Ship assignment with hub and spoke constraints

As the shipping industry enters the future, an increasing number of technological developments are being introduced into this market. This has led to a significant change in business operations, such as the innovative design of hub and spoke systems, resulting in cargo consolidation and a better use of the ship's capacity. In the light of this new scenario, the authors present a successful application of integer linear programming to support the decision-making process of assigning ships to previously defined voyages — the rosters. The tool used to build the final models was the MS-Excel Solver (Microsoft® Excel 97 SR-2, 1997), a package that enabled the real case studies addressed to be solved. The results of the experiment prompted the authors to favour the assignment of very small fleets, as opposed to the existing high number of ships employed in such real trades,     

基于图像处理的桥墩防撞预警系统的研究

利用图像处理硬件设备，通过摄像头将视频信息采入，送入DSP进行分析处理；专门视频信息处理软件，运用各种图像处理技术，进行实时处理分析，对船舶进行实时监控。当船舶进入预警区，经计算机判断处理，提醒监控人员并通过广播对船舶驾驶人员发出警告，避免事故发生。 在图像序列处理技术的开发中，采用软硬件分离的方法，先进行基于Visual C＋＋的计算机软件设计研究；在软件中，研究了船舶检测、船舶跟踪与计算等内容。     

一种基于模糊原理的碰撞危险度模型

基于“领域”概念和模糊原理，建立起一个用于确定船舶间碰撞危险度的数学模型。该模型不仅综合考虑了多种因素对碰撞危险度的影响，而且简便易行。通过模拟试验表明：本模型能够很好地反映出实际情况，具有较好的效果。     

转身,驶向新航程

世事变迁，历史更迭，这是谁都无法改变的自然法则。在此法则下，无论你昔日有多荣光，但终有黯然离场的那一天。如果说2008年的海事界让我们见证了航运高潮，那么2009年则让我们感受了亢奋消退后的苍凉。     

A proposed simulation-based operational policy for cruise ships in the port of Kotor

This paper investigates the simulation modelling of cruise ship traffic in the Boka Kotorska Bay (BKB), which has become a very attractive cruise destination due to its geographic location, port features and attractiveness for tourism. The purpose of this paper is to examine the development of new port infrastructure, because of the increased cruise ship arrivals in recent years. The paper describes in detail the layout of the port of Kotor and the possibilities for quay extensions. The solution to minimize the number of ships at anchorage instead of being at berth is given, because the passengers of the latter ships have a more convenient approach towards the port. The simulation model is verified and the simulation results are validated against the real data prior to an investigation of the possible scenario for quay extension. The proposed solution confirms the preliminary survey results that initiated the investigation of possibilities to improve the port infrastructure. Moreover, simulation results point towards a significant improvement of cruise ships throughput in the BKB. The proposed operational policies and statistical analysis, as well as a comprehensive model analysis of the BKB provided here, are a good foundation for future investigations.     

IMO第二代完整稳性衡准对现有万箱船设计的影响

国际海事组织（IMO）正在制定基于水动力学的第二代完整稳性衡准,新衡准的实施必然对现有船舶的设计带来巨大影响。集装箱船大型化是航运界的发展趋势,万箱船船型订单近年也大幅上升。已有的事故发现大型集装箱船对参数横摇、过度加速度等衡准相对敏感,但现有船舶的设计对此类事故模式考虑较少,因此有必要开展相关研究。本文选取了某万箱集装箱船,对其大量装载工况进行四种稳性失效模式的计算分析,研究了第二代完整稳性的实施对大型集装箱船的稳性影响,并对其装载、设计等提出一定的建议。     

Optimal portfolio choice for ship leasing investments

ABSTRACT

We develop an advanced portfolio analysis method to determine the optimal ship mix for a portfolio. A typical business model of a ship leasing firm is to acquire ships for charter income. However, transportation assets (such as ships and aircraft) are different from financial assets (e.g. stocks and bonds) as they are tangible and have a limited useful life. Thus, methodologies for financial portfolios cannot be simply extended to portfolios of transportation assets. Recently, ship leasing represents a non-traditional source of ship finance. A ship leasing firm can manage a certain number of ships across different ship types. Based on portfolio theory and industry-related evidence, we construct an optimal ship portfolio consisting of a manageable combination of carefully chosen ships. The expected return of the asset combination is examined with respect to various ship types and sizes. We quantify the freight risk for different categories of ships in different sectors to investigate the characteristics of ship portfolios. The estimation of such freight risk is of considerable interest to academics and practitioners alike, because determining the behaviour of freight risk has important implications for investment decisions regarding ships. Our portfolio method should strongly support the decision-making process involved in leasing ships.     

