An optimum design of directional couplers with four identical but unequal-spacing coupling holes is developed. The paper carries out a set of design data and curves.
提出了四孔等耦合不等间距定向耦合器的最佳设计方法，并给出了设计数据和曲线。
Compared with traditional design optimization method, MDO method can gain the optimum design for flight vehicle as well as the optimum thrust-time curves of booster.
与传统设计优化方法相比，MDO方法一次设计优化就可得到满足飞行器总体设计指标的最优设计，得到内外弹道相匹配的助推器最优推力-时间曲线。
In the present method, the orthogonal design and the three-dimensional viscous flow field computation were used to determine the optimum controlled deceleration flow in impellers and the blade curves.
提出采用可控减速法设计离心风机两元叶片，即通过三维黏性流场计算，采用正交试验设计方法，以确定流道内平均速度的减速规律和叶片型线。
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