摘要
本文提出了计算双体船的兴波阻力和运用二次规划方法求最小兴波阻力船型的方法。根据Michell的线性薄船理论计算双体船的兴波阻力。通过用双二次样条函数表示船体曲面,双体船的兴波阻力系数表达为型值的二次式。进一步运用二次规划优化方法改进船型,并在目标函数中增加了光顺性项,有效地控制了改型后船体曲面的光顺性。本文计算了双体船在不同间距船宽比下的兴波阻力系数,并对双体间距船宽比为2、FΥ数为0.50的高速双体船加以改进。理论计算取得了明显的降阻效果。模型试验结果表明剩余阻力系数也有较大幅度的下降。理论计算和模型试验结果的一致表明了本优化方法的可靠性。
By introducing biquadratic spline functions to express the ship hullapproximately, the Michell integral of wave resistance of catamaran can be reduced to a standard quadratic in terms of ship offsets, with a set of linearinequality constraints, the optimal solution of ship offsets for minimum wave resistance (additional smooth term of ship hull in the objective function) can be obtained by applying quadratic programming method. In this paper the wave resistance coefficients of catamarans are calculated and compared with the residuary resistance coefficients. In the case of Fn=0.5 and b/B=2, the prototype form of the catamaran is optimized by the proposed method. It can be seen from the calculation results that the wave resistance coefficients of the improved catamaran decrease obviously compared with the wave resistance coefficient of the prototype form. Morever, the theoretically predicted results agree well with the experimental data.
出处
《中国造船》
EI
CSCD
北大核心
1990年第2期1-15,共15页
Shipbuilding of China
