京唐港航道扩建工程方案对比研究

依据京唐港的自然状况 ,航道和挡沙堤的现状 ,确定研究方法 ,对 3 .5万t级航道进行潮流数学模拟 ,并对泥沙淤积进行分析 ,对航道进行选线、导标布置。最后确定挡沙堤的合理布局     

集装箱船抗横倾系统及其“0”位检验

本文简略介绍了抗横倾系统的功能,对其系统组成和工作原理进行详尽的说明,并介绍我厂对抗横倾‘0’位的检验方法。     

Modelling propeller and rudder induced forces acting on deep drafted vessels in muddy navigation areas

To assess the navigability of deep drafted vessels in muddy navigation areas a mathematical model has been built that takes into account the characteristics of the mud layer. This was achieved with the introduction of a fluidization parameter which determines the corresponding hydrodynamically equivalent depth above a solid bottom. As a result, the under keel clearance dependency of a given mathematical manoeuvring model can be reformulated in such way that the effect of any realistic muddy condition is included. In this article the modelling of the propeller and rudder induced forces and the implementation possibilities of the model will be discussed. It is concluded that the mathematical model, initially formulated for a 6,000 TEU container carrier, provides reliable predictions of the behaviour of larger container carriers and even fuller deep drafted ships.     

平衡含沙量、平衡水深与海床冲淤计算

利用平衡含沙量原理，通过水槽试验得出悬扬型和沉降型两种平衡含沙量及相应表达式，进一步利用平衡水深概念，导出海床冲淤计算公式，利用该公式计算了上海国际航运中心洋山港区的海床冲淤变化，计算结果与物理模型试验结果一致，验证了该公式的合理性，可以应用于实际工程中。     

基于EDI的集装箱运价指数生成与技术分析

为克服目前集装箱运价指数计算中所存在的抽样信息不全面和干扰信息过多等缺陷,通过采用港航电子数据交换(EDI)源信息来生成集装箱运价指数,并展开相应的技术分析。研究表明:这一途径是可行的。     

Modelling cyclic container freight index using system dynamics

ABSTRACT

This paper investigates the cyclical nature of container shipping market represented by a containerized freight index and proposes a predictive cyclical model of the market. In contrast to the traditional spectral analysis (univariate), system dynamics reflect the drivers of the market in both supply and demand side, and therefore, it is a multi-variate system equilibrium approach consisting of various causal spillovers from sub-components of the market. This study is the first to analyze the cycle of container market using system dynamics. By utilizing system dynamics cyclicality approach, one-step ahead predictions are generated for monthly containerized freight index and compared to conventional benchmarks for post-sample validation. Our study can also help policymakers and shipping liners for better management and invest timing of container ship.     

Does a carbon tax affect the feasibility of Arctic shipping?

The Arctic route has huge potential for shipping between Europe and Northeast Asia with significant savings in transit time and distance. However, GHG emissions from shipping would harm the environment of Arctic area. Potential Market Based Measures of GHG emission reduction (such as carbon tax) are under consideration but they may affect the economic viability of Northern Sea Route (NSR) for containerships. This paper investigates the economic viability of NSR against Suez Canal Route (SCR) under 2 proposed carbon tax schemes (fixed vs. progressive). Three different fuel oil types (Heavy Fuel Oil, Light Fuel Oil, Liquified Natural Gas) are used as main bunker fuel for the calculation of economic feasibility. Our result reveals that when there is no carbon tax on NSR nor SCR, or both routes are under a carbon tax scheme, no matter fixed or progressive, NSR is more economically viable, regardless of fuel type choice. When only NSR is under a carbon tax scheme, the viability depends on specific carbon tax scheme and fuel choice, but for the majority of containership sizes, NSR has lower unit cost. The result also suggests that for a given route, a progressive scheme in preferable than a fixed one and LNG would be an appealing fuel with lower unit cost.     

The container retrieval problem with respect to relocation

The demand for container terminal yards is growing significantly faster than the supply of available land; therefore, containers are typically stacked high to better utilize the land space in container yards. However, in the process of container retrieval, non-productive reshuffling may be required to relocate the containers that are stacked on top of the target container. Container retrieval is directly related to the operational efficiency of terminals. Because the industry has become increasingly competitive, it has become critical to introduce a systematic approach to retrieving containers. In this study, we develop a heuristic that can generate feasible working plans for rail-mounted gantry cranes (RMGC) in container yards to minimize the number of container movements while taking the RMGC working time into consideration. The methodology takes into consideration the case that containers are grouped in terms of their retrieval order. Multi-lift RMGC models also are studied. Comprehensive numerical experiments reveal that the method runs faster than other methods published in the literature by several orders of magnitude; additionally, our method is able to solve instances larger than practical use. The number of movements approaches a theoretical lower bound, and the numerical results clearly demonstrate the tradeoff between the number of movements and the working time, and provide useful insights for yard planning.     

Locating dry ports on a network: a case study on Tianjin Port

A mathematical model for optimizing the location of dry ports is developed. The objective is to minimize the sum of the transportation costs and the fixed facility opening/closing costs. Unlike previous research on this subject, the possibility of closing existing dry ports is investigated. The dry port location problem is formulated as an integer programming and it is shown that the CFLP is a special case of our problem. The proposed model is then applied to the port of Tianjin in China and the sensitivity analysis is performed to demonstrate the robustness of the model. Our model suggests that while Tianjin Port should open some new dry ports, it might be better off closing those existing dry ports without enough throughputs. Although all parameters estimated should be uncertain in reality, sensitivity analysis shows that the results returned by the model are quite stable.     

1700TEU集装箱船甲板舱口角隅疲劳强度评估

在消化吸收德国劳氏船级社（GL）规范的基础上，对沪东造船厂建造的1700TEU集装箱船大开口甲板舱口角隅进行了疲劳强度分析和评估，并讨论了主要参数对采用简化疲劳强度评估方法所得到的评估结果的影响。计算结果表明，该方法对集装箱船大开口甲板舱口角隅处的结构设计具有一定的实用意义和参考价值。