开体式挖泥船液压缸及甲板铰链的设计分析

介绍了开体式挖泥船上开体液压缸及主甲板铰链的设计方法,并以某小型1800m3开体泥驳为例,就船上开体液压缸、主甲板铰链、液压缸铰链的力学原理、受力计算、结构型式及尺寸校核等作详细说明,为开体式挖泥船的设计提供了一定的参考价值及借鉴作用。     

中型沉箱出运、安装方案

人们普遍认为采用半潜驳出运、安装超过2000 t的大型沉箱,采用浮吊船出运、安装低于500 t小沉箱较为适宜,而对500~2000 t之间的中型沉箱采用何种方案出运、安装并未有统一意见。通过广西北海LNG接收站陆域形成工程,从环境、经济、技术方面进行分析比较,提出采用大型浮吊船（起重船）配合平板方驳出运、安装中型沉箱的优越性,并探讨施工措施。     

海上大型铺管船"大力士"轮的改造

海上大型铺管船是海洋工程船的一种,是海洋管道施工的基本设备,集起重、管道铺设于一身的多功能新型船舶。友联船厂在和中海油合作并成功改造了"南海五号"、"南海二号"和"南海六号"平台后,又和美国环球工业公司在海洋工程上取得了良好合作。文章通过对"大力士"轮成功改造的总结,对几个关键过程进行了简要描述。     

四角桅内力计算方法

四角桅作为一种特殊结构的起重桅,其内力是一空间超静定系统,以某实船的四角桅内力计算为例,介绍一种简便实用的计算方法,可作为船舶设计者借鉴。     

Nonlinear hydrodynamic responses of submerged moving payload in vicinity of a crane barge in waves

The wave interaction with a submerged cylindrical payload subjected to constrained motions in presence of a nearby floating crane barge is investigated in the three-dimensional numerical wave tank using a fully nonlinear potential flow model in the time domain. Numerical simulations are carried out to investigate the hydrodynamic features of this submerged payload under pendulum motion in water waves as well as while it moves towards the sea bed at a constant vertical velocity. It is known that the presence of multiple side by side floating bodies in waves can create significant drift motion. In the present study the similar drift motion is observed for the side by side floating barge and submerged payload and it appears that the submerged payload under constrained motions may face a very large mean drift motion of nearly seven times that of the incident wave amplitude in the beam sea upstream condition. Emphasis is also given towards investigating and understanding the influences of natural frequency of the payload and shielding effect due to the presence of the floating barge. It is found that natural frequency coupled with shielding effect generates remarkable low frequency components in payload responses both in the head sea and the beam sea situations. The effect of different cable lengths, wave maker frequencies and downward moving velocities on payload responses under several geometric setups are studied and compared, and interesting features such as increased low frequency movement of the payload near the natural frequency region and existence of considerable low frequency motions even at a greater depth (while the payload is quite below the free surface) are observed.     

利用浮托力弥补打桩船吊装能力的不足

针对混凝土大直径管桩沉桩施工时打桩船吊装能力存在不足的问题进行了分析,提出了利用管桩空腔排水产生的浮托力来弥补的措施。沉桩结果表明,这种方法是切实可行的,对类似工程的沉桩施工具有参考价值。     

开体泥驳总强度的前期研究

本文介绍了自航开体泥驳结构设计的方法，推导了主惯性轴的转角和惯矩计算公式，给出了中剖面结构设计实例，并探讨了三艘开体泥驳的总强度。     

15000t半潜船耐波性分析和短期预报

基于三维势流理论,运用流体动力软件SESAM对某15000t半潜船在零航速时满载状态下的耐波性进行了计算和分析.并结合半潜船实际航行的国内近海航区,对其在典型海况下的耐波性进行短期预报.计算结果表明,此半潜船在横浪下垂荡和横摇较剧烈,各个浪向角下纵摇较接近,首斜浪下易引起甲板上浪.     

关于海洋工程基地专用半潜驳主要设计尺度的探讨

对于某些在条件较差的海洋工程基地内建造的海洋平台项目,需由传统的船坞建造方式改为平地建造方式.结合某工程实例,介绍在计算和选取出运海洋平台的专用半潜驳的主要尺度参数时应注意的问题,为今后类似工程的设计提供参考.     

25000t半潜驳的开发设计

从项目建设的背景、主尺度和线型的优选、船体结构形式、总纵强度和横向强度校核、船体总布置、下潜压载系统以及作业和拖航工况稳性计算等6个方面对25000t半潜驳进行了综合分析和研究,为将来同类型船舶的开发设计提供了宝贵的经验。