基于船舶兴波能量守恒的形状因子算法.pdfVIP

第 卷第 期 船舶力学 19 5 Vol.19 No.5 年 月 2015 5 Journal of Ship Mechanics May 2015 文章编号： （ ） 1007-7294 2015 05-0477-07 基于船舶兴波能量守恒的形状因子算法 王文华， 顾溟宇， 王言英 （大连理工大学船舶工程学院， 辽宁大连，116024） 摘要： 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 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。 关键词： 船舶阻力； 三因次换算； 形状因子； 兴波能量守恒； 梯度下降最优算法； 集装箱船 中图分类号： U661.31 文献标识码： A doi: 10.3969/j.issn.1007-7294.2015.05.001 Calculation method of form factor based on energy conservation of ship wave-making WANG Wen-hua, GU Ming-yu, WANG Yan-ying (School of Naval Architecture, Dalian University of Technology, Dalian 116024, China) Abstract ： 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鄄 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. Key words: shi