Aiming at the problem of the fishing vessel's dynamic characteristics influencing the vessel's reliability and economy when the en-gine and propeller's working point changes under trawling condition,research was done on the vessel's speed, torque, power and other dy-namic characteristics under normal and trawling condition. Based on hull-propeller-engine-net matching theory,through the numerical fitting of propeller characteristic curve,Chebyshev poly nomial analytical form was built up which is suitable for digital simulation research,and the double speed ratio trawler's hull-propeller-engine-net models based on AMESim were set up, simulation research was done on double ratio fishing vessel's operation characteristics under multi condition. The results indicate that double speed ratio propulsion mode can reduce main engine's torque and power while it keeps its rated speed in trawling condition, which improves the reliability and economy effectively, and that the hull-propeller-engine-net matching modeling simulation research results are very close to the actual vessel's operation condition.%针对拖网渔船在拖网工况下主机和螺旋桨匹配工作点发生显著变化,渔船变工况动态特性影响渔船运行可靠性和经济性的问题,对双速比渔船在正常航行工况和拖网工况下的航速、扭矩、功率等动态特性进行了研究.基于船机桨网匹配理论模型,通过对螺旋桨特性曲线进行数值拟合,构建了适合数字仿真研究的Chebyshev多项式解析形式,建立了基于AMESim的双速比拖网渔船机桨网匹配数学模型,对双速比渔船在多工况下的运行特性进行了仿真研究.研究结果表明:双速比推进方式能够使主机在拖网工况时维持额定转速的状态下降低主机扭矩和功率,有效地提高动力系统的可靠性和经济性,基于AMESim的船机桨网匹配建模仿真研究结果与实船运行情况十分接近.
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