高速铁路调度系统的人机关系安全评估

高速铁路调度系统是现今中国高速铁路行车安全的重要保障,主要表现为人机关系的平衡、协调。由于调度系统本身存在的复杂性使其很难被作出准确的安全评估,采用基于层次分析法的灰色理论对高速铁路调度系统进行安全评估,最后,通过实例证明该方法具有科学性和可行性。     

基于气动噪声的城际列车空调导流罩外形优化

采用NLAS方法对某时速250 km/h城际列车进行气动噪声数值分析,重点研究了空调区域噪声源的分布特性.根据仿真分析结果对客室空调导流罩的四个边缘和四个角点进行了优化,优化后导流罩的最大声压级为110 d BA,比原方案的声压级降低6 d BA.     

兰州铁路局货运生产布局优化探析

分析了铁路局直管站段体制下,兰州铁路局货运生产布局的现状及存在的问题,提出了货运集中化、整合货运营业站货运业务和零担货物运输整合的措施,并对优化布局的有利性进行了探析。     

新建时速200 km客货共线铁路综合功率因数计算

研究目的:近年我国铁路建设事业迅猛发展,新建了大量时速200 km的客货共线铁路,由于新建线路上运营机车种类繁多,而电力部门又对铁路功率因数考核严格,因此需对牵引变电所功率因数进行研究。研究方法:通过对各种牵引负荷综合功率因数的计算来确定牵引变电所的功率因数。研究结果:利用此方法能较准确的反映牵引变电所的功率因数。研究结论:通过综合功率因数计算,可以较准确地求出客货共线线路开行不同类型、不同对数列车时牵引变电所的功率因数。     

120 km/h货车提速综合试验动力学性能分析

我国提速综合试验既是对列车在提速条件下对线桥设备(包括钢轨、轨枕、道岔、路基、路桥过渡段和桥涵等)的动力作用的试验,又是对车辆动力学性能进行的一个充分的验证性能试验。文章通过对比分析近年来我国提速综合试验的测试线路、试验车辆、运行特点和测试数据,对我国综合提速试验中120km/h货车动力学性能进行了比较全面的总结与分析,指出了我国120km/h货车动力学性能方面存在的主要问题,并提出了解决问题的建议。     

推进铁路货运集约化经营问题的探讨

分析郑州铁路局存在的货运营业站布局不合理、专用线尚不具备整列取送条件等问题,提出通过整合中间站,整合零担、集装箱和危险货物运输业务,建设战略装车点等措施,以加快铁路货运集约化经营步伐,提高货运工作效率和效益。     

港口吞吐量概率预测模型研究

为了模拟港口重叠腹地货运流向情况,并对新建港口吞吐量进行合理预测,引入了概率交通方式预测模型并对其进行改进,且在此基础上建立了负指数货运量概率预测模型。将该模型应用于徐州地区新建港区的货运量分析,预测结果表明新模型具有一定的实用性,可以为港口规划和建设规模的确定提供重要参考。     

Modelling and analysis of the crush zone of a typical Australian passenger train

In this paper, a three-dimensional nonlinear rigid body model has been developed for the investigation of the crashworthiness of a passenger train using the multibody dynamics approach. This model refers to a typical design of passenger cars and train constructs commonly used in Australia. The high-energy and low-energy crush zones of the cars and the train constructs are assumed and the data are explicitly provided in the paper. The crash scenario is limited to the train colliding on to a fixed barrier symmetrically. The simulations of a single car show that this initial design is only applicable for the crash speed of 35 km/h or lower. For higher speeds (e.g. 140 km/h), the crush lengths or crush forces or both the crush zone elements will have to be enlarged. It is generally better to increase the crush length than the crush force in order to retain the low levels of the longitudinal deceleration of the passenger cars.     

Preliminary studies concerning the application of different braking arrangements on Italian freight trains

Freight wagons are usually equipped with the standard Union Internationale des Chemins de Fer pneumatic brake. On long trains, the propagation of the pneumatic signals along the pipe and different braking/loading conditions may produce delays and/or differences in the application of the braking effort along the train. This phenomenon may cause heavy longitudinal forces exchanged between wagons through buffers and draw gear. In particular, the workgroup n.6 (freight trains composition) of the Italcertifer committee has performed some preliminary studies concerning the application of LL braking operative conditions on freight wagons trains travelling on Italian lines. Partners have cooperated in this workgroup; however, in this paper, the attention is focused on methodologies and results concerning the contribution of University of Florence. The results of this activity, coordinated by RFI-CESIFER have been used to emanate the 20/07 rule of the RFI (‘Modifiche alla Prefazione Generale all'Orario di Servizio’) which modify the composition criterion rules of freight trains on the Italian Railways in order to introduce and discipline the application of the LL braking operative condition.     

公路货运抽样调查数据自动采集系统应用措施研究

公路货运抽样调查数据自动采集系统是利用科学技术进行数据自动采集与传输,并能避开人为干扰因素.具有很好的推广应用价值.