The maximum shipping capacity of the Suez Canal

This paper considers the determination of the maximum shipping capacity of the Suez canal. Initially, some assumptions are made in order to calculate the ‘theoretical’ maximum capacity in terms of ‘standard ships’. This last term defines ships which transit the Canal at a given speed and at a given time interval from the vessel ahead and astern.

Data has been collected from the Canal Zone, the analysis of which provides the necessary information regarding speeds of vessels at different sections of the Canal, time gaps between different classes of ship at different nodes of the Canal, and relationships between time widths of convoys and numbers of ships in those convoys at different points of the Canal.

This data has then been used to calculate the maximum capacity of the Canal in terms of ‘real ships’. For that purpose four schemes have been devised, each taking a different mix of categories of ships. A sensitivity analysis has been undertaken in order to investigate the effect of each class of ship on the real maximum shipping capacity of the Canal. The last two schemes take into consideration the effect of the future introduction of supertankers.     

舱内装载风冷式冷藏集装箱的货舱通风量计算

对于舱内装运风冷式冷藏集装箱的通风,本文推荐采用热平衡方法以及冷凝器风扇排风量方法来计算所需要的货爱风量,同时指出了这种类型货舱通风设计中应注意的问题。     

太平洋鬼船是怎样诞生的

人们总是喜欢把一些无法用科学解释或常理推断出的事情与鬼联系到一起。自从海上有了船,人们将年代久远、自行漂浮、上面没有船员等一些暂时无法搞清楚其来龙去脉的船统称为鬼船。由此,鬼船一词的由来,也可以理解为船失踪后又莫名地再现。2012年3月末,在太平洋加拿大水域出现一艘鬼船。4月6日,美国海岸警备队认为这艘鬼船可能影响附     

用国产件代替进口件修复空气压缩机实践

空气压缩机简称空压机,是船舶的重要辅助机械.船舶一般备有2台同型空压机,要求其总排气量应能在1h内充满空气瓶,充气压力为2.5～3.0MPa,贮气量可连续供主机启动12次.空压机若不能正常工作,将直接影响船舶的正常航行,甚至危及船舶安全.所以,空压机修理十分重要.下面笔者就进口空压机的修理实践,谈谈这方面的体会.     

角焊缝角变形产生机制的研究

以T形焊接接头为算例,用有限元数值计算方法研究了六个固有应变分量各自对角焊缝角变形的作用效应,发现导致角变形产生的主要因素是与焊缝平行的平面内垂直于焊缝方向的固有剪切应变分量;将该固有剪切应变分量以均匀和非均匀两种分布形式施加在焊缝区,发现只有非均匀分布的固有剪切应变使焊接接头产生角变形.由此可知:角焊缝角变形产生的主要原因是在焊缝及其附近区域不均匀分布的固有剪切应变分量,而不是板厚方向上非均匀分布的横向固有正应变分量.此结论指出了关于焊接角变形产生机制的传统思维的认识误区,对研究预测角焊缝角变形简化方法具有指导意义.     

AIS识别船舶等同于互见的理论初探

比较AIS的船舶识别与避碰规则中互见的异同，如果AIS对船舶的识别可以认为是互见，还将叙述其对船舶避碰的影响。     

港口码头靠泊能力核查管理工作探讨

码头结构相对固定,是确定码头靠泊能力的内在因素;船舶航经水域的通航条件处于变化之中,是确定码头靠泊能力的外在条件.码头靠泊能力核查,应以码头结构为主,且提升码头等级所提出的限定条件不得超过相关规范的要求及当地水文气象要素的平均值,而不能因核查论证时的某一通航条件限制了码头的靠泊能力.     

船舶气囊下水技术大步走向世界——气囊国际标准ISO14409∶2011介绍

船舶气囊下水技术是由我国首创、具有完全自主知识产权的一项创新技术,目前已在全世界得到推广应用,国际标准ISO 14409∶2011 Ships and marine technology—Ship launching air bags(船舶与海洋技术船舶下水用气囊)的颁布实施,对我国船用气囊的生产发展和产品质量的提高有切实的指导意义,有利于我国船用气囊更好地走向世界。     

Experimental investigation into the effects of air pockets on wave-in-deck loads of offshore structures

In this paper, air entrapment during slamming is an investigation subjected to an experimental method of inquiry, analysed alongside a theoretical approach obtained from previous attempts to address similar matters. The experiment consisted of assembling three different sizes and depths of artificially created pockets underneath the 1:75 deck model of a 76 m × 76 m prototype to encourage air entrapment and study how this entrapped air affects local and global loads. A parametric study is ultimately conducted on the geometry of the pocket, altering area and depth to observe the response to the pressure. Air entrapment effects were observed to reduce the magnitudes of impact pressure inside the pocket while slightly altering the force time histories in x and z-directions. Force magnitudes for global forces are significantly close to the smooth deck results. However, horizontal force data are slightly higher than their corresponding smooth deck due to additional surfaces inside the pocket. In addition, a parametric study of the depth and size of the pocket reveals that pocket depth is the dominant parameter that affects the impact pressure inside a pocket.     

舷外水自然冷却系统的设计计算

为了保证船舶冷却系统的正常工作 ,航行于泥沙流区船舶的主、辅柴油机不能采用一般的闭式和开式冷却系统。主要介绍小浪底库区交通船舷外水自然冷却系统的原理设计 ,根据相似原理计算确定舷外冷却器传热面积的方法 ,并对所设计、使用的系统提出改进建议