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。     

CM模式在我国城市轨道交通项目管理中的应用

为探索城市轨道交通建设项目管理模式,本文在揭示了目前城市轨道工程特点及存在主要矛盾的基础上,介绍了新型CM建设管理模式的特征和优点;分析了在我国城市轨道交通建设领域采用CM模式的必要性和可行性,提出了推行CM模式的相应方案和步骤。     

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.     

宁波轨道交通轨道振动预测研究及优化

在轨道交通初步设计阶段地下线轨道减振设计中,对距外轨中心线两侧10~60 m范围内的环境敏感点,往往采用踏勘、工程类比等经验方法进行设计,具有一定的误差。在采用《环境影响评价技术导则城市轨道交通》(HJ453—2008)振动预测模型的基础上,参考北京、上海等城市的经验,研究适用于宁波轨道交通地下线轨道振动预测模型,并采用计算机语言实现预测模型程序化以提高设计效率。在初步设计阶段,振动预测的标准化、自动化,对稳定区间轨道高度,细化概算投资,减少设计反复具有重要意义。     

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。     

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.     

基于GPS的公交运营动态调度策略研究

本文从智能公交系统入手,介绍了GPS在智能公交系统中的应用,提出了将GPS车辆定位技术应用到公交运营的实时信息采集中,对公交车辆运行状况和运营服务水平进行实时监督,提高公交服务水平和公交运行稳定性.针对车辆“早点”与“晚点”的动态调度控制策略,对车辆运行过程进行实时调度控制,并建立动态控制的一个较为实用的模型.     

城市公共交通特许经营合约模式选择研究

本文对总成本合约与净成本合约的特点与区别进行了分析,对合约模式选择中所应重点考虑的影响因素进行了研究,针对总成本合约中的不足提出改善建议.为城市公变特许经营的城市提供指导.