Roll motion of ships can be distinguished in two parts:an unavoidable part due to their natural movement while turning and an unwanted and avoidable part that is due to encounter with waves and rough seas in general.F...Roll motion of ships can be distinguished in two parts:an unavoidable part due to their natural movement while turning and an unwanted and avoidable part that is due to encounter with waves and rough seas in general.For the attenuation of the unwanted part of roll motion,ways have been developed such as addition of controllable fins and changes in shape.This paper investigates the effectiveness of augmenting the rudder used for rejecting part of the unwanted roll,while maintaining steering and course changing ability.For this purpose,a controller is designed,which acts through intentional superposition of fast,compared with course change,movements of rudder,in order to attenuate the high-frequency roll effects from encountering rough seas.The results obtained by simulation to exogenous disturbance support the conclusion that the roll stabilization for displacement can be effective at least when displacement hull vessels are considered.Moreover,robust stability and performance is verified for the proposed control scheme over the entire operating range of interest.展开更多
为了提高船舶在复杂海况下的操作性能,有效地减小船舶的横摇,保持船舶航行的稳定性,针对船舶舵减摇系统存在的非线性和时变性问题,采用基于PLC的模糊控制方法,由施耐德PLC及其常规输入/输出模块组成模糊控制器,利用Unity Pro XL软件采...为了提高船舶在复杂海况下的操作性能,有效地减小船舶的横摇,保持船舶航行的稳定性,针对船舶舵减摇系统存在的非线性和时变性问题,采用基于PLC的模糊控制方法,由施耐德PLC及其常规输入/输出模块组成模糊控制器,利用Unity Pro XL软件采用模块化编程方法实现其控制功能。在实验室条件下对构建的控制器在舵减摇系统中进行了初步测试,试验表明,基于施耐德PLC实现船舶舵减摇系统模糊控制的制定,既保留了可编程逻辑控制器PLC的灵活性、可靠性、适应能力强等特点,又提高了整个控制系统的智能化程度。展开更多
文摘Roll motion of ships can be distinguished in two parts:an unavoidable part due to their natural movement while turning and an unwanted and avoidable part that is due to encounter with waves and rough seas in general.For the attenuation of the unwanted part of roll motion,ways have been developed such as addition of controllable fins and changes in shape.This paper investigates the effectiveness of augmenting the rudder used for rejecting part of the unwanted roll,while maintaining steering and course changing ability.For this purpose,a controller is designed,which acts through intentional superposition of fast,compared with course change,movements of rudder,in order to attenuate the high-frequency roll effects from encountering rough seas.The results obtained by simulation to exogenous disturbance support the conclusion that the roll stabilization for displacement can be effective at least when displacement hull vessels are considered.Moreover,robust stability and performance is verified for the proposed control scheme over the entire operating range of interest.
文摘为了提高船舶在复杂海况下的操作性能,有效地减小船舶的横摇,保持船舶航行的稳定性,针对船舶舵减摇系统存在的非线性和时变性问题,采用基于PLC的模糊控制方法,由施耐德PLC及其常规输入/输出模块组成模糊控制器,利用Unity Pro XL软件采用模块化编程方法实现其控制功能。在实验室条件下对构建的控制器在舵减摇系统中进行了初步测试,试验表明,基于施耐德PLC实现船舶舵减摇系统模糊控制的制定,既保留了可编程逻辑控制器PLC的灵活性、可靠性、适应能力强等特点,又提高了整个控制系统的智能化程度。
