依宝公路施工初步设计方案优化分析

以目前正在施工的依宝（依兰-宝清）工程项目为例,首先介绍项目概况,从施工路线优化、路基优化、路面优化、排水防护优化、互通优化、分离立交优化、通道优化、桥涵优化、交通安全优化9个方面,系统论述在施工图设计阶段的方案优化。     

加强城市交通规划 助力天津生态城市建设

在天津市建设生态城市的过程中,合理的城市交通规划占有重要地位。从建设生态城市角度探讨城市交通规划中在轨道交通、公交系统、停车换乘等方面应采取的规划管理策略,对于城市建设具有参考价值。     

浅议集镇规划与路政管理的关系

随着国民经济快速发展,公路的城镇街道化现象也日益凸显,如何既促进地方经济发展,又保障公路快捷畅通,是摆在我们面前的重要课题,通过对集镇规划与路政管理在现实与法规方面存在的矛盾进行分析,指出这一问题的不良后果,提出解决措施。     

客车油箱托梁加工工艺方案剖析

客车零件加工工艺方案的制定与模具设计是客车零件生产前的两项十分重要的技术准备。如何寻求最佳的加工工艺方案,选择最佳的模具结构,是提高企业经济效益的着眼点,也是企业工艺工作的重点。     

高坡冲隧道冒顶原因分析及处理方案

文章介绍了广西岑罗高速公路第5标段高坡冲隧道的冒顶塌方情况,分析了隧道冒顶的原因,提出了相应的冒顶处理方案,并探讨了方案的实施效果。     

安吉互通式立交施工阶段交通组织方案探讨

文章结合安吉互通式立交改扩建工程实例,介绍了该立交的交通流现状及路网功能,阐述了立交改扩建施工阶段的交通组织基本思路,并提出了具体的交通组织实施方案,为大型互通式立交改扩建施工提供技术参考依据。     

贵港航运枢纽二线船闸工程总体设计方案探究

文章基于贵港航运枢纽二线船闸的建设规模及工程特点,提出了合理的船闸工程总体设计方案,并详细阐述了方案的设计原则、平面布置及施工组织情况,为今后类似航运枢纽复线船闸工程设计提供借鉴。     

A heuristic for the train pathing and timetabling problem

In a railroad system, train pathing is concerned with the assignment of trains to links and tracks, and train timetabling allocates time slots to trains. These important tasks were traditionally done manually, but there is an increasing move toward automated software based on mathematical models and algorithms. Most published models in the literature either focus on train timetabling only, or are too complicated to solve when facing large instances. In this paper, we present an optimization heuristic that includes both train pathing and train timetabling, and has the ability to solve real-sized instances. This heuristic allows the operation time of trains to depend on the assigned track, and also lets the minimum headway between the trains to depend on the trains’ relative status. It generates an initial solution with a simple rule, and then uses a four-step process to derive the solution iteratively. Each iteration starts by altering the order the trains travel between stations, then it assigns the services to the tracks in the stations with a binary integer program, determines the order they pass through the stations with a linear program, and uses another linear program to produce a timetable. After these four steps, the heuristic accepts or rejects the new solution according to a Threshold Accepting rule. By decomposing the original complex problem into four parts, and by attacking each part with simpler neighborhood-search processes or mathematical programs, the heuristic is able to solve realistic instances. When tested with two real-world examples, one from a 159.3 km, 29-station railroad that offers 44 daily services, and another from a 345 km, eight-station high-speed rail with 128 services, the heuristic obtained timetables that are at least as good as real schedules.     

CTCS-2级列控系统反向运行的相关问题探讨

研究了CTCS-2级列控系统反向运行的相关规范及修订过程,分析了信号系统动态检测中发现的反向运行相关问题,并提出了解决方案,可为线路信号系统的设计提供参考。     

对论文"车桥(轨)耦合振动系统仿真中的基本问题、解决办法及其应用范围"的回复

对"车桥(轨)耦合振动系统仿真中的基本问题、解决办法及其应用范围"一文所提出的问题,进行了回复。根据文章"车桥及车轨时变系统横向振动计算中的根本问题与列车脱轨能量随机分析理论"中分析方法的主要内容,重新阐述了由作者提出的理论、计算模型等的正确性。经多例实测结果验证,未发现与实际情况有较大差距。根据提出的列车脱轨能量随机分析理论,算出5个货物列车—轨道时变系统振动实例,3个脱轨,2个不脱轨,均与实际吻合。