Abstract: Airfoil sail propulsion technology is of increasing interest aiming at emission peak and carbon neutrality.The wind from the ocean can be used to push the ship forward with the help of a sail structure to achieve the goal of energy conservation and emission reduction, but it will also generate rolling moment on the hull. The combined random wind and wave loads put forward new challenges to the prediction of the dynamic stability of the sailing ships in the wave. For this reason, the dynamic stability under the combined wind and wave loads is studied by using the spectral analysis method and the time domain analysis method with consideration of multiple wind spectrum, wave spectrum, wind direction and wave direction. The spectral analysis method does not consider the system nonlinearity, while the time domain analysis method considers the nonlinearity of the rollrestoring stiffness. It is found that the wind spectrum has little effect on the dynamic stability of the target ship, while the wave spectrum has a greater effect on that than the wind spectrum. The nonlinearity of roll cannot be ignored for the case in the current study. The results can provide theoretical references for the study of the dynamic stability of the airfoil sail-assisted ship under the combined random wind and wave loads.

Key words: sail-assisted ship, dynamic stability, random wind load, random wave load, combinationof wind and wave

摘要： 为实现碳达峰、碳中和目标,翼型风帆助推技术日益受到重视。海洋风能可借助风帆结构推船前进,达到节能减排目的,但同时也会产生作用于船体的横摇力矩。风、浪随机载荷联合作用,为风帆船舶在波浪中的动稳性预报提出了新挑战。为此,考虑了多组风谱、浪谱、风向和浪向,采用谱分析法和时域分析法研究了风浪联合作用下船舶动稳性。谱分析法未考虑系统的非线性,时域分析法考虑了横摇回复刚度的非线性。研究发现风谱对目标船舶动稳性影响很小,波浪谱影响较大;针对该文算例,横摇非线性不可忽略。研究结论可为风浪随机载荷联合作用下翼型风帆助推船舶动稳性研究提供理论参考。

关键词: 风帆助推船舶, 动稳性, 随机风载荷, 随机浪载荷, 风浪联合