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
正Director of Ceremonies, Your Excellencies, Ministers here present, Chinese State Leaders, Heads of Chinese NGOs, Representatives of International NGOs, Ladies and Gentlemen, Let me first and foremost express my hear...正Director of Ceremonies, Your Excellencies, Ministers here present, Chinese State Leaders, Heads of Chinese NGOs, Representatives of International NGOs, Ladies and Gentlemen, Let me first and foremost express my heartfelt gratitude to the Chinese Association for International Understanding for inviting me to展开更多
Festus Mogae, the third president in the history of the Republic of Botswana, served between April 1998 and March 2008. Before that, he had been the Vice-President for 6 years. During his presidency, Mogae managed to ...Festus Mogae, the third president in the history of the Republic of Botswana, served between April 1998 and March 2008. Before that, he had been the Vice-President for 6 years. During his presidency, Mogae managed to maintain the stability and prosperity of Botswana, thanks to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.
文摘正Director of Ceremonies, Your Excellencies, Ministers here present, Chinese State Leaders, Heads of Chinese NGOs, Representatives of International NGOs, Ladies and Gentlemen, Let me first and foremost express my heartfelt gratitude to the Chinese Association for International Understanding for inviting me to
文摘Festus Mogae, the third president in the history of the Republic of Botswana, served between April 1998 and March 2008. Before that, he had been the Vice-President for 6 years. During his presidency, Mogae managed to maintain the stability and prosperity of Botswana, thanks to
