海上风机全寿命可靠性分析研究
发布时间：2018-10-30 18:39
【摘要】：论文通过我国与欧洲海上风电发展过程比较,认为除了风、浪、流等常规荷载外,我国海上风电工程还要着重考虑台风、地震等极端灾害的威胁。因此,对海上风机平台进行全寿命阶段极端灾害下的可靠性分析研究具有重要意义。本论文结合海上风电工程实例,考虑复杂环境因素,研究与评估了海上风机全寿命阶段在台风和地震作用下的可靠度情况,为我国近海风电场的风机结构设计提供了理论指导。 论文首先介绍了海上风机的主要基础型式和国内外海上风电项目的发展历程与前景规划,以及国内外海上风机可靠度分析领域的研究概况。根据可靠度理论及结构可靠度求解方法,针对海上风机可靠性分析特点,在不确定性有限元分析的基础上,以响应面法为核心,结合蒙特卡洛法求解海上风机的可靠度指标,并给出了分析流程图。经不同模型对比,选取p-y曲线法来模拟桩-土非线性作用,并根据海洋平台的腐蚀规律和冲刷规律,确定海上风机四个典型寿命阶段的参数,考虑抗力参数不确定性,建立海上风机全寿命阶段的有限元随机模型。 对台风和地震等环境荷载进行不确定性分析。将台风荷载和地震荷载等效为随机静力模型,以DNV规范为基础,考虑不同的极限状态函数,分别计算了结构在台风作用和地震作用下无法正常工作的失效概率和可靠度指标,并总结典型寿命阶段海上风机在极端灾害下的可靠指标变化规律。通过对随机变量进行灵敏度分析,获得对可靠指标影响较大的随机变量。论文的研究对平台的设计提供了可靠度校核方面的支持,并且对在役平台极端灾害下的安全性检测及评估提供了技术参考。
[Abstract]:By comparing the development process of offshore wind power in China with that in Europe, it is concluded that in addition to conventional loads such as wind, waves and currents, the threat of extreme disasters such as typhoons and earthquakes should be taken into account in offshore wind power engineering in China. Therefore, it is of great significance to analyze and study the reliability of offshore fan platform under extreme disasters in the whole life stage. In this paper, the reliability of offshore wind turbines under the action of typhoon and earthquake is studied and evaluated considering complex environmental factors, which provides theoretical guidance for wind turbine structure design in offshore wind farms in China. Firstly, the paper introduces the main basic types of offshore fan, the development history and prospect planning of offshore wind power project at home and abroad, and the research situation of reliability analysis field of offshore fan at home and abroad. According to the reliability theory and structural reliability calculation method, according to the characteristics of reliability analysis of offshore fan, based on the finite element analysis of uncertainty, the reliability index of offshore fan is solved by combining Monte Carlo method with response surface method as the core. The flow chart of analysis is given. Based on the comparison of different models, the p-y curve method is selected to simulate the pile-soil nonlinear effect. According to the corrosion law and erosion law of offshore platform, the parameters of four typical life stages of offshore fan are determined, and the uncertainty of resistance parameters is considered. The finite element stochastic model of the whole life stage of offshore fan is established. Uncertainty analysis of environmental loads such as typhoons and earthquakes is carried out. The wind load and seismic load are equivalent to stochastic static model. Based on the DNV code and considering different limit state functions, the failure probability and reliability index of the structure which can not work normally under typhoon and earthquake are calculated respectively. The variation law of reliability index of offshore fan in typical life stage under extreme disaster is summarized. By analyzing the sensitivity of the random variables, the random variables which have great influence on the reliability index are obtained. The research in this paper provides support for reliability verification of platform design, and provides a technical reference for the safety detection and evaluation of platforms in service under extreme disasters.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614
本文编号：2300843
[Abstract]:By comparing the development process of offshore wind power in China with that in Europe, it is concluded that in addition to conventional loads such as wind, waves and currents, the threat of extreme disasters such as typhoons and earthquakes should be taken into account in offshore wind power engineering in China. Therefore, it is of great significance to analyze and study the reliability of offshore fan platform under extreme disasters in the whole life stage. In this paper, the reliability of offshore wind turbines under the action of typhoon and earthquake is studied and evaluated considering complex environmental factors, which provides theoretical guidance for wind turbine structure design in offshore wind farms in China. Firstly, the paper introduces the main basic types of offshore fan, the development history and prospect planning of offshore wind power project at home and abroad, and the research situation of reliability analysis field of offshore fan at home and abroad. According to the reliability theory and structural reliability calculation method, according to the characteristics of reliability analysis of offshore fan, based on the finite element analysis of uncertainty, the reliability index of offshore fan is solved by combining Monte Carlo method with response surface method as the core. The flow chart of analysis is given. Based on the comparison of different models, the p-y curve method is selected to simulate the pile-soil nonlinear effect. According to the corrosion law and erosion law of offshore platform, the parameters of four typical life stages of offshore fan are determined, and the uncertainty of resistance parameters is considered. The finite element stochastic model of the whole life stage of offshore fan is established. Uncertainty analysis of environmental loads such as typhoons and earthquakes is carried out. The wind load and seismic load are equivalent to stochastic static model. Based on the DNV code and considering different limit state functions, the failure probability and reliability index of the structure which can not work normally under typhoon and earthquake are calculated respectively. The variation law of reliability index of offshore fan in typical life stage under extreme disaster is summarized. By analyzing the sensitivity of the random variables, the random variables which have great influence on the reliability index are obtained. The research in this paper provides support for reliability verification of platform design, and provides a technical reference for the safety detection and evaluation of platforms in service under extreme disasters.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614
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本文编号：2300843
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