局域轨道交通系统规划编制思路和方法探讨——以上海市宝山区为例

宝山区作为上海市北部门户,要积极加强对外辐射和对内联系,推动上海大都市圈一体化协同发展,客观上需要进一步强化交通功能,完善综合运输体系,形成上海北部枢纽。从轨道交通市域线、市区线、局域线三个层次,对区内轨道交通系统规划编制思路、客流预测、线网规模、布局方案等进行了探讨,以期对区域总体规划编制提供参考和借鉴。     

俄罗斯货车制动系统的改进

分析了俄罗斯国内及国外制动机的设计方案,提出了适应独联体国家铁路制动机运用检修条件的新方案。     

加速公路运输业向物流的发展和融合

面对物流的新课题,一方面,运输企业要抓住机遇努力向现代物流融合,另一方面,也要从实际出发,循序渐进,充分利用现有设备,包括利用客户和其他行业现有的设施和设备,注重在调整、重组中发展物流.只有这样,我国公路运输业的现代化进程才能跃上一个新台阶.     

Prediction of wheel wear in urban railway transport: comparison of existing models

One of the most important maintenance costs in tramway transport comes from wear of wheel profiles. In the highly competitive railway market, the prediction of wear is then a major concern of the constructors. In this article, we present and compare four models well adapted to tramway conditions, involving contacts on the rolling tread and on the flange with very different sliding and pressure conditions. Moreover, all models can be implemented from the natural outputs of the railway simulation packages classically used in industry for the dynamics design of the vehicles. The first one, proposed by Jendel, is based on the well-known Archard's wear model. Enblom continues Jendel's approach by taking into account the contribution of wheel deformation on the sliding velocity. The last two models, developed by Zobory, and Pearce and Sherratt, determine the wear from the energy dissipation in the contact area. The models are first compared on a theoretical basis and, for that purpose, are rewritten in a common form. Two cases are distinguished: mild wear as arising on the rolling tread and severe wear as arising on the flange. The models are also compared in the practical case of an urban transport vehicle running on circular tracks with different curve radii. Although the models show equivalent trends according to the theoretical study, important discrepancies appear between estimated wear depths. All models are actually dependent on experimental coefficients and it is likely that they were estimated in different conditions. On the other hand, a reasonable agreement can be found in some particular conditions. As an example, Zobory's, Enblom's and Jendel's models are very close to each other in severe wear conditions. This work shows that a general and reliable model could probably be developed from all positive aspects of the existing ones.     

客货共运线路轨道不平顺不利波长的分析研究

我国铁路主要是客货共运线路,客车的速度可达140～160km/h,而货车的速度只有80km/h左右。货车与客车的车辆结构动力性能存在较大的差异,所以对轨道结构的几何形位的要求也有所不同。为了使客车和货车都能在同一线路上安全、平稳地运行,则必须对轨道不平顺与车辆运行平稳性和安全性之间的关系进行研究。本文利用计算机动力模拟仿真计算轨道不平顺激扰下客车和货车的动力响应,对轨道随机不平顺与不同类型车辆的车体加速度之间的关系进行了相干分析和功率谱分析,计算得出了引起客车和货车较大动力响应的轨道不平顺不利波长。然后对两者的不利波长进行了分析,归纳出了客货共运线路的轨道不平顺不利波长范围,为现场轨道不平顺的养护维修和管理提供了理论和实践指导。     

120km/h交流传动货运电力机车主变压器设计

介绍了120km/h交流传动货运电力机车使用的JQFP-9000/25型主变压器的主要技术数据、设计特点、主要结构及其有关参数的试验结果。     

铁路货物运输的随机过程分析和及时送达概率估计

应用随机过程理论，分析铁路运输系统中货物及时送达的概率分布，得到货物运输延续时间的平均值，为实现用户要求的运到期限提供了合理保证，并可通过评估与货主商定的运到期限与实际货物送达时间误差的概率，来找到货物及时送达过程中的关键环节，改进货物送达流程。最后举例说明它的应用。     

我罗斯新一代货车转向架的研濑和综合试验结果

介绍俄罗斯近年来20t、23．5t、25t和30t轴重货车转向架的研制情况，重点介绍25t轴重转向架的结构和综合试验结果。     

城市轨道交通最新技术及评定

文章对城市轨道交通系统进行分类、并对其最新发展和商业化运营趋势及其所用的安全评定方法进行了论述.     

公共交通枢纽换乘算法设计

对公共交通枢纽换乘算法设计,换乘分为直达线路,一次换乘,二次换乘,换乘算法的具体设计分为两个步骤1、构造并求解换乘矩阵,获得公交换乘方案(即从起点到终点最少换乘次数,及换乘站点).2、根据最少换乘次数,缩小求解范围,求解起始站点与目标站点间的最短路径,进而得到最佳路径.