摘要
采用六自由度舰船操纵性方程与横摇波浪力矩耦合构成动力学模型,对舰船在规则波浪中的操纵与横摇耦合运动特性进行了模拟研究。其中操纵性方程采用MMG模型,波浪力矩由切片法计算,舰船航向按PD控制。模拟计算了某船正横规则波浪下保持航向的横摇运动,计算结果与单自由度理论结果进行了比较,其幅频曲线与相频曲线两者符合较好,间接证明了耦合构成动力学模型的有效性。在此基础上计算了不同浪向角和航速下的横摇运动,以横摇等值极坐标曲线表征舰船规则波浪中的横摇特性,从而给出了规则波浪下舰船耦合动力学所描述的运动特征。
By uniting maneuvering motion equations of six-freedom degrees and rolling moment of a ship in regular waves, the thesis constructs ship dynamic model, in which MMG model in calm water is adopted and rolling moment is calculated with STF method,and proportional ＆ differential control model is used for keeping course. Based on the above model, this paper simulates rolling motion of a ship keeping course in regular waves. The results of simulation, compared with the theory results of single freedom degree, is very closely in the aspects of amplitude-magnitude-frequency curve and phase-frequency curve, which indirectly proves the effectiveness of coupling dynamic model. Moreover, the paper calculates rolling motion with different wave angle and speed, and then gains the motion characteristics of ship coupling dynamics in regular waves in the form of rolling amplitude isoline in polar coordinates.
出处
《舰船科学技术》
2009年第3期46-50,共5页
Ship Science and Technology
关键词
船舶
操纵性
横摇
规则波浪
耦合
ship
maneuverability
rolling
regular waves
coupling
