船舶垂荡与纵摇耦合运动频率散射机制研究

Research on Frequency Scattering Mechanism of Oscillatory Pitch and Heave Coupling Motions of a Ship

针对船舶纵向速度振荡对垂荡与纵摇耦合运动建立运动响应模型,基于弗劳德-克雷洛夫假定,采用切片法推导切片的浮力、阻尼力和惯性力,通过对切片的积分得到了船体垂荡与纵摇的水动力(矩),推导并得到垂荡与纵摇耦合运动响应方程。以某隐身船为实例,初步分析遭遇频率散射强度和散射频率对耦合运动的影响,得到增大散射强度和散射频率可以减弱耦合运动及其剧烈程度的初步结论。

Considering ship longitudinal velocity vibrating,the coupling motion response model of oscillatory pitch and heave motions was setup.On the basis of the Froude-Krylov hypothesis,the buoyancy,damping and inertia forces of strips were obtained by strip method.The hydrodynamic loading of ship pitch and heave were made by integration of forces of strips and then the coupling motion response equations were obtained.For an example of a ship,the effects of ship scattering intensity and frequency on coupling motions were preliminarily analyzed and the preliminary conclusion that oscillatory pitch and heave motions can be weaken by increasing of scattering intensity and frequency was obtained.