波导升力矩对快速船在尾斜浪中横甩的影响(英文)

Importance of Wave-Induced Lifting Moment in the Broaching-to Problem of a Fast Ship in Quartering Seas

本文结合船舶操纵性和耐波性理论及其研究成果 ,引入一等效首摇角速度的概念表达环绕横甩中的船舶的波导水质点速度 ,由此可以用静水中船舶操纵运动的水动力导数 Nr′估算波导升力矩。数值计算比较表明 :波导升力矩与Froude -Krylov力矩是属同一数量级。本文还讨论了横甩后的不稳定机理。

The wave-induced water particle velocity around a ship under the broaching-to condition is expressed in term of an equivalent yaw rate so that the hydrodynamic derivative for ship manoeuvre motion in calm water can be used for estimation of the wave-induced lifting moment.The numerical comparison shows that the wave-induced lifting moment is in the same order of magnitude as the Froude-Krylov moment.A destabilization mechanism behind the broaching-to is discussed.