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Research on the Control Problems of Tiltrotor Aircraft

Author: XuZuo
Tutor: LuoJing
School: Harbin Institute of Technology
Course: Control Science and Engineering
Keywords: Tiltrotor MRAC Brushless DC Motor
CLC: V249.1
Type: Master's thesis
Year: 2011
Downloads: 131
Quote: 0
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Abstract


Is a tiltrotor aircraft with both helicopters and fixed-wing aircraft advantages of the new aircraft, which aircraft can be in a small space like the same VTOL helicopter , fixed-wing aircraft that can be as high-speed cruise flight distance . The vehicle is a multi- input multi-output nonlinear time-varying systems , flight control problem is very complicated. It is because of this aircraft with excellent performance, technical difficulties, so its development by the national attention. In the aerospace field , many charged objects are time-varying systems , in general , use of engineering controls are classical control theory , but when the controlled object parameter variation is large, the PID control parameters achieved by switching the aircraft attitude control . In this paper, the model reference adaptive control method to achieve a change in the nacelle angle vertical posture for flight control . This method does not require switching control rate , also achieve a better control effect. This article is derived tiltrotor VTOL phase transition phase and a mechanical model , the design of vertical takeoff and landing phase control strategy, through one kind of differential approach to achieve the vertical takeoff and landing phases horizontal and vertical channels individually controlled. Applying the classical control theory roll angle channel simulation analysis . Brushless DC motor speed controller is the focus of this research , the choice of EMF to the motor rotor position detection, through debugging and calculated the optimal commutation of the motor moment , no sense of brushless motor to achieve a stable high-speed operation . Finally , the subject produced a tiltrotor aircraft mock , no sense of using gyroscopes and brushless motors and the microprocessor through a large number of experiments, basically realized tiltrotor VTOL attitude control .

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CLC: > Aviation, aerospace > Aviation > Aircraft instrumentation,avionics, flight control and navigation > Flight control system and navigation > Flight control
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