起重机仿真训练器的研制与应用

通过对国内外港口装卸机械司机的培训状况分析,论述了在我国研制和应用计算机仿真训练器的现实意义和效益,提出了计算机仿真训练器的初步方案,并对其功能,结构和工作原理作了说明。     

窄轨重载铁路车辆滚摆振动的控制

介绍了澳大利亚昆士兰窄轨铁路在控制重载运煤车辆滚摆振动方面的研究成果.     

运用微机监测道岔电流曲线分析提速道岔故障

S700K电动转辙机正常道岔动作电流曲线与故障情况下动作电流曲线的对比观察,能及时发现道岔存在的隐患,以便查明原因,有针对性地采取消除措施,有效地提高现场设备的运用质量。     

RIGOROUS PROOF FOR CHARACTERISTICS OF PRACTICABLE MAGNETIC POTENTIOMETERS AND THEIR APPLICATION

IntroductionThe magnetic potentiometer or Rogowski coilhas been widely applied for measuring the heavyAC- current and pulsed current[1～ 3 ] . It has variousadvantages among which the following are of vitalimportance:1 The relation between the inducedoutput voltage in secondary winding and the differ-ential of the primary currents is exactly linear;2The output voltage is independent of the positionof the primary circuit;3 The outputvoltage is un-affected by stray fields of the current which …     

重载铁路特殊站场股道信号机设置问题的研究

重载铁路运输是一个复杂的系统工程,对于保证行车安全、提高作业效率和通过能力起关键作用的信号系统提出更高的技术要求.针对开行万吨、2万t组合列车线路设计中遇到的几种特殊站场布局下的信号机设置问题以案例形式进行分析,探讨此类站型信号机设置的影响因素,总结安全、合理的布置原则及运用要求.     

强电、雷电对客运专线通信影响的防护

介绍了强电对客运专线通信影响的分类、评估及其防护措施;雷电对通信影响的途径及其防护措施,并结合工程实例论述了相应的防护方法。     

强夯施工加固地基的原理及工艺——以张家口市城市快速路路基强夯施工为例

强夯法处理地基具有设备简单、施工便捷、适用范围广、节省材料、工期短等优点，在今后的工程施工中必将得到进一步的应用。     

用遮帘桩型式改造三峡库区大件设备运输码头

三峡库区大件运输具有临时性、短期性的特点,大件码头的建设大都采用老码头加固改造的方式.通过对三峡库区现有码头结构特点和库区水文条件的分析,提出用遮帘桩型式的改造方案,并对改造方案的结构稳定性进行了计算分析.遮帘桩型式改造三峡库区大件运输码头,结构稳定性能够满足要求,同时结构对航道的通航能力不产生影响,是一种可以应用到三峡库区及其他山区河流水库大件运输码头改造的方案.     

A closed-loop dynamic simulation-based design method for articulated heavy vehicles with active trailer steering systems

This paper presents a closed-loop dynamic simulation-based design method for articulated heavy vehicles (AHVs) with active trailer steering (ATS) systems. AHVs have poor manoeuvrability at low speeds and exhibit low lateral stability at high speeds. From the design point of view, there exists a trade-off relationship between AHVs’ manoeuvrability and stability. For example, fewer articulation points and longer wheelbases will improve high-speed lateral stability, but they will degrade low-speed manoeuvrability. To tackle this conflicting design problem, a systematic method is proposed for the design of AHVs with ATS systems. In order to evaluate vehicle performance measures under a well-defined testing manoeuvre, a driver model is introduced and it ‘drivers’ the vehicle model to follow a prescribed route at a given speed. Considering the interactions between the mechanical trailer and the ATS system, the proposed design method simultaneously optimises the active design variables of the controllers and passive design variables of the trailer in a single design loop (SDL). Through the design optimisation of an ATS system for an AHV with a truck and a drawbar trailer combination, this SDL method is compared against a published two design loop method. The benchmark investigation shows that the former can determine better trade-off design solutions than those derived by the latter. This SDL method provides an effective approach to automatically implement the design synthesis of AHVs with ATS systems.     

起重机常见机械故障分析及预防措施

分析了门座式起重机上钢丝绳、卷筒及滑轮、吊钩及其防脱钩装置、减速器齿轮、制动器，车轮与轨道及安全附件等部件引起机械故障的原因，针对性地提出了预防起重机发生机械故障的措施。