基于NURBS表达的船舶静水力特性精确计算

在船体曲面NURBS表达基础上,对船舶静水力特性参数进行精确而全面的定义,并结合平面与曲面求交算法和基于曲面表达的几何特性计算方法,对各静水力特性参数进行计算.这种方法不仅适合于传统的静水力特性计算,又适合于任意浮态下的静水力特性计算.对实船正浮状态下的静水力特性进行计算,与传统方法的计算结果进行对比和分析,说明了该定义方法的通用性和实用性;对倾斜状态下的静水力特性进行计算,并总结静水力特性参数值随浮态的变化规律,为船舶自由浮态和静稳性精确计算提供基础.

Precise calculation of ship hydrostatic performances based on NURBS shipform

Based on the NURBS representation of the ship hull,the precise and general definitions of the hydrostatic parameters are given.Combining the plane-surface intersection algorithm and the geometric properties calculation method,the hydrostatic parameters are calculated.This method is appropriate to not only the calculation of the conventional hydrostatic performances but also the ones under any inclination floatation.The hydrostatic performances of the full-scale ships are calculated at zero trim.The calculation results and their comparison with the conventional ones of the full-scale ships verify the generalization and practicality of this method.The hydrostatic performances under inclination condition are calculated and the variation rules of the values of the hydrostatic parameters against floatation are summarized.This study provides foundations for the precise calculation of the free floatation and stability of the ship.