桥式起重机轮跨比研究

介绍了桥式起重机轮跨比与桥架的自锁有密切关系的理论基础,详述了国内外相关技术资料关于轮跨比的推荐值,对国内外同类产品的轮跨比进行了详细的统计分析,并阐述了轮跨比与啃轨之间的关系,说明如果轮跨比取值较小时,务必保证产品的制造、安装工艺,严格满足各项要求.     

Combined empty and loaded train scheduling for dedicated freight railway corridors

The efficient utilization of expensive rolling-stock has become imperative for all railroads. In this paper, we study the combined empty and loaded train-scheduling problem for the upcoming dedicated freight corridors in India. Existing optimization models either do not consider the simultaneous optimization of the loaded and empty flows or are not solvable for large railroads. Our model is the first of its kind to incorporate link capacity constraints in an IP formulation for this operational level problem. A simulated annealing algorithm hybridized with a constructive heuristic is proposed as the solution method. The computational experiments show that the proposed heuristic performs well both in terms of runtime and solution quality.     

Online-review analysis based large-scale group decision-making for determining passenger demands and evaluating passenger satisfaction: Case study of high-speed rail system in China

High-speed rail (HSR) has become an essential mode of public transportation in China and is likely to remain so for the foreseeable future. To promote the development of the HSR industry, a high level of passenger satisfaction must be ensured, which means that passenger satisfaction must be assured. Focusing on HSR in-cabin factors that affect the travel experience of HSR passengers, this study aims to determine passenger demands (PDs) and to evaluate passenger satisfaction by using a combination of online review analysis and large-scale group decision-making (LSGDM). By using web crawler technology, online reviews related to HSR were harvested from a microblogging platform to extract PD data and information. The six PDs that reflect the most frequent concerns of passengers were identified by analyzing the online reviews. The level of satisfaction of passengers with respect to these PDs was analyzed based on the online responses from 100 HSR passengers and by adopting the interval-valued two-tuple linguistic representation model. The final degrees of satisfaction and rankings of the PDs were then determined by using the LSGDM approach with the k-means clustering method and a consensus-reaching process. This research thus constructs an index system of HSR passenger satisfaction evaluation based on online-review analysis and evaluates the process by using LSGDM approaches. The conclusions provide insights into the improvements desired by HSR passengers for in-cabin services and to improve passenger satisfaction.     

铁路重伤钢轨倒序焊复维修关键技术

针对铁路重伤钢轨采用铝热焊方法维修接头病害多、运营期间断轨率高的工程问题,采用YHGQ-1200气压焊轨车,其上配置全自动数控气压焊轨机。采用倒序法焊复施工,即焊轨车先在线下对插入轨的前端进行无应力焊接,焊后保压正火热处理,然后插入轨入槽,焊轨车退回停车位,再采用金属轨枕垫将距插入轨后端焊口20 m钢轨垫高,焊轨车爬坡至焊接工位,在线上进行应力焊接和焊后保压正火热处理。采用气压焊轨车这种在线焊复的标准化施工技术,作业过程安全,工艺稳定性良好,焊头品质优异,一次焊接锁定作业高效,施工方案简单、经济。     

重轨热锯机变速技术应用

介绍了鞍钢股份有限公司大型厂热锯机为满足产品多样化需要,实现热锯机变速功能的软硬件配置情况,着重介绍了各种变速方案具体设计思想及优缺点以及最终实施的方案。通过介绍PLC内程序的编写和SIEMENS数控器的设置,详细阐述了变速技术的实现原理。     

柴油发动机高压共轨燃油喷射技术研究

本本文介绍了柴油机电控燃油喷射技术的发展历程。阐述柴油机高压共轨电控燃油喷射系统的基本组成、工作原理、特点及未来研究方向。     

跨座式空中轨道系统杆件制造工艺研究

介绍了跨座式轨道交通的特点及轨道梁、支座、立柱等典型构件,着重阐述了这些典型构件的制作工艺、焊接变形控制及质量控制技术,为后续类似工程的设计和施工提供了参考。     

基于铁谱分析系统的机床健康检测

对某机床厂的龙门导轨磨床MMA52160A利用铁谱分析技术的油样进行定期检测,及时地掌握龙门导轨磨床的磨损状况.通过实验与分析发现,在检测时间段内导轨磨床内部存在着正常磨损、切削磨损、滚滑复合磨损磨粒以及铁的氧化物,在数量上以正常磨损居多,其它类型磨粒数量较少,可以判断导轨磨床仍处于正常运行状态.实验表明,铁谱分析技术可以对机床的运行状态进行预报故障;同时,可合理地确定机床的换油周期,节省油料,做到科学润滑,以延长龙门导轨磨床的使用寿命.     

地铁列车运行对环境振动的影响数值分析

结合郑州地铁1号线工程实例,对比分析了郑州城市轨道交通在采用不同减振轨道形式下,隧道壁和土体对地铁振动传播的影响,为后续的轨道专业设计提供一定的理论依据。     

手工电弧焊接QU120钢轨实践

分析了Qu120钢轨在使用过程中接头断裂的成因，结合现场实际介绍了钢轨手工电孤焊接方法、焊接材料、焊接工艺、实际操作体会，可供同类型的钢轨整体焊接借鉴。