深V型船零速横摇改善措施

Method of reducing the roll amplitude of a deep-vee hull at zero speed

针对千吨级深V型船在高海况下其零速横摇幅值较大的问题,在拖曳水池中开展静水阻力、横摇衰减模型试验。通过求解非线性横摇方程,预报规则波中的横摇响应,采用双参数谱预报实船在4,5级海况下的零速横摇幅值。同时,对比分析舭龙骨长度、宽度、安装位置以及连续性对阻力、横摇阻尼系数及横摇幅值的影响规律。研究结果表明:在巡航速度至最大航速范围内,可获得阻力增值不超过4.5%,正横浪零速横摇幅值减小25%以上的舭龙骨设计方案,可为千吨级深V型船在锚泊状态下减少横摇幅值提供技术支撑。

A series of resistance and roll decay model tests are conducted in order to solve the large roll amplitude problem of one kiloton deep-vee ship with zero speed under rough sea condition. The roll response in regular waves is first obtained by solving the nonlinear roll motion equation, and the roll ampli- tude of the full scale hull in seaway is then predicted in the ITTC wave spectrum. The influences of length, width, location, and continuity of blige keel on resistance, roll damping, and roll amplitude are studied, respectively. The results indicate that incorporating a kind of bilge keel can reduce the roiling amplitude at zero speed by 25% and control the drag addition within 4.5% from cruising speed to maximum speed. These tests provide technical support to reduce the roll amplitude of kiloton deep-vee hull under the mooring state in seaway.