重载车轮对机械性能要求的研究

介绍了大秦线车轮的服役表现,探讨了重载运输条件下车辆轴重增加对车轮钢种特性的要求。根据重载运输条件,提出了我国重载车轮的研发思路,并据此进行了试验钢的开发,完成了实验室和工业性试制。检验分析结果表明,试验钢的性能指标基本上达到了预计目标,开发符合设计思路。     

以原有的数字生产地图为基础的地理信息系统建库

传统的数字生产地图是以出图为最终目的,而随着我国信息产业化进程的加快,地理信息系统的发展及其在各个领域的广泛应用,越来越多的用户要求实时提供多种空间和动态的地理信息。而以原有的数字生产地图为基础的地理信息系统入库是解决这一问题的最佳途径。     

秦皇岛港西港区集装箱泊位改造工程施工技术综述

对秦皇岛港西港区集装箱泊位改造工程施工中采取的综合技术措施和新工艺进行系统的介绍.这些工艺和综合技术措施在集装箱泊位改造工程施工中取得了良好的效果。     

Influencing driver chosen cornering speed by means of modified steering feel

This paper presents an investigation about influencing the driver's behaviour intuitively by means of modified steering feel. For a rollover indication through haptic feedback a model was developed and tested that returned a warning to the driver about too high vehicle speed. This was realised by modifying the experienced steering wheel torque as a function of the lateral acceleration. The hypothesis for this work was that drivers of heavy vehicles will perform with more margin of safety to the rollover threshold if the steering feel is altered by means of decreased or additionally increased steering wheel torque at high lateral acceleration. Therefore, the model was implemented in a test truck with active steering with torque overlay and used for a track test. Thirty-three drivers took part in the investigation that showed, depending on the parameter setting, a significant decrease of lateral acceleration while cornering.     

第2代单元列车车辆连接问题

介绍了国外第2代单元列车的车辆连接特点及其对降低列车纵向力的作用;对无间隙牵引杆的曲线通过性能与传统车钩缓冲装置作了对比;分析了第2代单元列车用缓冲器的型式及指标;对我国重载列车用无间隙牵引杆的参数选取及缓冲器的选型提出了建议。     

Coupler rotation behaviour and its effect on heavy haul trains

When a locomotive coupler rotates at an angle, the lateral component of the coupler force has an adverse effect on the locomotive's safety, particularly in heavy haul trains. In this paper, a model of a head-mid configuration, a 20,000-t heavy haul train is developed to analyse the rotation behaviour of the locomotive's coupler system and its effect on the dynamic behaviour of such a train's middle locomotive when operating on tangent and curved tracks. The train model includes detailed coupler and draft gear with which to consider the hysteretic characteristics of the rubber draft gear model, the friction characteristics of the coupler knuckles, and the alignment-control characteristics of the coupler shoulder. The results indicate that the coupler's rotation behaviour differs between the tangent and curved tracks, significantly affecting the locomotive's running performance under the braking condition. A larger coupler rotation angle generates a larger lateral component, which increases the wheelset's lateral force and the derailment coefficient. Decreasing the maximum coupler free angle can improve the locomotive's operational performance and safety. Based on these results, the recommended maximum coupler free angle is 4°.     

工程量清单计价配套机制建设

推行工程量清单计价办法的改革是一项复杂的系统工程。此文结合推行工程量清单计价改革的实践，针对相关配套体系建设中存在的不足，对实施工程量清单计价相关政策、机制和环境等方面的建设进行研究探讨，并提出具体的完善与改进的措施和建议。     

山区铁路曲线轨道综合强化技术的理论与实践

结合成都铁路局所辖线路的实际,扼要介绍了具有现 实普遍意义的山区铁路曲线轨道强化基本原理及曲线轨道综 合配套强化技术对策。     

水泥灌浆托换法在碎石桩复合地基中的补强应用

通过工程实例，介绍了水泥灌浆托换法在已有建筑物碎石桩复合地基补强中的设计、施工，以及在灌浆过程中存在的问题、处理方法和采取的措施。