垂直安定面受损飞机横航向稳定性的鲁棒$H_{\infty}$回路成形微分推力控制方法
Robust $H_{\infty}$ Loop-Shaping Differential Thrust Control Methodology for Lateral/Directional Stability of an Aircraft with a Damaged Vertical Stabilizer
摘要：
垂直安定面是提供飞机方向稳定性的关键气动面，而副翼和方向舵是给予飞行员偏航和倾斜机动控制权的主要操纵面。因此，失去垂直安定面将导致横向/方向稳定性和控制的相应损失，这可能导致致命的碰撞。在本文中，我们构建了一个场景的损坏的飞机模型，没有物理舵控制面，然后提出了一种策略的基础上，差分推力被用作控制输入，作为一个"虚拟"舵，以帮助保持稳定性和控制的损坏的飞机。基于$H_{\infty}$回路成形方法的鲁棒控制系统设计实现了稳定、鲁棒的飞行包线，以保证飞机安全着陆。研究结果表明，成功地应用这种鲁棒的差动推力方法，损坏的飞机可以实现稳定的可行的控制范围内。最后，鲁棒性分析结果表明，在不确定性的存在下，损坏的飞机的稳定性和性能保持在理想的范围内，并证明不仅是一个强大的，但通过建议的$H_{\infty}$回路成形鲁棒微分推力控制方法的安全飞行任务。
英文摘要：
The vertical stabilizer is the key aerodynamic surface that provides an aircraft with its directional stability characteristic while ailerons and rudder are the primary control surfaces that give pilots control authority of the yawing and banking maneuvers. Losing the vertical stabilizer will, therefore, result in the consequential loss of lateral/directional stability and control, which is likely to cause a fatal crash. In this paper, we construct a scenario of a damaged aircraft model which has no physical rudder control surface, and then a strategy based on differential thrust is proposed to be utilized as a control input to act as a "virtual" rudder to help maintain stability and control of the damaged aircraft. The $H_{\infty}$ loop-shaping approach based robust control system design is implemented to achieve a stable and robust flight envelope, which is aimed to provide a safe landing. Investigation results demonstrate successful application of such robust differential thrust methodology as the damaged aircraft can achieve stability within feasible control limits. Finally, the robustness analysis results conclude that the stability and performance of the damaged aircraft in the presence of uncertainty remain within desirable limits, and demonstrate not only a robust, but a safe flight mission through the proposed $H_{\infty}$ loop-shaping robust differential thrust control methodology.
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