A Multivariable Robust Adaptive Control Scheme for Aero-engines

This paper presents a multivariable robust adaptive control scheme for the practical application of aero-engines. The control scheme includes the open-loop controller, the main controller, the bumpless switching controller, and the actuator controller. Considering that the main controller must adapt to the complex working conditions and performance degradation of aero-engines, the multivariable robust model reference adaptive controller based on the augmented Linear Quadratic Gaussian controller, referred to as LQG-MRAC, is proposed to enhance the robustness and adaptability. Besides, a bumpless switching controller is investigated to ensure smooth transferring from the open-loop controller to the main LQG-MRAC controller. Moreover, the actuator and its controller make the designed control system closer to practical application. Finally, four simulation cases considering bumpless switching, control gain, system parameter uncertainty, and different flight envelope points are given to verify the effectiveness and robustness of the proposed control scheme.