Naval high speed light craft (HSLC) can be vulnerable to fatigue damage due to their lightweight scantlings and operation in sometimes harsh environments. Fatigue cracking can lead to costly repairs and reduction of operational availability. One fatigue analysis method is spectral fatigue analysis (SFA), which explicitly includes the operational profile and wave environment. However, typically, only linear loads are taken into account. Furthermore, fatigue analysis is influenced by the uncertainty in the input parameters and modelling procedure. This paper presents validation of SFA against trials data, followed by a study on the sensitivity of fatigue damage incurred in a naval HSLC to various parameters. It was found that the fatigue damage was most sensitive to the significant wave height, though when operational conditions were taken into account the relative importance of the speed and heading increased. The presented work is relevant to the through-life management of naval ship structures.

海军高速轻型飞行器（HSLC）由于其轻巧的尺寸和有时在恶劣环境下的操作而容易受到疲劳破坏。疲劳破裂会导致昂贵的维修费用并降低运营可用性。一种疲劳分析方法是频谱疲劳分析（SFA），该方法明确包括操作剖面和波浪环境。但是，通常只考虑线性负载。此外，疲劳分析受输入参数和建模过程不确定性的影响。本文针对试验数据对SFA进行了验证，然后对海军HSLC对各种参数造成的疲劳损伤的敏感性进行了研究。发现疲劳损伤对明显的波高最敏感，尽管考虑到操作条件，但速度和航向的相对重要性却有所提高。提出的工作与海军舰船结构的整个生命周期管理有关。