温福铁路通信信号系统集成简介

介绍了温福客运专线的项目情况,重点阐述该项目的通信信号系统集成技术方案。其中信号系统包括运输调度指挥、列车运行控制和车站联锁等;通信系统则包括传输、电话交换及接入、数据网、专用移动通信和调度通信等。     

浅议地基土承载力上大下小条件下的基础设计

新近沉积地层往往表层有一"硬壳",下卧层软弱,在进行建筑物基础设计时,充分利用上层"硬壳"作为持力层,采用浅埋扩大基础处理,较粉体搅喷桩、预制打入桩等措施能节约大量费用。     

浅谈粉煤灰路堤的设计与施工

介绍了粉煤灰路基在河南省安阳至林州高速公路中的应用。     

锂动力电池组关键参数研究与性能评估

锂离子电池具有诸多优点,已广泛应用于小功率便携式设备上。在大功率方面,聚合物锂离子电池在储能和动力源领域已开始崭露头角。随着聚合物锂动力电池的应用越来越广泛,对锂动力电池组在整个生命周期内的性能进行评估显得尤为重要。本文对锂动力电池组的一些关键参数进行了讨论并对电池组的性能评估方法进行了探讨。     

A GIS‐based method to identify cost‐effective routes for rural deviated fixed route transit

Deviated fixed route transit (DFRT) service connecting rural and urban areas is a growing transportation mode in the USA. Little research has been done to develop frameworks for route design. A methodology to explore the most cost‐effective DFRT route is presented in this paper. The inputs include potential DFRT demand distribution and a road network. A heuristic is used to build possible routes by starting at urban cores and extending in all network directions in certain length increments. All the DFRT routes falling in the length range desired by the users are selected. The cost effectiveness of those routes, defined by operating cost per passenger trip, is compared. The most cost‐effective route is selected and presented in a GIS map. A case study illustrates the methodology in several Tennessee metropolitan regions. The most cost‐effective route length is case specific; some routes (e.g. those out of our Nashville case) are most cost effective when short, while others (e.g. those out of Memphis) are most cost effective when long. Government agencies could use the method to identify routes with the lowest operating cost per passenger given a route length or an operating cost budget. Copyright © 2016 John Wiley & Sons, Ltd.     

Empirical analysis and comparisons about time-allocation patterns across segments based on mode-specific preferences

A three-stage approach, i.e., factor-cluster-multi-group Structural Equation Modeling (SEM), is designed to explore the commonalities and diversities with respect to relationships between socio-demographic characteristics and time-use patterns across different segments. Factor-cluster analysis is conducted to extract meaningful factors from attitudinal statements, and then group the sample population into three segments, each with a unique combination of mode preferences for public transit, private car, and motorcycle. By virtue of multi-group SEM, the relationships between socio-demographics and time allocated to activities and travel are found to be significantly different across segments. This study highlights the importance of latent psychological factors in segmentation. For policy implication, specific population with unique psychological features must be targeted in order to efficiently and effectively design and implement transport measures.     

主动控制式限滑差速器结构分析及其性能评价

对电液式、电磁式和电机式主动控制限滑差速器结构特点和工作原理进行了分析,提出以内摩擦转矩(限滑转矩)、锁紧系数、转矩比、差速器效率、差速器传动效率等性能参数来综合评价主动控制式限滑差速器的性能.推荐采用限滑转矩与左、右半轴转速差关系曲线来表征基本限滑性能;采用锁紧系数和转矩比时间历程曲线来表征动态限滑性能;采用锁紧系数、转矩比分布直方图对限滑性能进行统计分析.     

基于虚拟设计的发动机工作过程研究

提出了流场静态模拟、气道稳流试验、流场及燃烧的三维动态模拟相结合的工作过程虚拟设计方法,并对车用4气门汽油机进行了详细的模拟研究.通过流场静态模拟与气道稳流试验相结合,使两者的结果相互补充,并对选用的湍流模型进行验证;将流场三维动态模拟的结果作为初场应用于燃烧三维动态模拟,使燃烧模拟更接近于实际工作状态.静态与动态模拟的较好结合既能大量节省计算时间,又提高了模拟的真实性,有效缩短产品开发与改进的周期.     

混凝土轨枕裂损与养护作业

介绍了混凝土轨枕伤损的类型及其原因,并推出了一种适合混凝土轨枕线路特点的养护作业方法。