开敞式码头面高程的确定

结合设计工作实践,就不同结构型式下开敞式码头面高程的确定方法进行探讨。     

Sequencing twin automated stacking cranes in a block at automated container terminal

In the considered automated container terminal (ACT) that is designed for Shanghai Yangsha Terminal, two automated stacking cranes (ASCs) are configured for each block and they interact with automated lifting vehicles (ALVs) at the two ends of a block individually. To increase the capacity, container yards with multiple rows of blocks perpendicular to the terminal’s shoreline are considered. To utilize the yard spaces, the twin ASCs are devised to share the same tracks installed at the two sides of a block, while interferences between the ASCs challenge the routing and sequencing operations. To isolate the control and simplify the coordination of the two ASCs, the interference between ASCs is formulated by analyzing the minimal temporal intervals between any two tasks. Three models are then established to sequence the container handling tasks under the minimization of the makespan. An exact algorithm and a genetic algorithm are designed to solve the problem. Numerical experiments show that the algorithms are competitive comparing to on-the-shelf solvers. Practical implications are investigated based on the formulations and experimental results. The managerial implications and technological aspects of applying the formulations and algorithms to practical situations to real-world ACTs are discussed.     

Strategic trade-off between vessel delay and schedule recovery: an empirical analysis of container liner shipping

In this paper, we empirically test the relationship between the delay of containerships and the scheduled operations in a terminal, based on a dataset containing information on 352 containership arrivals during a 9-month period at seven terminals of three North American ports. We find that a vessel is less likely to be delayed when there are more operations scheduled shortly (up to 3 days) after the vessel’s berthing window in the terminal. Moreover, we also find that the more containers a vessel needs to unload in the terminal, the less likely that it would be delayed. Both findings support the hypothesis that liners strategically balance the trade-off between delay cost and schedule recovery cost.     

万吨级以下油码头登船梯结构设计

现有的大中型登船梯的设计不适合于万吨级以下油码头 ,在分析了现有的中型或大型登船梯结构和 10 0 0吨级至 10 0 0 0吨级油码头登船梯的设计条件后 ,提出了一种改进中型或大型登船梯结构的设计方案 ,并将此方案应用于大连港新港扩建码头 ,获得成功。此种设计方案增加了登船梯的使用范围     

文丘里型末端变风量阀弹簧设计探讨

文章提出了当量直径概念,根据量纲分析理论对绕圆球充动的绕流阻力公式进行了修改,从而得出文丘里型末端变风量瘩中阀芯绕流阻力与其所处位置的关系,在理论上提出了设计主等节距弹簧的方案,这对建立数学模型进行数值计算有着启发性的意义。     

赣深客运专线引入深圳枢纽方案研究

赣深客运专线是京港高速铁路的重要组成部分,通过对深圳枢纽既有客运布局、客运量及客流分析,结合深圳市发展规划,研究深圳枢纽第三主要客站选址问题,提出赣深客运专线引入深圳枢纽的西线、中线和东线方案,通过技术经济比较推荐赣深客运专线西线引入深圳枢纽方案,推荐方案布局合理,吸引客流范围大,符合城市规划,将极大带动沿线经济和深圳市前海中心的发展。     

重庆市主城区轨道交通现状分析

基于重庆市主城区轨道交通现状线网运营指标等数据,对主城区轨道交通存在的问题、产生的原因进行分析,并提出了相应的建议,期望为解决重庆市主城区轨道交通存在的主要问题提供参考。     

重庆轨道交通单轨系统弓网配合的研究及改造

重庆轨道交通2号线跨座式单轨交通系统在弓网配合方面出现集电器滑块磨耗不均匀问题,分析其形成的原因,提出接触网拉出值改造方法,并讨论改造后的效果。     

区域轨道交通与城市轨道交通衔接模式

简要阐述区域轨道交通和城市轨道交通的基本概念,在分析区域轨道交通和城市轨道交通技术特征的基础上,提出都市圈的区域城市铁路发展模式,以及区域轨道交通与城市轨道交通的衔接模式.以重庆1h经济圈的轨道交通布局为例,探讨1 h经济圈城市铁路与城市轨道交通的衔接方案.     

重庆主城区现状轨道交通问题分析与建议

从客流量、客流分布、车站客流、运行效率、换乘情况等几个方面,分析重庆市主城区轨道交通存在的五大问题:总体客流效果相对较差、客流量空间分布不均衡、部分核心区段线路相对拥挤、重点车站换乘压力较大、运营效率不高。从城市空间结构拓展,轨道车站与人口、用地的契合关系,车站覆盖率,站间距等方面找出存在问题的原因,如城市拓展需要时间、轨道功能层次尤其是快线缺乏等,从进一步加密中心区线网密度、规划轨道快线、做好车站的规划建设等方面提出后期优化完善建议。