UM Train

UM Train: 一维列车模块

　　UM Train模块用于一维列车纵向动力学分析。

　　UM Train模块可以模拟列车牵引、制动和空转等各种工况。其中每个车辆为一质点模型，具有一个自由度，不考虑轮轨关系，车辆之间用简化的车钩和缓冲器力元连接，用于纵向动力学仿真，计算速度快, 可以计算速度、加速度、牵引力和制动力。

UM Train: 三维列车模块

　　UM Train 3D模块集成了 UM Train和 UM Loco模块的功能。每个车辆通过UM Loco建立的完整三维模型，考虑轮轨关系车辆间通过三维车钩和缓冲装置连接，除了可以计算速度、加速度、牵引力、制动力等，还可以得到UM Loco中所有变量参数。模型精度高，总自由度数量大，计算相对耗时。UM Train 3D并支持一维和三维车辆模型的混合建模，即在一维列车模型中，加入若干三维列车模型(重点分析的对象)，三维车辆和一维车辆通过自动钩缓连接。可以任意设置三维车辆在列车中的位置。在保持模型精度的同时，大大减少系统自由度，缩短仿真时间。

建模方法

　　使用UM列车建模向导可以快速创建列车模型。

列车建模向导

　　首先, 从标准库选择所需的机车和车辆模型, 设置机车车辆长度和质量。软件自带的是俄罗斯标准的机车车辆库, 用户可以方便地添加本国的标准库。每个车辆都是一个子系统, 可以是最简化的单质量模型也可以是复杂的三维模型。

　　其次, 设置车钩类型。标准库包含了俄罗斯标准的车钩缓冲器, 用户可以根据自己的模型来修改定制。

　　然后, 进入仿真控制界面, 设置运行阻力、摩擦系数和制动缸压力等参数。

　　除了基础阻力, 还可以施加曲线阻力、坡道阻力等附加阻力。

创建轨道线路

　　最后, 设置轨道线路。UM Train提供专门的轨道线路工具, 可使用直线、圆曲线和样条曲线创建复杂线路。

 Publications

R. Kovalev, A. Sakalo, V. Yazykov, A. Shamdani, R. Bowey & C. Wakeling 
Simulation of longitudinal dynamics of a freight train operating through a car dumper
Vehicle System Dynamics, Published online: 16 Mar 2016  DOI: 10.1080/00423114.2016.1153115

Full paper (Free full access for first 50 downloads)

A heavy haul train and car dumper model was created to analyse train longitudinal dynamics during dumping. Influence of such factors as performance curve of draft gears, total free slack in couplers, operating mode of train positioner and braking of last two cars of train on the in-train forces was considered.

Dmitry Pogorelov, Vladislav Yazykov, Nikolay Lysikov, Ercan Oztemel, Omer Faruk Arar & Ferhat Sukru Rende
Train 3D: the technique for inclusion of three-dimensional models in longitudinal train dynamics and its application in derailment studies and train simulators
Vehicle System Dynamics, Published online: 11 Jan 2017  DOI: 10.1080/00423114.2016.1273532

Full paper (Free full access for first 50 downloads)

Algorithms for simulation of trains as coupled detailed spatial and simplified one-dimensional models of rail vehicles are considered. Such an approach to train dynamics allows evaluation of in-train forces and their influence on dynamic characteristics related, e.g. to the safety problems or ride comfort. Initially, the method has been developed for the analysis of derailment accidents and further it has been implemented as a mechanical solver in six-degrees-of-freedom train simulator TRENSIM, which features are discussed in the paper. An algorithm for parallelisation on multi-core processors for the simulation of rail vehicles and trains is presented.

Maksym Spiryagin, Qing Wu & Colin Cole
International benchmarking of longitudinal train dynamics simulators: benchmarking questions
Vehicle System Dynamics, Published online: 11 Jan 2017  DOI: 10.1080/00423114.2016.1270457

Full paper (Free full access for first 50 downloads)

Longitudinal train dynamics (LTD) simulations have been playing an instrumental role in the development of larger trains, especially freight trains. LTD simulators have been reported from all around the world, but without standards or standard questions to assess the correct implementation of LTD analysis and the state of LTD studies. Under this situation, the Centre for Railway Engineering initiated the International Benchmarking of Longitudinal Train Dynamics Simulators. Eight teams involving 10 institutions from five countries across three continents have participated in the benchmark and submitted their results. This paper describes the benchmarking questions so other researchers will be able to repeat the simulations in the future and benchmark their programs against the current participating software. The question information includes train configurations and characteristics of the wagon connection system, locomotive traction and dynamic brake characteristics, resistance formula, track data, train driving controls and output requirements. The question information will also enable researchers to replicate the benchmark by providing relevant formulas, data sheets, figures and descriptions.