Robust control method and system of high-speed time-delayed aircraft

Abstract

The invention provides a robust control method and system of a high-speed time-delayed aircraft, and relates to the technical field of automation control. The method comprises the steps of establishing a nonlinear multi-input and multi-output system of input and a state delay according to characteristics of the aircraft; on the basis of the nonlinear multi-input and multi-output system, feeding state variable information of the aircraft back to a nominal controller and a robust compensator; on the basis of the nominal controller, adopting a static feedback control method to process the state variable information to obtain nominal control input; on the basis of the robust compensator, adopting a robust compensation control law to inhibit equivalent interference to obtain robust compensationinput; obtaining control input according to the nominal control input and the robust compensation input, and controlling the aircraft according to the control input. According to the robust control method and system of the high-speed time-delayed aircraft, the influences of diversified interference on the tracking performance of a closed-loop control system of the aircraft can be inhibited simultaneously, and the globally-consistent progressive robust stability and bounded input bounded state robust stability are achieved.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a robust control method and system for a high-speed time-delay aircraft. Background technique [0002] Over the past two decades, high-speed unmanned aerial vehicles have received extensive attention from researchers in the fields of aerospace engineering and flight control as a low-cost and efficient cargo vehicle for entering near space. However, models of high-speed UAVs suffer from nonlinearity, coupling, multiple uncertainties, and time lags in inputs and states. First, high-speed UAVs have a strong coupling between the propulsion system and aerodynamics compared to traditional flying vehicles, and the models are highly nonlinear. Second, the dynamics of high-speed UAVs involves multiple uncertainties, including parameter uncertainties, unmodeled dynamics, and external disturbances, which will seriously affect the flight performance of the vehicle. Finally, there...

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Problems solved by technology

However, the uncertainty and time-delay effects of the closed-loop control system are not further discussed in the stability analysis

Fiorentini et al. designed a robust controller based on an adaptive control method to suppress the influence of parameter uncertainty and coupled dynamics on the control system, but the dynamic tracking performance cannot be determined with an adaptive-based control method

For high-speed UAV systems, the robust control problem is complex due to nonlinearities and uncertainties

Furthermore, the control problem becomes more difficult if state and input time-lags are involved in the vehicle dynamics

Sharma et al. considered the state or input time-delays of single-input single-output (SISO) systems and analyzed their stability, but did not discuss the coupled dynamics further

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