分布式螺旋桨飞机推/控耦合偏航控制方法

Yaw control method for distributed propeller aircraft via thrust/control coupling

  • 摘要: 为达成分布式推进飞机通过多台螺旋桨之间的推力差实现偏航控制,开展本文研究。首先,基于差分法,采用计算流体力学方法实现分布式推进飞机动导数的计算,用于动力学方程中气动力与力矩模型的构建。然后建立了面向分布式推进飞机的非线性飞行动力学模型,将飞机的飞行控制系统分为内、外回路子系统,并采用基于扩张状态观测器(extended state observer, ESO)的动态逆控制方法为子系统进行控制算法的设计。最后,以偏航控制为目标开展控制仿真,结果表明,采用基于ESO的动态逆控制方法设计的推/控耦合方案达到了预期的控制性能,实现了90°偏航控制。ESO的引入,增强了动态逆控制器的鲁棒性,使得飞机在控制过程中可以有效地抵抗外界干扰。

     

    Abstract: To achieve the yaw control of a distributed propulsion aircraft through the thrust difference between multiple propellers, the research has been conducted. Firstly, based on the differential method, the Computational Fluid Dynamics (CFD) method is used to calculate the dynamic stability derivative of the distributed propulsion aircraft, which is used to construct the aerodynamic force and moment models in the dynamic equations. Then the 6-DOF nonlinear flight dynamic model of the distributed propulsion aircraft is established. Based on the principle of time scale separation, The flight control system of the distributed propulsion aircraft is divided into inner and outer loop subsystems, and the dynamic inverse control method based on the Extended state observer (ESO) is used to design the control algorithm for the subsystems. Finally, the control simulation is carried out with yaw control as the goal. The results show that the thrust/control coupling method designed by the dynamic inverse control method based on ESO achieves the expected control performance and realizes 90 degree yaw control. The introduction of ESO enhances the robustness of the dynamic inverse controller, enabling the distributed propulsion aircraft to effectively resist external disturbances during the control process.

     

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