Energy optimization is one of the key problems for ship roll reduction systems in the last decade. According to the nonlinear characteristics of ship motion, the four degrees of freedom nonlinear model of Fin/Rudder r...Energy optimization is one of the key problems for ship roll reduction systems in the last decade. According to the nonlinear characteristics of ship motion, the four degrees of freedom nonlinear model of Fin/Rudder roll stabilization can be established. This paper analyzes energy consumption caused by overcoming the resistance and the yaw, which is added to the fin/rudder roll stabilization system as new performance index. In order to achieve the purpose of the roll reduction, ship course keeping and energy optimization, the self-tuning PID controller based on the multi-objective genetic algorithm （MOGA） method is used to optimize performance index. In addition, random weight coefficient is adopted to build a multi-objective genetic algorithm optimization model. The objective function is improved so that the objective function can be normalized to a constant level. Simulation results showed that the control method based on MOGA, compared with the traditional control method, not only improves the efficiency of roll stabilization and yaw control precision, but also optimizes the energy of the system. The proposed methodology can get a better performance at different sea states.展开更多
针对船舶运动的非线性本质,为舵鳍联合系统建立了具有通用性的非线性数学模型。首先基于MMG(Ship Manoeuvring Mathematical Model Group)的建模思想,建立一个包含风、浪、流干扰的4自由度舵鳍联合非线性数学模型,并详细给出了模型涉及...针对船舶运动的非线性本质,为舵鳍联合系统建立了具有通用性的非线性数学模型。首先基于MMG(Ship Manoeuvring Mathematical Model Group)的建模思想,建立一个包含风、浪、流干扰的4自由度舵鳍联合非线性数学模型,并详细给出了模型涉及的参数及流体动力导数的计算公式。然后利用该模型对"Hual Trooper"号汽车运输船及"Belnor"号散货运输船进行回转试验及Z形试验的仿真,得到了一系列与实船试验曲线接近的仿真曲线。仿真结果说明了该模型的正确性和工程可行性。展开更多
为了研究船舶在固定航速下横荡、横摇和艏摇三个自由度运动的舵鳍联合减摇与航向保持控制问题,通过状态空间的划分,将状态含有绝对值的系统转化成为不含绝对值的切换系统,利用SOS(sum of squares)技术,分别设计了非线性状态反馈切换控...为了研究船舶在固定航速下横荡、横摇和艏摇三个自由度运动的舵鳍联合减摇与航向保持控制问题,通过状态空间的划分,将状态含有绝对值的系统转化成为不含绝对值的切换系统,利用SOS(sum of squares)技术,分别设计了非线性状态反馈切换控制器和单控制器,并结合Lyapunov稳定性理论给出了闭环系统镇定的充分条件。仿真结果表明:在外扰的影响下,所设计的控制器使得船舶减摇效果明显,而且能够保持期望的航向。展开更多
基金Foundation item： Supported by the National Natural Science Foundation of China （Grant No. 61174047） and the Fundamental Research Funds for the Central Universities （HEUCF041406）.
文摘Energy optimization is one of the key problems for ship roll reduction systems in the last decade. According to the nonlinear characteristics of ship motion, the four degrees of freedom nonlinear model of Fin/Rudder roll stabilization can be established. This paper analyzes energy consumption caused by overcoming the resistance and the yaw, which is added to the fin/rudder roll stabilization system as new performance index. In order to achieve the purpose of the roll reduction, ship course keeping and energy optimization, the self-tuning PID controller based on the multi-objective genetic algorithm （MOGA） method is used to optimize performance index. In addition, random weight coefficient is adopted to build a multi-objective genetic algorithm optimization model. The objective function is improved so that the objective function can be normalized to a constant level. Simulation results showed that the control method based on MOGA, compared with the traditional control method, not only improves the efficiency of roll stabilization and yaw control precision, but also optimizes the energy of the system. The proposed methodology can get a better performance at different sea states.
文摘为了研究船舶在固定航速下横荡、横摇和艏摇三个自由度运动的舵鳍联合减摇与航向保持控制问题,通过状态空间的划分,将状态含有绝对值的系统转化成为不含绝对值的切换系统,利用SOS(sum of squares)技术,分别设计了非线性状态反馈切换控制器和单控制器,并结合Lyapunov稳定性理论给出了闭环系统镇定的充分条件。仿真结果表明:在外扰的影响下,所设计的控制器使得船舶减摇效果明显,而且能够保持期望的航向。
