Performance-based target reliability analysis of offshore wind turbine mooring lines subjected to the wind and wave风浪作用下海上风机系泊缆的基于性能目标可靠性分析
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Safari M, Ghasemi SH, Nowak AS, 2024. Performance-based target reliability analysis of offshore wind turbine mooring lines subjected to the wind and wave. Probabilistic Engineering Mechanics, 77: 103673.DOI: 10.1016/j.probengmech.2024.103673
可靠性评估是结构设计和服役的关键环节，特别是在平衡安全性和成本方面。本文提出了一类新方法，用于评估海上浮式风机平台的基于性能目标可靠性。该方法侧重于平台的运动模式和波浪频率，这些因素显著影响系统结构完整性和性能。提出了一类改进的极限状态函数，以提高可靠性计算精度，特别是稳态条件下。详细分析了平台的六自由度运动，以研究其与波浪频率的相依性。通过考虑其时变响应以及波浪特征、波浪冲击方向和风作用的不确定性，进行整体可靠性分析，以评估平台稳定模态。本文引入了 “基于性能的可靠性” (reliability performance-based, RPB) 这一新概念，以评估系统在给定性能水平下的可靠性。此外，定义了一类最优目标可靠性指标，以应对设计过程中的经济因素。所提方法侧重于计算波浪特征和风作用对浮式风机平台的不确定性，包括风浪荷载及其在系统中传播的详细研究。通过结合统计模型量化不确定性，应用蒙特卡罗模拟评估其对平台可靠性的影响。这类方法使我们能够深入理解环境因素与结构响应之间的相互作用，提高可靠性评估的精度。它确保浮式风机平台在设计和服役时，既考虑经济效益，又兼顾安全性。通过提供整体可靠性评估框架，有助于优化浮式风机平台的设计和决策过程。关键词: 目标可靠性, 北海联合海浪计划谱, 海上风机组, 基于性能设计, 海上风机, 系泊缆, 剩余承载力Reliability assessment is a crucial aspect of the design and operation of structures, particularly in balancing safety and cost considerations. This paper introduces a novel method for evaluating the performance-based target reliability of floating wind turbine platforms in offshore environments. The method focuses on the platform's motion modes and wave frequencies, which significantly influence the system's structural integrity and performance. An improved limit state function is proposed to enhance the accuracy of reliability calculations, specifically for steady-state conditions. The platform's six degrees of freedom motions are carefully analyzed to investigate their dependence on wave frequencies. By considering the time response of these motions and accounting for uncertainties in wave characteristics, wave impact directions, and wind effects, a comprehensive reliability analysis is conducted to assess the stability modes of the platform. This paper introduces the term 'Reliability Performance-Based' (RPB) analysis as a new concept to evaluate the system's reliability at a given performance level. Furthermore, an optimal target reliability index is defined to address the economic aspect of the design process. The proposed methodology's PEB analysis focuses on capturing uncertainties in wave characteristics and wind effects on floating wind turbine platforms. This includes a detailed examination of wave and wind-induced loads and their propagation through the system concerning its performance level. Statistical models were integrated to quantify these uncertainties, applying Monte Carlo simulations to assess their effects on the platform's reliability. This approach allows for a nuanced understanding of the interactions between environmental factors and structural responses, enhancing the precision of our reliability assessments. It enables the consideration of economic efficiency alongside safety, ensuring a balanced approach to the design and operation of the floating wind turbine platform. By providing a comprehensive reliability assessment framework, it aids in the optimization of design and decision-making processes for floating wind turbine platforms.
Keywords: Target reliability; JONSWAP spectrum; Offshore wind turbines; Performance-based design; Offshore wind turbine; Mooring line; Residual capacity.![]()
图 1: 用于极端事件分析的美国加利福尼亚州尤里卡附近的美国数据浮标中心与沿海数据信息计划站Fig. 1. National Data Buoy Center (NDBC) and Coastal Data Information Program (CDIP) stations near Eureka, California, used in extreme event analysis
Fig. 2. Cumulative installed capacity (MW) and number of turbines by country
Fig. 3. Roadmap of the proposed RPB
图 4: 来源: 美国能源信息署的电力净发电量开放数据Fig. 4. Source: U.S. Energy information Administration's open data APL, electricity net generation
Fig. 5. Wave direction rose (CDIP 094), and wind direction rose (NDBC 46022)
Fig. 6. A schematic of the turbine and mooring system
Fig. 7. Comparison between experimental and analytical results
Fig. 8. Reliability index of the mooring system
作者信息 | Authors
伊朗加兹温阿扎德大学 (Qazvin Azad University) 土木工程系
Seyed H. Ghasemi, 通讯作者 (Corresp.)美国阿拉巴马大学伯明翰分校 (University of Alabama at Birmingham) 土木建筑与环境工程系Email: ghasemis@uab.edu
美国奥本大学 (Auburn University) 土木与环境工程系
律梦泽 M.Z. Lyu | 编辑 (Ed)
P.D. Spanos | 审校 (Rev)
陈建兵 J.B. Chen | 审校 (Rev)
彭勇波 Y.B. Peng | 审校 (Rev)
