GSM-R无线网络切换的关键指标研究

根据GSM-R无线网络切换的特点,对切换的几个关键技术指标进行重点分析,提出衡量GSM-R网络切换质量的几个关键指标,为网络优化提供关键参数。     

天津西南环线铁路钢横梁框架墩设计

当前,新建铁路临近市区或车站地段,往往铁路密集、纵横交错,新建线路与既有铁路、公路小角度交叉的情况不可避免;加之临近车站时线路纵断面抬高困难,需严格限制上跨线路的结构建筑高度.钢横梁框架墩的建筑高度较低,而横向跨度相对较大,是此类工点较好的解决方案.本文介绍了钢横梁框架墩的结构特点,分析比较了不同的墩顶固结方式,并总结了设计注意事项.     

大跨度三主桁连续钢桁梁桥受力特性研究

为研究横向构件布置与截面设计对3主桁受力均衡性的影响,以宁波市三官堂大桥主桥160m+465m+160 m=785 m的大跨径钢桁架连续梁桥为例,采用Midas/Civil软件建立钢桁架梁模型,分析比较对称荷载与偏载作用下主桁结构支反力、轴力和位移等静力效应,得出了3主桁连续钢桁梁桥的内力分布特性.     

徐圩新区达标尾水排海工程项目运行管理研究

徐圩新区达标尾水排海工程项目作为连云港石化产业基地重要的基础设施,主要解决石化基地各企业污水处理达标后的最终排放问题.达标尾水排海工程项目的 稳定运行是石化基地的重要保障.为此,结合徐圩新区达标尾水排海工程的基本情况,对相关风险点及存在问题进行梳理,并提出运行管理实施方案来指导项目的 运行.     

基于线谱特征提取的被动声纳目标识技术研究

该文针对被动声纳目标识别,着重研究了线谱特征提取方法,提出了一种自适应遗传BP算法,并用该算法训练神经网络目标分类器。经对上海上实录三类目标噪声分类识别实验结果表明,所设计的被动声纳目标识别系统具有很好的分类效果。     

宝马车系诊断设备及电控发动机的重点组成部件

介绍宝马发动机电控系统诊断信息、车间诊断设备、电控发动机的重点组成部件。     

辛泰线危岩落石整治

针对辛泰线危石、落石实际情况,结合《铁路路基设计规范》等相关规范、规则对产生危石、落石的原因进行分析并提出相应的综合整治措施。     

地铁信号与站台门接口故障分析

分析地铁信号与站台门系统接口故障对运营造成的影响以及地铁新线开通初期设备故障率较高的现状,对站台门状态未反馈及站台门不联动接口故障进行分析,阐述其发生的原因、处理办法。前瞻性地提出地铁新线建设时信号与站台门接口故障隐患防范措施和思路,减少设备故障率,最大限度降低信号与站台门接口故障对运营带来的影响,为新线正常运营奠定基础。     

Fault classification method for the driving safety of electrified vehicles

A fault classification method is proposed which has been applied to an electric vehicle. Potential faults in the different subsystems that can affect the vehicle directional stability were collected in a failure mode and effect analysis. Similar driveline faults were grouped together if they resembled each other with respect to their influence on the vehicle dynamic behaviour. The faults were physically modelled in a simulation environment before they were induced in a detailed vehicle model under normal driving conditions. A special focus was placed on faults in the driveline of electric vehicles employing in-wheel motors of the permanent magnet type. Several failures caused by mechanical and other faults were analysed as well. The fault classification method consists of a controllability ranking developed according to the functional safety standard ISO 26262. The controllability of a fault was determined with three parameters covering the influence of the longitudinal, lateral and yaw motion of the vehicle. The simulation results were analysed and the faults were classified according to their controllability using the proposed method. It was shown that the controllability decreased specifically with increasing lateral acceleration and increasing speed. The results for the electric driveline faults show that this trend cannot be generalised for all the faults, as the controllability deteriorated for some faults during manoeuvres with low lateral acceleration and low speed. The proposed method is generic and can be applied to various other types of road vehicles and faults.     

基于群组行为的大学校园楼梯及通道行人运动特征分析

为探讨不同场景中行人群组运动的微观特征,并比较不同类型群组运动差异,本文通过大学校园内楼梯上及通道内的观测实验,获取行人运动的相关数据,研究了群组大小、社会关系、运动场景和性别对群组运动的影响. 结果表明：大学校园内行人成组比例低于商场周围行人成组比例;群组成员间的交流方式等因素会影响群组构型;由于群组成员越多相互协调就越困难,所以群组规模越大,其速度越小;此外,男性群组速度大于女性群组速度,情侣间频繁的交流也会对其速度产生负面影响;就差异性而言,2 人和3 人群组间的速度差异小于单人和2 人群组间的速度差异;单个行人不同性别间的速度差异大于2 人和3 人群组不同性别间的速度差异;楼梯上单人与群组的速度差异没有通道内明显.