摘要
为了提高Norrbin模型对40万吨级大型船舶的适用性,在不改变该模型非线性力(矩)公式的基础上,将其中与转艏角速度r和转艏角加速度r有关的4个水动力导数适当放大。发现这些水动力导数对Norrbin模型的影响不是均等的,其中的Nr’对改进大型船舶模型的进距和回转直径的效果较为显著。对于满载状态的40万吨级船舶在Matlab试验平台上的测试表明,将这4个水动力导数放大至1.4倍,并在此基础上将Nr’放大至1.8倍,回转曲线可达到96.1%的相合精度,与原Norrbin模型相比,改进后的模型精度提高约26.4%。将该改进思路应用于不同的船型,精度都有显著提高,且图像符合程度较好。
To improve the accuracy of the nonlinear Norrbin model for large-scale such as 400000 tons ships,four hydrodynamic derivatives relating to yaw rate r and yaw acceleration r are magnified 1.4 times,and Nr'is magnified 1.8 times,without changing the nonlinear force(moment)formulas identified by Norrbin.Through repeated tests on the ship motion's mathematical model platform programmed by Matlab,the accuracy of the improved Norrbin model is 96.1%for the full-scale ship turning test,6.4%higher than the original model,and 3.6%higher than previous improvement scheme.The improved Norrbin model is applied to different types of ships,and the accuracy is enhanced significantly.It is found for the first time that the four hydrodynamic derivatives related to the yaw rate r and the yaw acceleration r are not equally affected on the ship model,where and Nr'plays an important role in improving the advanced distance and turning diameter of large ships.
作者
尚翀
张显库
张国庆
SHANG Chong;ZHANG Xianku;ZHANG Guoqing(Navigation College,Dalian Maritime University,Dalian 116026,China)
出处
《中国造船》
EI
CSCD
北大核心
2023年第6期154-161,共8页
Shipbuilding of China
