船舶最小回转半径

本文确定了动稳定船舶的最小定常回转半径,进而就可把最优化方法应用于船舶操纵性设计中去。 基于线性化操纵运动方程,在优化过程中,把船体诸形状参数和舵面积作为设计变量,把回转性指数的倒数作为目标函数,把动稳定准则c′作为优化的约束条件。 根据计算结果,本文清晰地阐明了船体某些形状参数及舵面积的变化对最小回转半径的影响。

MINIMUM TURNING RADIUS OF SHIPS

The minimization of the steading turning radius for course stable ships has been realized. The author aims at applying optimization to ship manoeavrability design.This paper outlines the optimization problem. In the manoeuvring design the ship form parameters and rudder area are considered as design variables, the inverse of turning index, 1/K', is taken as the measure of merit function, and the dynamic stability criterion is taken as the hydrodynamic restriction condition. The equations of motion for manoeuvring are linearized in the optimization process.The Tangent Search Method, which belongs to the family of "Feasible Direction Methods", is selected as optimization method. The computing experience shows that the application of this method to this problem is very satisfactory.The effects of the changes in hull geometry and rudder area on the minimum turning radius are indicated in the results ofcomputations. Under the condition of limiting a certain value of the stability, which also delends on the design variables C_B, B/T, L/T, A/LT, increasing the rudder area coefficient A/LT and decresing L/T are favourable to reduced radii. But changing of either C_B or B/T has an unimportant influnce.