大型巡航救助船快速性研究

结合大型巡航救助船的功能需求和主尺度特点,对其快速性进行分析。采用计算流体力学(CFD)技术对原型方案的线型进行阻力性能计算。根据计算结果,分别对艏部轮廓线形状、球艏、呆木和支架进行优化,得到最终方案,该方案的阻力相比原型方案大幅减小。对最终方案进行模型试验,模型试验结果与CFD计算结果的吻合度良好,证明该船采用的线型优化方法是可靠、可用的。

Analysis on Bending and Torsional Coupling Vibration Characteristics of Ship Paddle-Axis System

The ship''s propeller and propulsion shafting are the core of the ship''s operation, and the dynamic characteristics of the paddle-shaft system affect the ship''s operating state. At present, the ship''s paddle-shaft system often has abnormal vibration and noise during operation. Abnormal vibration will affect the stability of the system operation. The appearance of noise also threatens the concealment and safety of the underwater vehicle. Therefore, based on the large ship''s paddle-shaft system, the bending-torsion coupling model of the system based on the eccentricity of the propeller is established based on the Timoshenko beam-axis unit. The transient response analysis of the paddle-axis system is carried out, and the external excitation force is obtained. The influence of the rotating frequency on the bending and torsional vibration response characteristics of the paddle-shaft system. The research conclusion provides a theoretical basis for the improvement of the stability of the ship''s paddle-shaft system and fault diagnosis.