船岸一体化管理平台设计

船岸一体化管理平台建设采用了全新的船舶管理理念,充分利用现代通信、信息、数据处理技术,与先进的船舶管理模式相结合,以船舶实时运行数据为基础,成为船岸安全与技术管理的决策依据。     

斜架车加长改造的技术分析

主要讨论把原设计用于沉箱溜放的斜架车加长改造，用于大型工程船舶拉排修理。根据斜架车在大型工程船舶修理中的实际应用，提出斜架车改造方案，说明了设计和制作过程，并结合实例论述了斜架车拉排作业流程。     

全封闭型护卫舰空调通风系统及其隔振降噪设计

论述了全封闭型舰艇空调通风系统通常的主要特点及适宜采用的相应设计，概述了空调通风系统减振噪的研究设计和综合治理，并以某舰为例列述了各项设计的实船效果。     

船舶在复杂海况下的实时运动仿真

给出一种工程实用的仿真方法，能实时地提供船舶在复杂海况下的动态响应数据，利用该方法所建立的运动仿真系统为研究和开发海洋工程动力定位技术提供了较好的调试环境，文中对两个不同算例的数值仿真结果，表明该方法对工程应用是可行的。     

大型巴拿马和超巴拿马集装箱船的主尺度估算方法

分析讨论了目前国内外对大型集装箱船主尺度的估算方法,以３０００ＴＥＵ以上的大型巴拿马集装箱船为目标,引入并改进Ｔｉｔｏｖ法作为一种基本估算方法,并分别对３０艘３０００ＴＥＵ以上的巴拿马和２０艘超巴拿马集装箱船的主尺度进行统计分析,得到了各自对应的回归公式,同时给出了算例及分析。     

Prediction of capsizing probability for a ship with trapped water on deck

The authors have already examined a method for evaluating the capsizing probability of a ship in the dead ship condition based on a piecewise linear approximation of the restoring arm. Here, this method is extended to ships with trapped water on deck. This is because the stability of ships having a relatively high bulwark, such as fishing vessels, could substantially deteriorate due to trapped water on deck. First, the mean amount of water trapped on deck was estimated as a function of the significant wave height and the mean wave period using a model experiment in irregular beam seas. Second, the restoring arm curve with trapped water on deck was calculated hydrostatically and then approximated with a piecewise linear curve. Third, the roll angle was estimated using a nonlinear and uncoupled equation of absolute roll angle under stochastic wave and wind exciting moments. The short-term and long-term capsizing probabilities were calculated for a fishing vessel operating off Kyushu. Numerical results quantitatively demonstrated that the effect on capsizing probability of trapped water on deck cannot be ignored when accurately evaluating the stability of fishing vessels.     

三峡库区架空直立墩式码头靠泊能力评估研究

三峡库区正常蓄水后,库区航运条件得到极大改善。由于码头存在靠泊超设计船型船舶的情况,因此,对库区现有码头进行靠泊能力评估是十分必要的。本研究通过分析和研究架空直立墩式码头的靠泊能力,提出结合原有设计和码头实际运行情况,并通过有限元计算分析超设计船型靠泊时码头结构实际响应的综合评估方法。该方法可为类似码头靠泊能力评估提供参考。     

应重视军民通用型舰船开发及应用技术研究

从和平时期军用舰船的有效利用和战时舰船的大量消耗，以及如何降低舰船的建造费用、如何减少舰船现代化改装时的难度和费用及民用船只的征用等多方面论述了开展“军民通用型舰船开发及应用技术研究”的重要意义，并针对军民通用型舰船研究提出了建议和看法。     

实际海浪环境中舰船大尺度模型试验研究进展

目前对舰船总体性能的研究主要是依靠数值计算、水池模型试验、实际海浪环境大尺度模型试验以及实船海试等方法,以上各种方法均有一定的适用范围.实际海浪环境中舰船大尺度模型试验技术是采用适当缩尺比的自航船模在自然水域环境中进行的试验,可以研究舰船在开阔海域自由航行状态下的各项航行性能.分析各种舰船总体性能研究方法的优缺点,针对目前舰船总体性能理论与试验研究存在的问题分析开展舰船大尺度模型海上试验研究的必要性,综述国内外大尺度模型试验技术的发展现状,最后针对该试验技术中的关键技术及热点问题进行总结与展望.     

宁波船舶交通管理中心在台风期间的安全监管

考虑到宁波-舟山港每年都会受到台风影响,且台风来临时给在航船舶、锚泊船舶和靠泊船舶带来重大安全隐患,根据宁波船舶交通管理中心辖区的具体情况,结合自身监管经验,分析目前宁波防抗台监管措施中存在的问题,并提出了相应的对策和建议。     

船舶脱硫系统安装工艺

为适应大量船舶进行脱硫改造的需求,介绍脱硫系统的构成与形式和脱硫原理与脱硫系统配置要求,论述脱硫设备安装、脱硫管系泵压试验和脱硫系统调试等脱硫系统安装工艺。经实船验证,脱硫系统安装工艺对其他船舶的同类施工具有借鉴和推广价值。     

中水系统在船舶上的应用

介绍船舶中水回用的优势和船舶中水处理技术,并以实船应用为例,着重介绍了典型的中水回用系统.对中水系统在船舶上的应用提出了不同的应用方案.     

乌江航道千吨级船舶K、T指数计算方法

为得到乌江航道千吨级标准船型的K、T指数计算经验公式,基于乌江航道和乌江千吨级船舶特点,提出适应于该船型的船舶操纵运动数学模型研讨小组(Ship Maneuvering Mathematical Model Group,MMG)模型,利用船模试验资料验证模型的准确性.利用该模型对一系列千吨级船舶进行模拟仿真,得到Z形操...