Dynamic performances of an innovative coupler used in heavy haul trains

An innovative structure for a heavy haul coupler with an arc surface contact and restoring bumpstop is proposed. This coupler has a small lateral force at a small yaw angle and a limitable yaw angle to ensure an allowable coupler lateral force under intense compressive force. The main structural characteristic of the combined contact coupler is a lateral movable follower with an appropriate friction coefficient of 0.06–0.08 and a slide block with a single freedom of longitudinal movement. In order to verify and simulate the performances, a multi-body dynamics model with four heavy haul locomotives and three detailed couplers was established to simulate the process of emergency braking. In addition, the coupler yaw instability and wheel set lateral forces were tested in order to investigate the effect of relevant parameters on the coupler performances. The combined contact coupler is suitable for heavy haul train for a good dynamic performance.     

Pneumatic train brake simulation method

The design of new pneumatic brakes for rail vehicles or improvements of existing ones can be made better or more efficient by the use of a simulation method. This paper gives a general presentation of the author’s modelling methods used for solving problems relating to railway pneumatic brakes. The brake models in this paper (slightly different from those of other authors) take into account air-wave phenomena including air viscosity, the influence of the brake pipe branches, heat transfer in the brake pipes and reservoirs, air flows in the brake valves and the dynamics of moving mechanical parts. For various simulation purposes, separate partial models with different levels of accuracy were created. Various verifications and identifications of the models were performed with the use of train brake testing facilities, including both in-house and other test stands. A variety of examples of simulation results are presented here.     

基于无线通信的无缝漫游模型

为了保证列车在高速行驶过程中,与轨旁不同接入点之间进行数据传输的连续性,提出一种利用列车长度特点的无线信号切换模型,通过软件合理调度车头和车尾的信号源,有效避免了新链路的网络连接延迟时间对传输通道的影响,把新链路的网络连接延迟时间压缩为0,实现了列车的无缝漫游。     

Stability and performance analysis of a full-train system with inerters

This paper discusses the use of inerters to improve the stability and performance of a full-train system. First, we construct a 28 degree-of-freedom train model in AutoSim, and obtain a linearised model for analysis in Matlab. Then, the benefits of inerters are investigated by the critical speed, settling time and passenger comfort. In addition, we apply a new mechatronic network for further performance improvement, and synthesise the optimal electrical circuit for experimental verification. From the results, inerters are shown to be effective in improving the stability and performance of train systems.     

地铁车辆段列车追踪系统设计与应用

为了能够有效提高地铁车辆段列车运营管理效率,研发了具有在车辆段内列车自动追踪功能的车辆段ATS系统。主要从系统结构、可靠性措施、功能原理和工程应用等方面对该系统做出了具体的介绍。     

节能列车操纵的思路及方法

针对机车司机操纵列车时存在不合理的能源消耗这一问题，从列车运行中各种机械功的组成及转化规律入手，根据列车运行需要及操纵经验，对节能列车操纵的思路及方法进行了分析论述。     

现代高速列车维修新进展

论述了现代高速列车维修的新观念和新发展,其中包括高速列车维修的系统工程观点、故障和维修质量的新观念;高速列车维修制度的发展及其维修制度改革;阐明了高速列车维修相关技术的新进展,其中包括高速列车维修性设计、诊断技术、维修信息系统和维修基地。     

高铁动车组长距离降弓通过方案的研究与实践

研究分析高铁动车组长距离降弓惰行的应急方案，通过在高铁整个供电臂内组织动车组降弓惰行通过的试验，结合运行中的实际案例，验证了高铁上实施长距离降弓惰行通过方案的可行性，并提出应急处置时的相关建议。     

Interaction of vehicle and steering system regarding on-centre handling

For the on-centre handling behaviour of vehicles the steering system is absolutely important. To investigate the interaction of the vehicle and steering system a validated, especially tailored simulation model was developed. Some meaningful vehicle and steering system parameters are altered to show the influence on steering wheel torque, steering feel and understeer. The results underline the importance of an accurate steering system model. Identified measures to improve the centre feel and steering response were a stiffer torsion bar, a higher cornering stiffness or a lower overall steering ratio. The steering response, however, suffers when the centre feel is improved by a higher trail. The steering rack friction reduces mainly the steering response while the steering column friction decreases the centre feel whereas a stiffer torsion bar lessens the understeer tendency.     

中国与哈萨克斯坦铁路国际联运混编列车存在的问题及解决方案

对哈萨克斯坦铁路货车在我国境内运用中存在的问题进行了调查和统计分析,并提出了解决方案。