展望了将来的技术动向,也对合成闸瓦及新一代制动技术的开发动向进行了阐述。     

A theoretical model of speed-dependent steering torque for rolling tyres

ABSTRACT

It is well known that the tyre steering torque is highly dependent on the tyre rolling speed. In limited cases, i.e. parking manoeuvre, the steering torque approaches the maximum. With the increasing tyre speed, the steering torque decreased rapidly. Accurate modelling of the speed-dependent behaviour for the tyre steering torque is a key factor to calibrate the electric power steering (EPS) system and tune the handling performance of vehicles. However, no satisfactory theoretical model can be found in the existing literature to explain this phenomenon. This paper proposes a new theoretical framework to model this important tyre behaviour, which includes three key factors: (1) tyre three-dimensional transient rolling kinematics with turn-slip; (2) dynamical force and moment generation; and (3) the mixed Lagrange–Euler method for contact deformation solving. A nonlinear finite-element code has been developed to implement the proposed approach. It can be found that the main mechanism for the speed-dependent steering torque is due to turn-slip-related kinematics. This paper provides a theory to explain the complex mechanism of the tyre steering torque generation, which helps to understand the speed-dependent tyre steering torque, tyre road feeling and EPS calibration.     

Practicability study on the suitability of artificial,neural networks for the approximation of unknown steering torques

For steer-by-wire systems, the steering feedback must be generated artificially due to the system characteristics. Classical control concepts require operating-point driven optimisations as well as increased calibration efforts in order to adequately simulate the steering torque in all driving states. Artificial neural networks (ANNs) are an innovative control concept; they are capable of learning arbitrary non-linear correlations without complex knowledge of physical dependencies. The present study investigates the suitability of neural networks for approximating unknown steering torques. To ensure robust processing of arbitrary data, network training with a sufficient volume of training data is required, that represents the relation between the input and target values in a wide range. The data were recorded in the course of various test drives. In this research, a variety of network topologies were trained, analysed and evaluated. Though the fundamental suitability of ANNs for the present control task was demonstrated.     

浅析电动汽车中的再生制动

电动汽车可以实现再生制动。本文对变频器再生制动的原理、应用进行详细的阐述,并通过仿真加以证明。