乌江航道千吨级船舶K、T指数计算方法

K and T Indices Calculation Method of Kiloton Ship on Wujiang River Waterway

为得到乌江航道千吨级标准船型的K、T指数计算经验公式,基于乌江航道和乌江千吨级船舶特点,提出适应于该船型的船舶操纵运动数学模型研讨小组(Ship Maneuvering Mathematical Model Group,MMG)模型,利用船模试验资料验证模型的准确性。利用该模型对一系列千吨级船舶进行模拟仿真,得到Z形操舵运动曲线,并使用野本法得到该系列船舶的无因次化K、T指数。将所得结果作为样本库,利用交叉二次回归方法,计算得到适应于乌江千吨级船舶的无因次化K、T指数计算的经验公式。在此基础上使用3条实船的试验数据验证所提经验公式的精确性。

In order to obtain the K and T indices calculation empirical formula of kiloton standard ship type on the Wujiang River waterway,a Ship Maneuvering Mathematical Model Group(MMG)model adapted to the ship type is proposed based on the characteristics of Wujiang River waterway and kiloton ship,and the model accuracy is verified by the ship model test data.The model is used to simulate a series of kiloton ships,the Z-shaped steering motion curve is obtained,and the dimensionless K and T indices of the series of ships are obtained by the Nomoto method.The results obtained are taken as the sample base,and the empirical formula of dimensionless K and T indices adapted to the Wujiang River kiloton ship is obtained by the cross quadratic regression method.On this basis,the test data of three real ships are used to verify the accuracy of the empirical formula proposed.