地铁列车DC 110V电路接地设计

对地铁列车DC 110V信号线接收电路的抗干扰设计进行了分析,并对几种DC 110V负线接地方法进行了研究,指出了各种接地方法的优缺点,推荐了一种较好的负线接地方法,并提出了DC 110 V屏蔽电缆屏蔽层的接地设计方法.     

地铁屏蔽门绝缘安装相关问题探讨

论述屏蔽门在城市轨道交通系统中的重要作用,指出需要高度重视屏蔽门的接地和绝缘系统的可靠性。通过分析目前城市轨道交通站台屏蔽门系统的绝缘结构,阐述其在施工、运营中存在的问题,提出相应的处理建议和措施,包括确定合理的绝缘指标、尽量避免外界干扰、加强施工质量控制等。     

谈铁路混凝土梁桥面防水

论述了桥面水对混凝土桥梁的危害,论证了设置桥面防水系统的重要性,提出了桥面系构造必须注意的要点,并介绍部分桥梁防水层的施工方法。     

Research on the Design of Career Development Channel for Employees in Large State-owned Construction EnterprisesEI北大核心

Research purposes: From the factors and the principles the enterprise employees' career development design should consider, this paper studied and further discussed channel setting, the division of hierarchy and width, positions or proportional control of all levels, qualification criteria of all levels to determine, career development path management, to solve the problems of the large state-owned construction enterprise, such as narrow development channel, less promotion platform, and insufficient continuous motivation of professionals, technical operators, and general management personnel, resulting in employees no passion, no fighting will, not dedicated, difficult to bring in talents and high attrition rates of talents. Research conclusions:(1) The design of employees' career development should consider four aspects: attractiveness, operability, practicality and pertinence. (2) The design of employees' career development should follow the principles of systematic, overall and long-term development. (3) The design of career development channel should be mainly considered from the aspects of post setting, channel hierarchy and width division, and job qualification criteria. (4) The research results can provide a reference for the design and research of career development channels for employees in state-owned construction enterprises. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

A New Technique of High-performance and Fast Tensioning Prestressed Anchorage CableEI北大核心

Research purposes: The large-span transition section tunnel of the Badaling Great Wall station on the Beijing-Zhangjiakou high-speed railway with the maximum excavation width of 32.7 m, and the largest excavation area of 494.4 m 2 , is the world's biggest traffic tunnel in the world with the largest excavation width and excavation area, which has difficult construction and high security risks. The initial support system of tunnel is mainly realized by prestressed bolt, prestressed cable and shotcrete. After test, anchor cable tension using the traditional anchor cable construction technology can't meet the design requirements, at the same time, it takes about 30 days to achieve prestressed tensioning. Therefore, we need to study the high-performance fast tensioning prestressed anchor cable technology, to effectively control surrounding rock deformation, to ensure the safety of construction, improve construction efficiency. Research conclusions:(1) The traditional anchor cable construction technology is adopted. The anchor cable tension value is mainly controlled by the grip force between the anchor rope and grouting body and the cohesive force between grouting body and surrounding rock. (2) The grip force between the anchor rope and the grouting body can be increased by about 2 times by increasing the "barb"; The cohesive force between the grouting body and the surrounding rock can be increased by 1.5 times by 6 ~ 7 MPa high-pressure grouting process. (3) The modified sulphoaluminate cement slurry can reach more than 30 MPa within 1 day of the slurry strength, so as to realize fast anchor cable tension within 1 day after grouting completion. (4)The research results can be used for reference in similar prestressed anchorage cable construction projects. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

红神铁路格丑沟特大桥拱桥空间稳定性分析

以格丑沟特大桥136m钢管混凝土拱桥为研究对象,采用MIDAS有限元分析程序,建立空间有限元计算模型,得出常见的失稳屈曲模态;分析横撑样式及布置位置对拱桥稳定性的影响,为该桥的设计、施工、监控及维护提供参考。     

AP-8沥青混合料抗车辙性能浅析

结合苏州地区公路与城市道路应用实践,对AP-8沥青混合料的路用性能进行研究,并与常用的几种沥青混合料进行对比,结果表明采用纳米技术的AP-8改性剂可大幅度提高路面的抗车辙能力,与改性沥青以及目前常用的外掺剂沥青混合料相比,AP-8普通沥青混合料在技术经济和性价比方面均具有明显优势。     

基于CAN总线的汽车检测线网络系统设计改造

针对现有汽车检测线系统复杂的特点,在介绍现场总线技术和检测线结构的基础上。以CAN总线控制器SJA1000作为汽车检测线各单元的核心控制器,提出了基于CAN总线的汽车检测线网络系统设计改造方案。该方案简化了检测线网络系统结构,系统具有模块化、实时性和开放性等特点。实践表明,CAN总线技术在汽车检测线上的应用可以提高车辆的检测速度和质量,降低检测线改造和使用维护成本,具有较大的应用价值。     

快速公交系统在大城市的应用研究

城市化进程导致城市规模和人口密度不断增加,大城市内部交通时常出现拥挤.修建道路的步伐总不能很好地满足出行需求,同时小汽车数量的日益增加,使得出行越来越困难.快速公交系统由于其客流运送能力大、运送速度快的特点得到了世界各地的重视,通过与常规公交和地铁的对比分析,得出我国大城市应建立快速公交系统的观点.     

Contour line of load transfer ratio for vehicle rollover prediction

For vehicle rollover control systems, an accurate and predictive rollover index is necessary for a precise rollover threat detection and rollover prevention. In this paper, the contour line of load transfer ratio (CL-LTR) and the CL-LTR-based vehicle rollover index (CLRI) are proposed, describing LTR threshold and LTR change rate precisely, providing an accurate prediction of vehicle rollover threat. In detail, the CL-LTR is proposed via the roll dynamics phase plane analysis, and its analytical solution of one-degree-of-freedom vehicle roll model and extension for full vehicle are derived. Moreover, the predictive CLRI is proposed and evaluated via vehicle dynamics study. The results demonstrate that vehicle rollover threat is predicted accurately based on the CLRI, which shows benefits for the vehicle rollover prediction and stability control.