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本文从列车速度、服务水平、鲁棒性、弹性及列车运行水平5个方面,构建列车运行图质量评价指标体系,通过AHP计算各指标权重,构建广义模糊软集模型确定列车运行图综合得分系数,实现列车运行图编制质量评估。为了对算法效果进行验证,以徐盐、连淮铁路网络中京沪高铁南京南至徐州东段、徐兰高铁徐州东至商丘郑徐场段、青盐铁路青岛北至连云港段三条线路为例进行运行图质量评价。结果表明,京沪高铁南京南至徐州东段的运行图综合质量最好,青盐铁路青岛北至连云港段运行图综合质量最差。 相似文献
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通过图解法和分析计算法,定量分析了不同列车停站模式和不同列车运行线铺画方式下列车停站对通过能力扣除,明确最有利于能力利用的停站模式和运行线铺画方式。结合西成高铁实例,利用扣除系数法对西成高铁不同等级列车比例、不同运行线铺画方式下的通过能力进行计算,得出西成高铁最有利于能力利用的列车停站方案,总结发现提高直达列车比例、减少停站最多列车停站次数、合理的列车运行线铺画方式有利于高速铁路通过能力利用。 相似文献
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铁路运输态势的推演与评估方法是铁路运输态势推演系统(Railway Transportation Situation Deducing System,RTSDS)的重要理论依据,该系统能够精准地掌控运输生产演化规律和预见可能出现问题,提升调度生产工作的管理水平。本文通过分析调度员所进行工作和任务,提炼得到相关信息作为列车运行态势的子态势指标。基于双激励的动态综合评价模型,本文对列车运行态势以及各项子态势进行了动态评价。本文的评价方法可以动态地评价普速铁路列车运行态势的优劣,同时在普速铁路列车运行态势劣化时得出其中较劣子态势,为调度员进行调度决策提供参考。 相似文献
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利用数据包络分析(DEA)方法进行效率计算时,若有新增参评样本则下阶段计算时旧样本的效率计算结果可能会随之改变,针对此问题,引入反向传播神经网络(BPNN),基于含偏好序的DEA-CCR模型效率计算结果进行训练,构建DEA-BPNN效率计算模型,在不影响旧样本阶段计算结果的前提上计算新增样本效率。以杭深线厦深段高速列车运行图为例,根据运行线技术指标,利用DEA-BPNN高速列车运行线效率计算模型对2021年第1季度和第2季度厦深段运行图的本线高速列车进行效率计算,研究结果表明,第1季度厦深段本线列车平均效率为0.946,而第2季度本线列车平均效率达到了1.048,说明2021年第2季度厦深达速调图后运行线效率相较上一季度有较大提升。 相似文献
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Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD). An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip. It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links. 相似文献
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《Transportation Research Part A: General》1991,25(6):407-418
The main deficiency of most current modeling approaches to transportation can be identified as neglect of the integration of existing geographical knowledge in regard to the ex ante transport/land use modeling approaches, with its focus on territorial dynamics and theory development. This paper addresses this aspect of the problem by introducing a theoretical and methodological framework for the analysis of the interrelationship between land uses. The analysis attempts to determine to what extent the functional land use in a city can be considered an ordered pattern. The order sought does not rely on purely spatial configurations, but on the correlation of transportation and land use. The first section of this paper focuses on theoretical considerations. It stresses the fact that conventional approaches do not apply in the present context. It then suggests an alternative based on areas of influence and measured in terms of level of attractance of land uses. The second describes a procedure based on this alternative following the remarkable contribution of Hanjoul, Beguin and Thill. An application of this procedure to the analysis of Shanghai is then examined. Finally, an evaluation of the strategies for optimizing the interrelationship between land uses is presented. The paper concludes with a possible research agenda. 相似文献
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介绍了城市轨道交通工程中杂散电流不同的监测系统的构成,分析了集中式、分散式和智能型等监测系统的配置和功能,以及智能型实时在线监测系统的重要意义,为轨道交通工程杂散电流监测系统的选择与应用提供参考。 相似文献
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明确埋地管道防腐保温层的技术评价标准,对埋地钢质管道的安全运行,延长管道使用寿命具有重要意义。为了对埋地管道防腐保温层做出有效评价,从间接检测与开挖检测2个方面,结合现场检测数据,提出了基于防腐保温层的电流衰减率、绝缘电阻率、质量状况与厚度的分级评价标准及基于4种评价指标的综合评判方法。工程实践表明,该评价标准对防腐保温层是否存在失效能做出有效判断。 相似文献
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《Transportation Research Part A: General》1982,16(5-6):363-370
The paper considers the possibility of quantitative analysis of behaviour, with particular reference to travel behaviour, from a methodological standpoint. The chief conclusion is that the nature of the subject implies that disaggregate statistical analysis is the most useful technique. The relationship of this methodology to theoretical issues is discussed, concluding that general theoretical issues are not susceptible to empirical resolution. The theoretical framework essential to analysis or forecasting of behaviour must therefore be established a priori The paper concludes with a discussion of the practical problems and achievements of disaggregate analysis. 相似文献
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天然气自动计量系统有多种组态软件,由于软件的不相通性,造成了计量系统数据采集的通用性差、数据传输与入库的时效性差、数据利用的可靠性低.结合各组态软件的实际情况,从设计上充分利用Oracle大数据处理能力以及Partition(分区表)的特性,实现历史数据的存储,应用WebService与COM+数据访问组件提供多层数据访问架构,采用OPC与DDE工业数据交换协议,实现了各站场计量数据的实时上传,为连续数据采集和实时监控提供了可能,节约了改造成本. 相似文献
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This paper estimates the efficiencies and productivity changes of 12 international airports in the Asia-Pacific region based on data from 1998 to 2006. We apply stochastic frontier analysis (SFA) to compute efficiency estimates and use the Malmquist productivity index (MPI) to analyze productivity changes. We use the SFA model with a translog-type production function after testing the statistical hypotheses. According to the results of the SFA hypothesis tests, airports have experienced a technological regression; the deviations from the efficiency frontier are caused more by technical inefficiency than random noise. However, the inefficiency was found to decrease. The MPI reveals a declining trend resulting more from technological change than from efficiency change, with a decrease in inefficiency. Taken together, both the hypothesis tests and the MPI not only provide consistent conclusions, but also suggest that airports should concentrate on technological progress. 相似文献