基于船舶兴波能量守恒的形状因子算法

为了拓展传统的根据船模阻力试验数据确定形状因子计算方法的适用测量速度范围，文章提出了基于船舶兴波能量守恒的形状因子计算方法。该算法以兴波阻力系数的理论近似表达式取代ITTC（1978）方法的兴波阻力系数近似表达式，采用梯度下降最优算法对船模阻力试验数据进行数值拟合计算求得形状因子。以4250 TEU集装箱船作为算例，将文中算法同传统的普鲁哈斯卡法和ITTC（1978）方法的计算结果进行了比较，验证了该算法的合理性和精确性。

Calculation method of form factor based on energy conservation of ship wave-making

In order to expand the applicable measurement speed rang of the traditional method which is used to determine the form factor by the ship model test data, this paper presents a calculation method of form factor based on energy conservation of ship wave-making. In this method, from energy conservation of ship wave-making, the theoretical approximation formula of wave-making resistance can be obtained and replace the one used in ITTC (1978) method. New expression of total resistance coefficient can be achieved and used to determine the parameters by using gradient descent algorithm, and then form factor can be ac-quired. Finally, for a test case of 4250 TEU Container Vessel, by comparing with traditional Prohaska and ITTC (1978) methods, the feasibility and accuracy of proposed method were validated.