maneuverability indices meaning in English

操纵性能指数
操纵指系数

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。