规则波浪中舰船操纵运动计算

当船舶在波浪中处于尾斜浪或顺浪航行时,可能出现稳性丧失和横甩等现象,所以船舶在波浪中的操纵性问题已引起人们的关注.目前,关于该问题的大多数研究往往局限在有限的浪向角范围内.本文在船舶静水操纵性基础上,直接迭加高频的波浪力,建立一个波浪中高频运动响应的操纵性预报方法.用二维Frank源汇分布法计算船舶随摇荡频率变化的附加质量———波浪的辐射力,以及规则波浪的扰动力———Froud Krylov力,在六自由度运动方程上直接迭加所计算的波浪力,并引用静水操纵中船、桨、舵水动力的计算模型,建立了规则波浪中船舶操纵运动预报模型,并数值计算了一条高速方尾船舶在不同规则波浪的波长、波高和浪向角下的操纵舵回转运动和Z形操纵舵运动,附加质量和波浪扰动力根据运动中的遭遇频率和浪向角确定.数值计算的回转角速度、横倾角和纵倾角的变化规律与文献中单桨单舵船模试验有着相似结果.

Maneuvering prediction of a ship in regular waves

When a ship is sailing in waves,stability loss and broaching may arise.Therefore,the ship's maneuvering performance in waves is paid attention to .Usually this phenomenon appears in cases of quartering sea or following sea.Thus most research on ship maneuvering in waves is often restricted to a certain range of wave angle.Until now predictions of maneuverability in calm water and seakeeping performance in waves have been independent.But it is very important to integrate the two prediction methods efficiently into one for predicting maneuvering performance in waves.In this paper,based on the MMG model in calm water,the regular wave forces were directly added to the maneuvering motion equations as exciting forces,and the well-known strip method was used to calculate the added-mass as radiation forces and the exciting forces-Froud-Krylov forces.A prediction method of ship maneuvering in regular waves was established.The numerical simulation for a high-speed ship was carried out and the results were compared with model test data published by others.The varieties with time for the yawing,rolling and pitching were very similar to model test data.