首都机场线地面线无碴轨道选型及路基设计

根据首都机场线采用直线电机牵引系统的特点及要求,对地面线地段的轨道类型进行比选,确定采用长枕埋入式无碴轨道,对无碴轨道路基基础工后沉降进行分析,论述水泥粉煤灰混凝土（CFG）桩复合地基处理。     

寒冷地区单塔双跨自锚式悬索桥主缆架设施工技术

通过位于北方寒冷地区的哈尔滨市松北区发生渠FK2-3#公路桥悬索主缆的安装,介绍了寒冷地区单塔双跨自锚式悬索桥主缆的安装过程及控制要点;通过该桥主缆施工,总结了一套寒冷地区单塔双跨自锚式悬索桥主缆架设施工技术,对今后类似工程的施工有较高的参考价值.     

液货舱透气系统设计与计算方法研究

针对IMO通函以及ISO标准的新要求，本文从船东、船厂和船舶设计院所应履行职责的角度，对新建油船和化学品船透气系统的设计与计算方法进行研究，并给出了实例。     

石灰改善膨胀土填筑路基施工技术

介绍了在膨胀土地区路基施工中，由于膨胀于存实困难，裂隙发育，易风化、吸水膨胀降低强度等缺陷，为解决填料短缺，降低工程造价，提高路基强度和整体稳定性，采用在膨胀土中掺石灰，改善膨胀土的结构，达到提高路基填筑质量的目的。     

工业机器人在我国汽车生产中应用的技术分析

本文对汽车生产中采用机器人的应用领域进行了技术分析,就合理的选型、适宜的环境、完善的维护、恰当的布局等问题进行了深入的讨论。并指出应加强机器人技术的应用研究以适应未来10年我国汽车工业大发展需要。     

Carbody elastic vibrations of high-speed vehicles caused by bogie hunting instability

In particular locations of the high-speed track, the worn wheel profile matched up with the worn rail profile will lead to an extremely high-conicity wheel–rail contact. Consequently, the bogie hunting instability arises, which further results in the so-called carbody shaking phenomenon. In this paper, the carbody elastic vibrations of a high-speed vehicle in service are firstly introduced. Modal tests are conducted to identity the elastic modes of the carbody. The ride comfort and running safety indices for the tested vehicle are evaluated. The rigid–flexible coupling dynamic model for the high-speed passenger car is then developed by using the FE and MBS coupling approach. The rail profiles in those particular locations are measured and further integrated into the simulation model to reproduce the bogie hunting and carbody elastic vibrations. The effects of wheel and rail wear on the vehicle system response, e.g. wheelset bifurcation graph and carbody vibrations, are studied. Two improvement measures, including the wheel profile modification and rail grinding, are proposed to provide possible solutions. It is found that the wheel–rail contact conicity can be lowered by decreasing wheel flange thickness or grinding rail corner, which is expected to improve the bogie hunting stability under worn rail and worn wheel conditions. The carbody elastic vibrations caused by bogie hunting instability can be further restrained.     

The effect of wheel set gyroscopic action on the hunting stability of high-speed trains

This study explores the effects of wheel set gyroscopic action on hunting stability by calculating linear and nonlinear critical speeds. First, a dynamic model for a high-speed vehicle with 23 degrees of freedom is developed by considering wheel set gyroscopic action. The linear and nonlinear critical speeds are calculated by eigenvalue analysis and drawing a bifurcation map, respectively. Two computer programs for linear and nonlinear stability analysis are developed. Second, based on an actual high-speed vehicle in China, the effects of wheel set gyroscopic action on hunting stability are quantitatively investigated using computer simulation. Furthermore, the difference between the effects of gyroscopic moments about the x-axis and z-axis is discussed. The results show that the moment about the x-axis is harmful to hunting stability, but the moment about the z-axis is beneficial to hunting stability. However, the integrated effect of these two moments can enhance the critical speeds and suppress the hunting motion.     

高速铁路路基施工期沉降量的灰色预测模型及应用

为正确估算高速铁路无碴轨道路基施工期的沉降量,以京津客运专线工程为例,分别采用传统灰色预测模型和修正灰色预测模型对路基的沉降变形进行预测.研究结果表明:一方面,因为修正灰色预测模型对原始资料中已有信息的利用更加充分,所以,模型的精度更高;另一方面,修正灰色预测模型突破了传统灰色预测模型等间隔时序系统的限制,拓宽了模型在实际预测中的适用范围.因此.在实际应用中,推荐采用修正的非等时距灰色预测模型.     

基于ArcGIS Mobile的移动地理信息系统的关键技术

介绍了当前主流的移动GIS平台软件和开发工具的背景,以及ESRI公司用于开发移动GIS的工具ArcGIS Mobile,然后阐述了用ArcGIS Mobile开发移动GIS的关键技术,最后用ArcGISMo—bile开发了一个校园移动地理信息系统。     

基于建筑信息模型(BIM)的城市轨道交通设施设备分类与编码研究

城市轨道交通涉及多专业的设施设备,建设项目从设计、施工到运营维护,各阶段的设施设备信息采用不同的分类编码体系,难以开展设施设备的统一化管理。调研上海轨道交通既有的设施设备分类编码体系,基于建筑信息模型(BIM)技术研究,建立城市轨道交通全生命周期的设施设备分类编码体系。该分类编码体系是以城市轨道交通资产管理的分类编码为基础进行编制的,划分了21类,具有唯一性、稳定性、可扩展性等特点,可兼容既有的设施设备分类编码体系,并能够满足城市轨道交通运营维护管理的需求。