混合动力旅游客车整车轻量化设计

介绍一款典型的12m非插电式混合动力旅游客车整车轻量化设计方法,并重点详细论述车身轻量化研发设计的过程。     

A multiobjective model for maximizing fleet availability under the presence of flight and maintenance requirements

Every aircraft, military or civilian, must be grounded for maintenance after it has completed a certain number of flight hours since its last maintenance check. In this paper, we address the problem of deciding which available aircraft should fly and for how long, and which grounded aircraft should perform maintenance operations, in a group of aircraft that comprise a combat unit. The objective is to achieve maximum availability of the unit over the planning horizon. We develop a multiobjective optimization model for this problem, and we illustrate its application and solution on a real life instance drawn from the Hellenic Air Force. We also propose two heuristic approaches for solving large scale instances of the problem. We conclude with a discussion that gives insight into the behavior of the model and of the heuristics, based on the analysis of the results obtained.     

轨道交通综合枢纽规划探讨

结合上海、昆明、深圳等城市的轨道交通综合枢纽工程,对总平面布置、各种交通方式的衔接及客流组织等内容进行了探讨,特别对城市轨道交通车站与铁路站房的衔接进行了讨论,并对福田轨道交通枢纽设计案例进行了分析。     

8米后置客车行驶左右摇晃原因探讨

针对某6820型后置旅行客车行驶过程中出现的车身摇晃现象，设计人员简要地从悬架系统的配置及布置方式对故障产生原因进行了分析与探讨。     

浅谈城市排水规划

城市排水规划是城市建设的重要组成部分,要编制出适应城市近期和远期的发展,符合国家节能减排的原则,能充分发挥排水设施作用,保证城市水环境不受污染的排水规划,需要掌握城市建设发展、城市现状、存在的问题等情况,并提出合理的解决对策。该文介绍了编制城市排水规划应注意的一些要点、雨水和污水规划方案制定的方法、近期改善城市环境的措施,为今后城市排水规划的制定提供了参考意见。     

优化广西铁路建设项目顺序研究

在综合分析国家及区域"十二五"经济社会发展规划、中长期铁路网规划等规划基础上,预测研究年度区域各铁路客货运量、构成及其未来发展趋势;分析各铁路项目的功能定位及其在区域路网中发挥的运输效益;综合考虑经济效益、社会效益及国家宏观经济政策,提出优化广西铁路建设项目顺序和提高运能的方案,达到提前发挥投资效益的目的。     

西宁至成都铁路引入西宁枢纽总图方案研究

通过对西宁铁路枢纽现状及存在问题进行分析,结合在建西宁站改及相关工程项目实施,以及枢纽内曹家堡物流中心、新建编组站研究情况,提出枢纽总图布局构想。按照充分利用既有设施,点线能力协调,列车径路顺畅,客货运设施布局合理及适应城市总体发展规划要求的原则,针对西宁至成都铁路引入西宁铁路枢纽方案,根据接轨点及枢纽编组站设置位置的不同共研究了4种方案,并对方案进行综合经济技术比较,最终推荐采用高速引入海东西站,普速引入平安驿站,新设曹家堡编组站方案。     

Towards comfort-optimal trajectory planning and control

ABSTRACT

This paper describes a method to analyse and evaluate different trajectory planning methods and controller types for usage in automated vehicles. Its application is shown by using a novel trajectory planning approach considering comfort aspects (based on Rapidly Exploring Random Tree (RRT)), two different controllers to follow the planned path (cascade controller and flatness based controller) and a simulation method to obtain resulting lateral vehicle accelerations. The method is used to plan and drive a trajectory through a roundabout. It can be seen that the lateral accelerations of the controller-driven vehicle are in the range of the values used for planning. However, the results of both controllers show differences in lateral deviation and in smoothness of lateral accelerations. The simulation results are then compared to real-world test drives in the same roundabout. The measured lateral accelerations are in the same range as well but show a smoother progression than the two controller models.     

Can Coastal Management Programs Protect and Promote Water-Dependent Uses?

Anecdotal evidence indicates that commercial and recreational water-dependent uses have been under development pressure in recent years, and in some cases have been converted to other uses. The conversion of water-dependent uses, which range from commercial shipyards to recreational marinas, may have many public costs, including the loss of access to public trust waters, the loss of jobs and associated economic activity, and the loss of traditional working waterfronts. This two-part study investigated the role of five coastal management programs in the northeastern United States in managing, monitoring, and protecting water-dependent uses. First, coastal managers in Massachusetts, Rhode Island, Connecticut, New York and New Jersey were interviewed to assess the conversion problem. Second, in collaboration with New York City-based Regional Plan Association, follow-up interviews were conducted with coastal managers and local planners in Connecticut, New York, and New Jersey to gain greater insight into the role of coastal management programs and local governments in managing and promoting water-dependent uses. This article presents select findings from this study and discusses recommendations for improving the capacity of coastal management programs and local governments to manage water-dependent uses for the benefit of the public.     

洛阳铁路枢纽调整规划研究

通过研究洛阳铁路枢纽存在的问题、能力利用现状以及枢纽的运输需求,得出洛阳枢纽能力紧张、不能满足日益增长的客货运量运输需求的结论。结合枢纽自身特点,提出成环发展的规划方案,通过对运输能力计算表明,所提出的规划方案能缓解当前运输能力紧张的局面。