Decoupling analysis between yaw and collective pitch controls of coaxial helicopter using free wake arithmetic
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摘要: 共轴式直升机的航向操纵主要依靠上下旋翼的总距差动实现,在总距和航向操纵上有较强的耦合.利用自由尾迹算法对在研小型共轴式直升机悬停时的航向和总距间的解耦进行了计算,得到了悬停时航向与总距操纵时上下旋翼的总距配合曲线,总结了解耦控制的特点并根据数值计算结果拟合出了近似的解耦函数,计算结果对飞控系统的设计具有重要的指导意义.Abstract: The yaw control of coaxial helicopters is gained from the differential control of collective pitches of up and down rotors. Hence, a coupling phenomenon can be found. Employing the free wake arithmetic, the aerodynamic analysis for the small coaxial helicopter was made, mainly focusing on the coupling between yaw and collective pitch controls in hover flight. The computation showed the relationship between collective pitches of two rotors when the yaw control or collective pitch control was given. From those results, the characteristics of decoupling control could be identified. And those data was transformed into several simple functions using the curve fitting method. These results will be significant for designing the flight control system.
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Key words:
- free wake /
- coaxial helicopter /
- decoupling control
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