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通过分析速度为160 km/h货车转向架摇枕的结构特点,选用ANSYS软件作为有限元分析工具,根据摇枕结构特征及载荷情况,按照与实际相符合的原则建立摇枕模型。依据TB/T1335-1996《铁道车辆强度及试验鉴定规范》,对该货车摇枕的主要载荷进行计算和工况分析。由于摇枕结构复杂,需要用第四强度理论进行评价,即用当量应力对静强度进行了评定。 相似文献
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为满足铁路新型提速桥梁的安全运输要求,在理论分析及计算的基础上,对既有8149型专用桥梁转向架提出了3种改造方案。方案一为增加转向架下架体纵梁的弯曲强度,在其两侧加焊腹板,并对改造前后的应力进行了计算。方案二和方案三针对现有转向架的状态提出改造方案。改造后的转向架经检测符合部颁标准,能保障运输安全。 相似文献
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货物计算宽度公式中e值的修订 总被引:1,自引:0,他引:1
平车车辆上心盘中心偏离线路中心线的最大值(e值)对确定货物计算宽度和保证超限货物运输安全具有重要意义。目前,由于新型货车转向架的构造和性能发生了变化,通过对车辆各部载荷传递方式的分析,以车辆相关修程为依据,对e值进行了修订。 相似文献
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为研究高速动车组轴箱转臂定位节点的刚度演变,保障高速动车组安全、平稳、经济的运营,以CRH2型动车组轴箱转臂定位节点为研究对象,阐述轴箱转臂定位节点的结构组成、安装及刚度试验,探讨轴箱转臂定位节点在运营及疲劳试验前后的刚度演变过程。根据刚度演变情况进行安全性能分析,通过SIMPACK软件计算刚度变化前后,脱轨系数、轮轨横向力、轮轴横向力、磨耗系数的变化情况,并根据轴箱转臂定位节点的表面状态及刚度演变引起的动力学指标的变化,提出CRH2型动车组轴箱转臂定位节点在正常运营状态下最佳更换周期为5 a,为动车组检修及零部件更换提供参考。 相似文献
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铁路编组站构建货检安全保障体系的实践 总被引:1,自引:0,他引:1
为了确保提速干线货物列车运行安全,在丰台西站创建了货车装载监控中心.从监控中心的创建目的、创建理念、信息平台、作业流程、主要功能和取得的效果等6个方面,对系统在货车检测方面的重要保障作用进行了论述.货车装载监控中心的建立实现了货检作业过程的动态追踪、全程监控,为提速安全构筑了科学的保障防线. 相似文献
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用效用理论和多目标决策方法分析旅客对交通工具的选择行为,建立客车市场份额划分的计算模型。研究铁路提速和票价决策对铁路客运市场份额及运输收入的影响。 相似文献
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根据国家铁路货车周转时间的基本概念和计算公式,结合地方铁路货车运用特点,对地方铁路货车周转时间的计算方法进行了探讨。针对不同车辆所属和在地方铁路管内的运用情况,对车辆相关法和时间相关法的适用范围进行了阐述。 相似文献
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如果现在的预测是准确的,航空公司行业权力的天平在未来将会发生转变。尽管30年前,欧洲的航空公司手中握着航空货运的大权,但是如今这已经转到了中东和亚洲的航空公司手中。中东航空公司有钱,而且成本基础低,但是亚洲的承运人手中有货和全货机 相似文献
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在考察北美铁路货运发展特点的基础上,分析我国铁路在路网规模、技术装备、运输组织和市场份额方面存在的差距,提出以客户需求为中心,增强合作与开放意识;实施铁路大客户战略,加快"两整合一建设"步伐;积极调整货运产品结构,谋划铁路货运发展战略等铁路货运组织方式的改进建议. 相似文献
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Freight Trip Generation (FTG) in general and FTG modelling in particular are fields that are not concentrated upon as much as passenger trip generation. Therefore, the main objective of this work was to improve the understanding of the underlying processes that generate freight trips and through this understanding, to improve the modelling of FTG. To achieve this goal, the authors first had an extensive literature review to understand the reasons for the weaknesses of the current FTG modelling approaches. After identifying these weaknesses, some of them were brought to a focus in this work. One of the main weaknesses was the inadequacy of the classification system which was used to group commercial establishments in a set of standardized classes. Hence, firstly an experiment was conducted to create groups of logistical sites that had homogeneous FTG characteristics. It was observed that one of these segments had too many zero trips for a particular vehicle category, namely tractor-trailers. Then, to solve this problem, a new ‘conditional’ modelling approach for FTG modelling of this group and this vehicle category was proposed and tested using the data obtained from Kocaeli City Logistics Master Plan. This new hypothesised conditional approach aimed to find the probability of the segment generating tractor-trailer trips using the binary logit model and the generated trips given that the sites produced tractor-trailer trips using the regression technique. Afterwards, the models developed using the new approach were compared with the models obtained using only the common modelling approach of the regression analysis. The results indicated that creating homogeneous groups of logistical sites was possible and the new conditional modelling approach which was applied to one segment of the logistical sites for FTG of tractor-trailers, performed better than the regular regression modelling. Lastly, some recommendations for further improvement of this modelling approach were provided. 相似文献
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在分析货运工作量指标与货运收入关系的基础上,探讨工作量因素的变化对货运收入的影响,得出各工作量变化对货运收入影响的计算方法,并对北京铁路分局2004年一季度的实际情况进行了分析计算,提出了增加货运收入的对策。 相似文献
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April Kuo Elise Miller-Hooks Hani S. Mahmassani 《Transportation Research Part E: Logistics and Transportation Review》2010,46(6):1057-1070
A train slot selection model based on multicommodity network flow concepts is developed for determining freight train timetables for scheduling rail services along multiple interconnected routes. The model seeks to minimize operating costs incurred by carriers and delays incurred by shippers while ensuring that the schedules and demand levels are mutually consistent. A column generation-based methodology is proposed for train slot selection to meet frequency requirements. This methodology is embedded in a simulation-based iterative framework, where demand for rail services is re-computed in accordance with the train schedule obtained by solving the freight train scheduling problem. 相似文献
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铁路货物运输面临着市场份额不断下降的严峻形势。缺乏竞争意识、货物托运手续繁琐、乱收费和人员素质低、规章体系不合理、价格体系不适应是铁路货运市场份额下降的主要原因。建立铁路货运营销的基本对策和实施措施,是铁路制止货源下滑,摆脱经营困境,再造铁路运输企业辉煌的重要举措。 相似文献