The third chapter talks about the study of the ship maneuverability index . it brings forward some improving opinions on several steps in the current teaching books and uses new analyzing method to calculate with the experiment data 第三章为船舶操纵性指数的研究,就目前教材上给出的求法,就有些步骤提出改进的意见,并用法改进后的分析方法对试验数据进行计算。
So , it is main problem that set up mathematic model for ship motion simulation . however , the calculating definition of maneuverability motion depends on the hydrodynamic derivatives . for this reason , the purpose of this article is : apply newly hydrodynamic derivatives formula to calculate hydrodynamic forces and offer the ship maneuverability index during the design stages 因此,本文的研究目的是:运用最近提出的水动力导数近似估算公式,获得较为精确的水动力计算,为船舶工程人员在船舶初始设计阶段提供使用工具,使他们在设计时就能较准确地获得实船操纵性能指标。