自由液面对大倾角稳性的修正计算方法

本文提出了按最大倾斜力矩进行自由液面对大倾角稳性影响计算的修正方法.按静力学原理研制出准确计算液舱自由液面对复原力臂曲线影响的软件模块,对任意形状舱室可快速计算出任意横倾角下不同装载率时自由液面移动产生的倾斜力矩,从而求出液舱在任意横倾角下的最大自由液面力矩及其对应的装载率.通过与规范的近似计算法的比较,阐述了不同方法对不同液舱形状进行自由液面修正时的准确程度.借助对不同形状的规则舱形以及油船的各种实际液体舱形进行自由液面修正计算,验证了本文所提出的按最大自由液面力矩进行自由液面修正的合理性.

A Correction Method on the Influence of Free Surface on Great Inclining Angle Stability

In this paper, a new correction method is proposed to calculate the influenc e of free surface on great inclining angle stability by using the maximal inclin ing moment. Based on hydrostatics, a computer program is developed to calculate accurately the influence of free surface on righting arm curve, which can calcul ate rapidly and accurately the inclining moments caused by the movement of free surface in the arbitary shape of liquid tank at any loading rate and at any trim angle. And its veracity is compared among the regulation correction and the cen ter of gravity shifting correction by calculating the free surface influence of different shape of tank. Calculation examples on the free surface correction of several regular tanks with different shapes and various liquid tanks of an oil t ank show that the method proposed by authors is reasonable, reliable and practic able.