基于nsga-ⅱ的海星浮筒壳体结构优化-船舶与海洋结构物设计制造专业论文.docxVIP

基于NSGA．II的海星浮筒壳体结构优化Structure 基于NSGA．II的海星浮筒壳体结构优化 Structure optimization of the sea—star pontoon shell based onOn Abstract With the development of oil and gas exploration in the deep water and ultra-deep water，a series of new marine equipments and production modes have been proposed． China has started lately to make an effort in the development of deepwater marine equipment，but there are still a series of problems to be solved．In this thesis，a new ultra-deep water disastrous marine environment adaptive oil and gas development and supporting system— subsurface tension leg production system(STLP)，fitting for peculiar problems of ultra—deep water oil and gas exploration in the South China Sea environment，has been brought into a series of structure design and optimization． STLP system mainly consists of four parts as a well completion and oil and gas transmission system：truss sea-star pontoon，top tensioned riser tensioned by truss sea-star pontoon and connected with subsea wellhead，well completion installed on top of truss sea-star pontoon．flexible jumper connected witll well completion and floating production storage and offloading．In this thesis，structure design and optimization of part of truss sea—star pontoon will be done based on structure preliminary design of it． The main research contents include：structure design of shell thickness and stiffening rings of T--SSP truss cantilever structure；structure optimization ofthe sea·-star pontoon shell by means of Non—Dominated Sorting Genetic Algorithm II(NSGA-II)based on API specification；finite element analysis of truss sea-star pontoon． The contribution of this thesis is to operate structure design and optimization of the sea-star pontoon，which lays the groundwork for the future research。Lessons in the application of structure design and optimization ofpressure vessel Can also be learned from the work in this thesis． Key Words：STLP system；submerged pontoon；NSGA·II；structure optimization II— 万方数据 大连理工大学硕士学位论文目 大连理工大学硕