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1998年12月13日武汉交通科技大学船舶及海洋工程系邀请海军工程学院董祖舜教授来校作"高速船研究与发展趋势"学术报告.董教授是武汉造船工程学会船舶力学委员会副主任委员、中国造船工程学会船舶力学委员会高速船学组组长,对国内外高速船的发展有很深的研究.他向与会的30余名教师和研究生介绍了高速船的发展历史、各类高速船的特点,重点介绍了高速双体船与多体船及我国高速船的研究情况,评述了高速船发展的趋势. 相似文献
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在国民经济迅速发展的今天,高速船成为造船界的热门话题,人们已经意识到进一步开发和发展高速船是客观实际的需要,是船型发展的必然规律。编者从1993年5月召开的“武汉地区高速船可行性讨会”上征得数篇有关发展高速船的论文并已在本刊陆续登载。本文分析了了我国水上客运的发展况。我全面地介绍了我国速客船的引进和发展情况,对高速客船的发展有一定的指导意义。 相似文献
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本文根据20,000t级江海直达散货船的应用范围,选取营运三条航线的三艘船舶作为比较对象进行研究,通过计算不同船型在不同航线营运的必要运费率将直达船型与其他船舶进行比较,直观地体现了各船型在不同航线运营时的经济效益。并通过对必要运费率的计算结果进行敏感性分析来寻找对20,000t级江海直达船型来说较敏感的市场因素,并确认与不同船型比较时对其有利的市场波动情况。论文的研究成果可为20,000t级江海直达船型投入市场后的经营方式提供参考,为有意于投入江海运输事业的各界人士提供决策参考。 相似文献
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分析总结前4年世界高速船市场的情况,对后6年的情况作预测,并且从船型,适航性,航速造、造价诸方面结合当前中国国情提出了看法,明确指出我国高速船设计生产企业应走产研相结合的道路,共同发展高速船产业和水上高速客运。 相似文献
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针对我国沿海内贸集装箱运输市场的特点以及沿海内贸集装箱运输港、线、船、货的现状,充分考虑影响我国沿海内贸集装箱运输市场和船型选择的因素,建立沿海内贸集装箱运输最佳船型的选择模型,运用非线性规划的方法,以单箱最大利润为目标函数,求得最佳船型。以天津——广州(南沙)航线为例对模型进行验证,得出我国沿海内贸集装箱运输的最佳船型为载箱量6000TEU及船速22kn的结论。 相似文献
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The creation of geometric model of a ship to determine the characteristics of hydrostatic and hydrodynamic, and also for structural design and equipments arrangement are so important in the ship design process. Planning tunnel high speed craft is one of the crafts in which, achievement to their top speed is more important. These crafts with the use of tunnel have the aero-hydrodynamics properties to diminish the resistance, good sea-keeping behavior, reduce slamming and avoid porpoising. Because of the existence of the tunnel, the hull form generation of these crafts is more complex and difficult. In this paper, it has attempted to provide a method based on geometry creation guidelines and with an entry of the least control and hull form adjustment parameters, to generate automatically the hull form of planning tunnel craft. At first, the equations of mathematical model are described and subsequent, three different models generated based on present method are compared and analyzed. Obviously, the generated model has more application in the early stages of design. 相似文献
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深V型艇与传统圆舭型小艇相比,在耐波性能上有较大改善。文章通过8.5 m小艇模型试验和实艇耐波性试验,系统研究了艇型V度对阻力的影响和横剖面形状对耐波性的影响,研究结果显示:对于载荷较重和航速较低的排水型船,若采用极深V型艇,可以同时获得更好的推进性能和耐波性。 相似文献
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沿海内贸集装箱班轮航线优化研究 总被引:1,自引:0,他引:1
随着沿海内贸集装箱运输市场的快速发展,各大班轮公司如何把船舶安排到最佳航线上,使有限的船舶资源创造最大的经济利益,成为各大公司研究的课题。根据沿海几大干线港口之间的运量需求,建立非线性规划与整数规划相结合的混合模型,选择典型航线建立运输网络,并对其进行优化。该数学模型可应用于解决我国沿海内贸集装箱船舶运输航线配置问题,进而实现利润最大。 相似文献
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集装箱船舶大型化对中国班轮运输的影响 总被引:1,自引:0,他引:1
通过竞争情报分析提供了各班轮公司未来船队结构和运力的变化趋势,由此观察到各班轮公司为了降低自身的营运成本,在最近几年大量订购超巴拿马型甚至更大型的集装箱船舶参与运输,但是却不能达到其预期的规模效应。原因就在于相当一部分成本随着船型的增大而线性增加,规模不经济。我们探讨了中国的班轮运输市场的几个重要特点:中外贸易的不平衡导致了货源的不平衡;未来贸易结构的调整会影响航线的布局和调派;贸易上的不稳定因素使班轮公司遇到外在的风险。这些特点会深远地影响集装箱船舶大型化的经济受益,相反的,集装箱船舶大型化的趋势也会加剧这些负面的影响,危及整个班轮运输市场。 相似文献
