小水线面双体船横摇阻尼特性数值与试验研究

Numerical and experimental investigation on roll damping of small waterplane area twin hull

针对安装稳定鳍的小水线面双体船开展了零速静水自由横摇衰减数值与试验研究。通过不确定度分析验证数值计算方法的可靠性,进而对比船体的线性横摇阻尼和非线性横摇阻尼,并分析摩擦阻尼和稳定鳍对小水线面双体船横摇恢复力矩的影响规律。结果表明:由数值计算求得的自由横摇衰减曲线与试验结果吻合良好;在线性横摇运动假设下,线性横摇阻尼系数随着初始横倾角的增加而增大;将通过数值计算求得的非线性阻尼系数代入到非线性横摇运动方程中能准确地模拟船体的自由横摇衰减运动;摩擦阻尼和稳定鳍对小水线面双体船零速静水自由横摇时的横摇恢复力矩贡献很小。

A SWATH(small water plne area twin hull)installed with stabilizing fins rolling freely in calm water was investigated byboth numerical approachand experimental method.Uncertainty analysis was made toverify and validate the numerical method.Both linear roll damping and nonlinear roll damping were obtained and the contributions of the frictional damping and the stabilizing fins to the roll restorin gmoment were analyzed.The results illustrate that:the numerical free roll decay curve agrees well with the experiment;under the assumption of linear roll mode,the linear roll damping coefficient sees an upward trend with the increase of initial heel angle;the computed free roll decay curves using nonlinear damping coefficients agree well with the experimental results;the frictional damping and the stabilizing fins make minimal contributions to the roll restoring moment for the free roll decay motion in still water.