Dynamic stress analysis of the leg joints of self-elevating platform     

黄曌宇  唐文勇  汪怡  王文涛 《中国海洋工程》2011,25(2):319-326

Since a self-elevating platform often works in water for a long time,the lattice leg is largely influenced by wave and current.The amplitude of leg joint stresses is a very important factor for the fatigue life of the platform.However,there are not many researches having been done on the mechanism and dynamic stress analysis of these leg joints.This paper focuses on the dynamic stress analysis and suppression methods of the leg joints of self-elevating platforms.Firstly,the dynamic stresses of the lattice leg joints are analyzed for a self-elevating platform by use of the 5th-order Stokes wave theory.Secondly,the axial and bending stresses are studied due to their large contributions to total stresses.And then,different joint types are considered and the leg-hull interface stiffness is analyzed for the improvement of the joint dynamic stress amplitude.Finally,some useful conclusions are drawn for the optimization design of the self-elevating platform.  相似文献   

海上自升式工程地质勘察平台的设计与应用          下载免费PDF全文

宋宝杰 《探矿工程》2020,47(7):36-40

漂浮式工作平台受天气、波浪、潮汐等自然因素的影响较大，需根据天气窗口期进行作业施工，对工期紧、需较长作业周期、技术要求高的项目并不适用。本文设计的自升式工程地质勘察平台，既具备了浮式工作平台、改装驳船等施工平台的优点，又因其具备自升功能，施工期间甲板离开海平面可以最大程度避免气象、环境因素的影响，有效延长施工窗口期，提高工作效率，同时稳定的海上作业平台，极大地提高了数据参数获取的准确度。  相似文献   

自升式连体潜标测量系统的设计与实施   总被引：1，自引：1，他引：0  

徐如彦  沈宁  倪佐涛  李强  李家刚  黄必桂  雷方辉  张振波  朱友生  吴海京  陈志平  陈强 《海洋科学》2014,38(12):94-98

针对有缆潜标系统测量质量不稳定,缆绳阻力大、浮球浮力不足,测量系统难以绷紧,导致潜标摇摆、缆绳倾斜,受海洋环境的其他外力作用,影响采集资料的质量等问题,设计了自升式连体潜标测量系统。该系统最大特点是把各种仪器设备与释放器搭载组合到同一平行面的潜标内,把仪器设备、释放器与浮体材料合成为单位体积最小的潜标测量平台。该系统还有体积小、质量轻、造价低、操作简便等特点,适用于水深1 200 m内的海区,采用座底方式进行测量。系统通过释放装置脱钩,脱钩后连体潜标可自行升浮到海面,并具有隐蔽性好不易被破坏的优点。经过近1 a的试验,已多次在南海水深400 m多的海区顺利完成了海上投放与回收试验,试验结果良好。  相似文献