基于物联网技术的地铁机电设备全寿命周期管理系统

地铁运营设备种类繁多,其中机电设备在设备管理中占据重要的地位。而物联网技术的发展实现了多领域、多模块、多方向的信息互联共享,面对各个维度数据交融建立合理的分析管理平台是今后智慧城市智慧地铁的发展趋势。基于郑州地铁运营的设备管理体系,拓展全景信息支撑平台、状态监视、在线预警、智能诊断、状态评价、风险预测、检修决策以及绩效评估等方向。搭建地铁机电设备的大数据管理系统框架,通过现有的数据构成利用机器学习算法有效地进行数据挖掘。同时针对全生命周期成本分析、运维检修决策、风险量化评估3个方向进行算法模型分析,从而获取地铁机电设备的相关潜在规律,为决策层提供更多有价值的信息。     

Real-time implementation of a traction control algorithm on a scaled roller rig

Traction control is a very important aspect in railway vehicle dynamics. Its optimisation allows improvement of the performance of a locomotive by working close to the limit of adhesion. On the other hand, in case the adhesion limit is surpassed, the wheels are subjected to heavy wear and there is also a big risk that vibrations in the traction occur. Similar considerations can be made in the case of braking. The development and optimisation of a traction/braking control algorithm is a complex activity, because it is usually performed on a real vehicle on the track, where many uncertainties are present due to environmental conditions and vehicle characteristics. This work shows the use of a scaled roller rig to develop and optimise a traction control algorithm on a single wheelset. Measurements performed on the wheelset are used to estimate the optimal adhesion forces by means of a wheel/rail contact algorithm executed in real time. This allows application of the optimal adhesion force.     

某甩挂运输半挂牵引车的轻量化设计

以节能减排为目的,以某甩挂运输牵引车为研究对象进行轻量化设计.采用盘式制动器、少片簧等新技术;针对轮辋、变速器壳体、油箱、散热器、接头等采用铝合金与尼龙等新材料;采用单层纵梁、短轴距等新结构以及轻量化驱动桥.最终,使该牵引车的整备质量降至8 200 kg以下.经过有限元分析、台架试验及整车可靠性试验,验证了所采用轻量化设计方案的可行性.     

基于DOE与遗传算法相结合的共轨柴油机喷射参数优化

将DOE与遗传算法相结合对共轨柴油机喷射参数进行优化,并对优化方案进行了燃烧分析和试验验证。针对某型共轨柴油机,利用DOE设计了77种共轨柴油机喷射参数技术方案,再以响应面近似模型技术构造优化目标函数,利用遗传算法对该近似模型进行寻优。试验结果证明优化后柴油机油耗降低5%,NOx降低10%,碳烟降低18%。     

城市轨道交通综合监控系统集成研究*

从地铁综合监控系统集成的概念出发,论述了综合监控系统集成理论体系框架、综合监控系统集成框架、综合监控系统的构成,为城轨交通综合监控系统集成的选择和决策提供一定的借鉴。     

车辆段接触轨和架空柔性系统比较分析

车辆段采用接触轨和架空柔性悬挂技术都已经很成熟.技术数据比较,接触轨在走行轨电位和电磁影响方面与架空柔性系统基本相同,在结构形式、供电可靠性、牵引网电压、牵引网能耗和使用寿命方面强于架空柔性系统.架空柔性系统在安全防护、运营维护和设备费用方面较接触轨有优势.二者设备器材都实现了国产化.     

支撑城镇化发展的市郊轨道交通规划问题探讨

当前新型城镇化发展战略已成为我国社会经济实现持续健康发展的重要途径之一,而交通运输系统作为城镇化发展的重要支撑与其存在密切的双向互动关系.鉴于此,基于新型城镇化发展战略视角,对市郊轨道交通的建设意义、功能定位及特征进行了重新的审视与深入的分析,在此基础上对包括线路布设、站点规划设计以及系统制式等方面的市郊轨道交通规划相关问题进行了较深入的探讨.     

基于子模型法的斜拉桥塔梁墩固结段局部分析

在对大跨径斜拉桥整体结构有限元分析的基础上,应用子模型法对斜拉桥塔梁墩固结位置进行了有限元结构受力分析,计算了4种不同工况下结构的应力应变状态。研究表明:子模型法可以更为精确有效地计算斜拉桥塔梁墩固结处的应力分布情况,计算结果可作为大跨径斜拉桥塔梁墩固结处局部设计和施工的参考依据。     

大桩帽轨道梁不同支承条件的受力分析

通过ANSYS软件对轨道梁的弹性点支承、刚性点支承、分布弹性支承以及空间模型进行有限元模拟,得出不同模型下的连续梁内力以及支座反力,并对不同模型的计算结果进行比较分析。计算结果表明,弹性点支承与刚性点支承模型在计算宽支座梁支座负弯矩时与分布弹性支承模型及空间模型差异较大,在支座边缘处采用弹性点支承模型计算弯矩削峰的方法已不再适用,同时得到宽支座梁支座反力、剪力等分布规律,可供大桩帽连续梁设计参考。     

Tracks to Change or Mixed Signals? A Review of the Anglo-Saxon Literature on the Economic and Spatial Impacts of High-Speed Rail

ABSTRACT

The economic development and spatial impacts of high-speed rail (HSR) are quite varied and mixed. Studies of economic impacts of HSR fall into two categories: predictions and empirical observations. We first review studies that examine predicted HSR impacts related to job growth, real estate development, and other economic effects. These are followed by studies examining observed effects of realized projects using the same categories. Several patterns emerge. Predictive studies are largely optimistic of the rail's positive effects. On the other hand, observational studies tend to identify both benefits and shortfalls. Yet, neither of these patterns are universal and depend on a number of other factors. One consistent pattern is that gains associated with HSR appear to be stronger in first-tier cities. Nevertheless, certain small towns and second-tier cities have undergone noteworthy transformations as a result of HSR, especially where the public sector has actively pursued new investment.