文摘为解决大型船舶非线性Norrbin数学模型精度不高的问题,将其与船舶大型化有关的4个流体动力导数适当放大;将Norrbin给出的2个非线性力(矩)经验公式在增加物理意义的基础上也适当放大。以40万吨级大型矿砂船"Vale Brasil"为例,将改进的Norrbin模型、原Norrbin模型和MMG(Manoeuvring Mathematical Model Group)模型与2组实船试验数据进行比较。结果表明,改进模型与实船数据的符合度最好,精度比MMG模型提高5.5%,比原Norrbin模型提高约14%,保留了原模型的参数少且物理意义明显的优点。
基金This work was supported in part by the National Natural Science Foundation of China (60474014)in part by the Specialized Research Fund for the Doctoral Program of Higher Education of P.R.C. under grant (20040151007)in part by the Application foundation Research Project of Ministry of Communications of P.R.C. under grant (200432922504)
