【作者】 夏侯命胜；

【导师】 刘晓明；

【作者基本信息】 中国舰船研究院 ， 船舶与海洋结构物设计制造， 2011， 硕士

【摘要】 随着大陆架油气资源的日益枯竭,出于国家能源战略需要,我国提出了深海海洋工程发展战略,并开展深海关键工程设备第六代深水半潜式钻井平台自主研发。本文研究了大型深水半潜式钻井平台结构性能分析技术中的结构振动及噪声分析的关键技术,并根据分析结果对目标平台进行了减振降噪设计。提出了大型深水半潜式钻井平台振动与声学优化设计建议,为我国新一代钻井平台的总体设计提供了重要参考。首先,本文在研究深水半潜式钻井平台总体性能、结构设计特点和相关激振源的基础上,研究了半潜平台的振动特性。应用有限元模态叠加法对目标平台在深水作业工况下,进行全船自由振动和受迫振动预报,并采用加权衡准方法对平台作完整振动响应分析评估。其次,通过研究声学理论、噪声预报计算方法和深水半潜式钻井平台声场环境特点,综合应用声学有限元法、统计能量法及其混合法,以专业振动声学软件VA One2009为平台,对目标平台进行了全船、全频域噪声预报,并根据国际海事组织噪声评估标准IMO进行衡准,研究分析了目标平台噪声传播特点与路径。最后,在保证平台结构强度及性能前提下,综合考虑平台振动特性对目标平台进行减振降噪设计研究,在此基础上提出了可行的减振降噪设计方案,保证了新一代钻井平台的安全性和舒适性。本文还建立了深水半潜式钻井平台振动噪声预报及优化基本流程,为将来大型海洋结构物振动声学设计提供了参考,具有实际工程应用价值。更多还原

【Abstract】 With continental shelf oil and gas resources being depleted gradually, for the demands of the energy resource tactic of our nation, the country brings forward the strategy of developing offshore equipment in the deep sea, and researches the primary equipment of the deep-sea exploration, the sixth Deepwater Semi-submersible Drilling Unit, by ourselves. This paper researches the vibration and noise of the Semi-submersible Drilling Unit, and deals with the excessive cabins with method of vibration and acoustic control treatment according to the prediction results. This paper puts forward useful advices for the vibro-acoustic design of the huge Semi-submersible Drilling Unit, and supplys a good reference for the design of our new Semi-submersible Drilling Unit.Firstly, this paper researches the characters of the target unit’s vibration, based on the whole performance and structural design of the Semi-submersible Drilling Unit, applies finite element analysis methods ,when the platform working in the ultra-deep sea , to predict the free vibration and forced vibration, then uses the overall frequency-weighted RMS values to evaluate the vibration response.Secondly, after describing the basic acoustic theory, noise prediction methods and characters of the sound field of the target platform, for the first time introduces FEA, SEA and Hybrid FE/SEA methods to predict the noise of all the cabins in whole sound frequency bands, and evaluates the sound level with IMO guide, then analyzes the characters and propagation ways of the noise.Finally, ensuring the strength and performance of the platform, considering the structural vibration, deals with the platform with NCT. And gives some available suggestions to improve the project and make sure the safety and comfort of the new unit. In this paper, the method step and flowchart to assess the vibro-acoustic of the structure has a certain degree of practical significance in future Semi-submerged platform development.更多还原