【作者】 刘毅；

【导师】 王晋； 胡志强；

【作者基本信息】 上海交通大学 ， 船舶与海洋结构物设计制造， 2014， 硕士

【摘要】 本论文系统性地提出了一套海上浮式风机结构强度分析方法。海上浮式风机是一种新兴事物，目前的设计和研究还处于起步阶段，国内外还缺乏统一认可的强度分析方法。与一般海上结构物不同，浮式风机所受的风载荷与波浪载荷相互耦合，单纯依靠传统海上平台结构分析方法无法有效评估其结构强度。本论文以NREL₅MW “Hywind”单柱式浮式风机为研究对象，从分析总体性能入手，提出了一种结合风机动态特性的结构强度分析方法。利用空气-水动力耦合分析技术和FAST软件开展时域动态仿真模拟，选取关键物理量预报其载荷性能，根据浮式风机受力特点选取危险状态，并分析整体结构在危险工况下的受力。进一步探讨了结构分析中涉及的结构建模、典型工况选取、载荷加载等关键技术，并提出解决方案：采用SESAM软件建立结构模型，根据极限载荷预报值确定计算工况，利用时历响应结果对结构施加瞬时外载荷，其中波浪载荷采用准静态方法。在此基础上，利用本文提出的方法，对NREL₅MW风机进行了结构分析，并校核其总体结构强度，验证了结构设计的合理性和该方法的可行性。该结构强度分析方法可适用于多种海上浮式风机的总体强度分析。本文的计算结果可作为海上浮式风机总体强度评估的依据，本文的研究为今后浮式风机的结构设计及校核提供了技术支撑。更多还原

【Abstract】 An integrated procedure for structural strength analysis of spar typefloating offshore wind turbine （FOWT） is proposed in this paper. Althoughthere has been some investigation into structural design and analysis asoffshore floating wind turbine has proposed to become one promisingconcept for exploiting wind energy in deep coastal areas, a globalacknowledged structural strength analysis method is still lacking. Inaddition, due to the difference of multi-coupling loads suffered by FOWTsand marine structures, the global structural strength can’t be accessedeffectively by traditional offshore platform structure analysis methods.In order to develop the numerical approach needed to calculate theglobal structural strength of a floating offshore wind turbine, theNREL₅MW “Hywind” prototype is adopted here as a case study. Astochastic method is applied to calculate the global responses, and timedomain simulations are performed by an aero-hydro-servo-elasticfully-coupled tool （FAST）. The turbine is found to be susceptible toexcessive loading at extreme events, when the suggested criticalparameters reach maximal values. Selections of design load cases aredefined for further structural analysis.An in-depth study has also conducted for key technologies such asstructural modeling, load case definition and load mapping; suitablesolutions are given by using SESAM software to establish the structuralmodel and adopting the quasi-static method to apply the transient loadsonto the structural model, in which the design load parameters areidentified based on time series output. A structural design and analysis is also performed for theNREL₅MW wind turbine based on the strength analysis method proposedin this paper. The stress results and its distribution are obtained byconducting FEM analysis, thus provide basis for evaluation of globalstructure strength.In this paper, the structural design and strength analysis method for aspar type floating offshore wind turbine is verified. In addition, thismethod can be used to perform structural strength analysis for multi-typefloating offshore wind turbines. Furthermore, this research can providetechnical support for future floating wind turbine structural design andanalysis.更多还原