Research On Carrier-based Aircraft "Magic Carpet" Landing Technology

The following control problems exist during carrier-based landings: low dynamic pressure stable flight control issues,deck tracking and ship wake suppression problems,and maneuvering coupling problems during the landing phase.In order to solve the control problem of the carrier-based aircraft during the landing phase,the control system of the flight path rate control mode and delta flight path control mode was designed by referring to the American "Magic Carpet" control system and analyzing its key technical mechanism.Firstly,the nonlinear model of the carrier-based aircraft and the landing environment are modeled,and the dynamic characteristics of the carrier-based aircraft model are analyzed.The conventional landing control system is designed for the landing phase,and the ship wake and deck motion disturbance are introduced for simulation analysis.The simulation results show that the effects of suppressing ship wake and tracking deck movement are not ideal.Therefore,the "Magic Carpet" landing technology is introduced,and four key technologies of "magic carpet" are analyzed,including integrated direct lift control,flight path rate command,delta flight path command,and improved head-up display.Secondly,the key control technology of "Magic Carpet" is designed.In order to improve the controller’s ability to suppress airflow disturbances and trajectory tracking capabilities,the flight path rate control mode and the delta flight path control mode are designed for the carrier-based aircraft landing stage.The design of flight path rate control mode adopts the combination of DLC and flight path angle hold,and the flight path rate is directly controlled by the direct lift surface.The control structure greatly improves the flight path response bandwidth.The delta flight path control mode is based on the inner-loop flight path rate control,which adds delta flight path control and improves the pilot’s control level.The simulation results show that the two control modes have better ability of restraining the disturbance of the wake and tracking the deck motion than the conventional control strategy,and the track tracking response is faster.Finally,in view of the conflict between the fastness and overshoot of the classic PID in the controller,the ADRC is used instead of PID to design two control modes.The research shows that the controller based on ADRC can well resolve the contradiction between fastness and overshoot,which is beneficial to the safe and accurate landing of carrier-based aircraft.