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This paper presents a study on the numerical simulation of planing crafts sailing in regular waves. This allows an accurate estimate of the seas keeping performance of the high speed craft. The simulation set in six-degree of freedom motions is based on the Reynolds averaged Navier Stokes equations volume of fluid (RANSE VOF) solver. The trimming mesh technique and integral dynamic mesh method are used to guarantee the good accuracy of the hydrodynamic force and high efficiency of the numerical simulation. Incident head waves, oblique waves and beam waves are generated in the simulation with three different velocities (Fn =1.0, 1.5, 2.0). The motions and sea keeping performance of the planing craft with waves coming from different directions are indicated in the flow solver. The ship designer placed an emphasis on the effects of waves on sailing amplitude and pressure distribution of planing craft in the configuration of building high speed crafts. 相似文献
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Lauri Ojala 《Maritime Policy and Management》1994,21(4):273-294
The purpose of the article is to analyse the operation of shipping companies in Finland, Sweden and Norway cross-sectionwise in 1989-1991. These represent three different types of shipping operations in three neighbouring countries in Northern Europe. In the analysis, an apllication of the transaction cosr approach (TCA) is employed. It is shown that finnish shipping is usually very concentrated both in terms of geographical coverage, cargo composition and ownership. In cargo shipping, Finnish shipping firms mainly operate on the 'domestic' routes connecting Finland to the main European markets. Few Finnish firms are operating in highly competitive operations such as cruise shipping and liquid and dry bulk trades. Ownership in shipping is also often institutionalized rather than being in private, independent hands. In Sweden, the hierarchial governance of shipping is less than it is Finland. In certain worldwide trades, such as reefer and car carrier trades, the governance structure could be defined as hierarchial due to high asset specificity and high degree of specialization. In Norway, the shipping industry seems to be strongly market-oriented. The industry is composed of shipping companies, whose existence depends on their cost competitiveness on the shipping market, and is usually not backed up by exclusive hierarchial arrangements. Notable exceptions are the LNG/LPG and car carrier trades. The classification presented principle can easily be extended to other shipping countries, or companywise comparisions, as well. 相似文献
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介绍金沙江中下游航道与港口现状及发展规划和水电开发利用规划,对金沙江航运经济腹地进行综合交通运输体系分析并对典型路径运输成本进行测算。在调研分析的基础上,对金沙江客货运量和主要港口吞吐量进行预测。结合水电梯级开发对航道条件的影响,分析金沙江航道开发潜能,提出长江干线航道上延至金沙江的合理区段。针对金沙江中下游4个水电枢纽的现场条件,分析适应翻坝运输的货种对象,提出过坝线路选择与运输组织的原则,开展"水-陆-水"翻坝运输方案与"陆-水"公路短途驳运方案的技术经济分析。以期为金沙江攀枝花—水富段航运资源开发论证提供参考。 相似文献
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高速三体船阻力性能研究 总被引:10,自引:1,他引:9
对中体和侧体均为Wigley船型的高速三体船模在Fr=0.1~0.8时3个横向偏距、5个纵向偏距共15个状态进行了阻力试验,将高速三体船线性兴波阻力理论计算结果与模型试验结果进行了比较,并据模型试验结果分析了横向偏距和纵向偏距对兴波阻力系数的影响,其中各状态的形状因子(1 K)按普鲁哈斯卡法确定,对形状因子与偏距的关系也进行了探讨. 相似文献