本项目以装备螺旋桨为推进装置、舵为控制装置的水面船舶为研究对象，针对船舶在海上航行时操舵回转过程中出现的安全性相关问题开展研究。综合应用基于船舶动稳性、操纵性理论的运动学和动力学分析方法，基于人工智能技术的系统辨识建模和基于计算流体动力学的水动力建模方法，以及数值模拟与模型试验方法，对波浪中的船舶回转-横摇耦合运动进行建模与预报，对回转过程中的船-桨-舵水动力特性进行分析。对于具有一定完整稳性的船舶，研究其在波浪中操舵回转时，在不同船速、操舵速度、舵角下的横摇运动性能，确定在一定波浪条件下操舵回转的安全航速、操舵速度和舵角；对单桨船和双桨船在回转过程中的螺旋桨负荷变化尤其是双桨船内外两桨负荷不均对主机产生的不利影响进行研究，确定安全高效的主机负荷控制策略。通过本项目的研究，对船舶在波浪上回转的安全性进行评估，为制定波浪中安全操舵回转规范提供理论依据，为船舶驾驶人员安全操控船舶提供理论指导。

This project deals with the safety-related problems during turning motion at sea for the steered surface ships equipped with propeller(s) as propulsion device and rudder(s) as control device. The methods of kinematic and dynamic analysis based on theories of ship dynamic stability and manoeuvrability, system identification modelling based on artificial intelligence technology and hydrodynamic modelling based on computational fluid dynamics, as well as the methods of numerical simulation and model test, are synthetically applied to modelling and prediction of the coupled ship turning-rolling motion in waves, and to analysis of the hydrodynamic characteristics of hull-propeller-rudder interaction. For a ship with a certain intact stability, the roll motion performance in waves of the ship steered by rudder under different ship speeds, steering rates and rudder angles is investigated to determine the safe speed, steering rate and rudder angle during turning motion under a certain wave condition. Meanwhile, the negative influence on the main engine(s) due to the changes of the propeller load of a single screw ship or a twin-screw ship, especially the asymmetrical propeller behavior of twin screw ship, is investigated to determine the strategy for a safe and efficient control of the load on main engine(s). Based on the study in this project, the safety of ships during turning motion in waves is evaluated, which can provide the theoretical basis for formulating the standards for safe steering in waves, and provide theoretical guidance for the marine navigator to steer the ship safely.