【作者】 张波；

【导师】 祁恩荣； 尹群；

【作者基本信息】 江苏科技大学 ， 船舶与海洋结构物设计制造， 2013， 硕士

【摘要】 地球上海洋的面积超过70%以上。随着地球人口的爆发式增长和工业的发展，需要消耗大量的资源和开发空间，地球陆地上的所有资源和空间已基本被开发并消耗殆尽，人类急需要依靠开发海洋来满足人类对空间和资源的需求。对海洋油气资源、海洋空间和海底矿产的开发将成为日后世界各国竞争的焦点。日本对海洋空间的开发研究处于世界前列，已经建造了海上浮式石油储备基地并对海上机场进行了海上实验研究。目前在开发海洋空间领域的研究方面，超大型浮式结构物的研究是海洋工程界的热点之一。超大型浮式结构物可以用作海上城市、海上机场、浮式港口、军用海上移动基地等[1]。相信在不久的将来超大型浮式结构物将不再是设想。海上移动基地（MobileOffshoreBase，MOB）是一座由一系列半潜式模块组成的超大型海上浮式结构物。在目前MOB的概念设计中，连接器由于承受巨大的载荷因而成为设计中的重点难题。精确计算连接器的动力特性已成为整个系统设计中的关键。本文的研究成果对连接器以及锚链的初步设计具有一定的参考价值。本文利用RMFC刚性模块柔性连接器模型，基于势流理论对半潜式海上移动基地进行三维水动力分析。本文详细描述了刚性模块柔性连接器模型的数学计算方法，在深入理解数学计算方法的前提下，利用matlab编制计算程序。利用SESAM软件中GeniE模块建立超大型浮体Panel模型，导入到HydroD中。分别以3、5、7个模块MOB模型为对象计算了8个浪向角和46个频率规则波下的各个浮体水动力系数和波浪载荷，并提取频域下的水动力系数。导入程序计算了超大型浮式结构各个模块在规则波和不规则波浪中的运动响应和连接载荷动力响应。本文分析了考虑浮体间相互影响和不考虑浮体间相互影响两种不同计算方法、不同连接器刚度和不同浪向、不同海况下超大型浮式结构模块运动和连接器动力响应，并重点论述了不同模块个数对连接器载荷的影响，验证了以上各种因素对连接器具有比较显著的影响。本文根据载荷时间历程，利用S-N曲线和Miner线性损伤理论计算了一种刚性连接器的疲劳寿命和和疲劳可靠性，最后计算出疲劳失效概率。最后对超大型浮式结构物进行基于船舶碰撞和连接器疲劳失效的风险评估研究。按照风险评估的一般流程，即风险识别、风险频率和风险后果分析、风险评价对MOB进行风险评估研究，并提出降低事故发生频率和减小事故破坏后果的措施。利用船舶碰撞概率数学模型计算MOB碰撞概率，分析了MOB连接器的主要失效事件，计算了事故发生的概率和失效后引起的个人风险和社会风险值，得出的风险值位于ALARP（最低合理可行性）区内。更多还原

【Abstract】 More than70%area on the earth is ocean. With the population increasing and industry developing, we need a great quatity of resource and space. Exploitation of oil resource, ocean space and minerals under sea will become the hot topic of the competition all over the world. The exploitation and research of ocean space of Japan, Japan have created offshore oil storing base, and also have tested offshore airport. At present, among the research of developing ocean space, Very Large Floating Structure (VLFS) is a hot topic. VLFS can be used for offshore city, offshore airport, floating harbor, mobile offshore base and so on. In the future, VLFS will not be an imagination.The MOB (Mobile Offshore Base) is a very large floating structure consisting of many semi-submersible modules. In MOB concept design, the connector between modules is the topic problem because it bears very large force. Calculating the force of connectors precisely becomes an important issure in the whole system design. The research of this thesis is valuable in connector design and anchor chain design.This thesis focuses on utilizing RMFC model, based on potential theory to calculate three dimensional hydrodynamic response. The method of calculating RMFC model is described, then a program is writed by Matlab. Use SESAM GeniE module to model the panel model, then use HydroD Multi-body module to calculate the hydrodynamic coefficients of3,5,7module models in8wave angles and46frequencies, and pick up dydrodynamic coefficients.Use the program to calculate every MOB module’s motion and connector force in regular and irregular wave.Calculate molule motion and connector response using coupled and uncoupled method, sonsidering influence of different connector stiffness, different wave angles, different sea states, and influence of number of modules. Obtain some valuable results, and prove that factors above have obvious influence of connectors.Use force in time doman, S-N curve and Miner linear damage theory to calculate connector fatige life and fatigue reliability, at last calculate risk of fatigue failure probability.Finally, assess the risk of MOB based on ship-platform colliding and connector fatigue failure. Assess MOB risk according to risk assessment flow path:as identification of risk, probability of risk, result of risk analysis, evaluation of risk, method of reducing accident and reducing the result of failure. Use ship colliding math model to calculate MOB colliding probability. Obtain the result of probability and individual risk and society risk value. Risk value is in region of ALARP。更多还原