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Structural Fatigue Life Assessment and Sustainment Implications for a New Class of US Coast Guard Cutters

机译：结构疲劳寿命评估和对新型美国海岸警卫队刀具的维持意义

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This paper presents an overview of the US Coast Guard's Fatigue Life Assessment Project (FLAP) and the application of the results in hull structure lifecycle management of the National Security Cutter class. One of the key measurements of the FLAP instrumentation included a radar based wave data measuring system. These measurements were used to determine the operational profile and wave statistics the Cutter encountered for the first five years of service. This information was compared to the design assumptions to understand the differences between design, actual operations, and impact on the long term fatigue damage forecasts. The influence of the operator is discussed. The model tests, dedicated trials and long term monitoring provided valuable insights into the limitations of analysis and predictions. A reliability based fatigue life prediction approach is discussed, along with how they may be used to evaluate options for life cycle management of fatigue and the Return on Investment (ROI) for considering fatigue early in the design. Finally, conclusions and recommendations are provided for the advancement of the spectral fatigue approaches for cost effectively managing fatigue in ship structure.
机译：本文概述了美国海岸警卫队的疲劳寿命评估项目（FLAP），以及该结果在国家安全刀具类的船体结构生命周期管理中的应用。 FLAP仪器的关键测量之一包括基于雷达的波数据测量系统。这些测量结果用于确定刀具在使用的前五年中遇到的运行状况和波浪统计信息。将该信息与设计假设进行比较，以了解设计，实际操作之间的差异以及对长期疲劳损伤预测的影响。讨论了操作员的影响。模型测试，专门的试验和长期监控为分析和预测的局限性提供了宝贵的见解。讨论了基于可靠性的疲劳寿命预测方法，以及如何将其用于评估疲劳生命周期管理的选项以及在设计初期就考虑疲劳的投资回报率（ROI）。最后，为频谱疲劳方法的改进提供了结论和建议，以经济有效地管理船舶结构的疲劳。

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