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Mathematical modeling and control of a tilt-rotor aircraft

机译：倾转旋翼飞机的数学建模与控制

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This paper presents a novel model of large-size tilt-rotor aircraft, which can operate as a helicopter as well as being capable of transition to fixed-wing flight. Aerodynamics of the dynamic large-size tilt-rotors based on blade element method is analyzed during mode transition. For the large-size aircraft with turboshaft engines, the blade pitch angles of the rotors are regulated to vary according to the desired level of thrust, and the following expressions are formulated explicitly: rotor thrust and blade pitch angle, drag torque and blade pitch angle. A finite-time convergent observer based on Lyapunov function is developed to reconstruct the unknown variables and uncertainties during mode transitions. The merits of this design include the modeling of dynamic large-size tilt-rotor, ease of the uncertainties estimation during the tilting and the widely applications. Moreover, a switched logic controller based on the finite-time convergent observer is proposed to drive the aircraft to implement the mode transition with invariant flying height. (C) 2015 Elsevier Masson SAS. All rights reserved.
机译：本文提出了一种新型的大型倾转旋翼飞机模型，该模型既可以用作直升机，又可以过渡到固定翼飞行。在模式转换过程中，分析了基于叶片单元法的动态大型倾斜转子的空气动力学特性。对于具有涡轮轴发动机的大型飞机，旋翼的桨距角被调节为根据所需的推力水平而变化，并且明确地表达了以下表达式：转子推力和桨距角，阻力转矩和桨距角。建立了基于李雅普诺夫函数的有限时间收敛观测器，以重构模式转换过程中的未知变量和不确定性。这种设计的优点包括动态大尺寸倾斜转子的建模，易于估计倾斜期间的不确定性以及广泛的应用。此外，提出了一种基于有限时间收敛观测器的开关逻辑控制器，以驱动飞机实现飞行高度不变的模式转换。 （C）2015 Elsevier Masson SAS。版权所有。

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