Control System Research On The Transition Phase Of Quad Tilt Rotor Aircraft

Quad tilt rotor aircraft, with fixed-wing aircraft and helicopters, can not onlytake off and land vertically, but also have good cruising ability and high flight speed.Because of its four rotors, it has greater load capacity and faster cruising speed. Itwill play a big role in military and civilian aspects in the future. Based on a QuadTilt Rotor model, this paper researches on its control problems in the transitionphase, and mainly focuses on the design and implementation of attitude and altitudecontrol.First, Classical Newtonian mechanics analysis methods are adapted to analyzethe stress on the body. Kinetic equations and kinematic equations can be build up ofhelicopter mode and nacelle tilt mode in transition phase. Mechanical equationparameters are obtained through physical simulation. Transfer function of thebrushless DC motor and steering gear and its drive are obtained throughexperimental methods.Second, a manipulation and control scheme is designed in the transition phaseof Quad tilt rotor aircraft. To meet system performance, attitude and altitude controllaw are designed through the classical control theory and Simulink simulation. Tobe used in digital programming, the transfer function of controller is designed to adiscrete digital controller.Moreover, with ADuc7026controller and MEMS sensors used as the principalhardware, a flight control hardware circuit is designed for the Quad tilt rotor aircraftin the transition phase. To achieve a smooth transition of Quad tilt rotor aircraft, aflight control program in transitional phase is written in the Keil4compilerenvironment, which controls attitude and altitude of the aircraft body.Finally, debug the control system. Data remote control is achieved viaADuCRF101Radio frequency receiver/transmitter modules. With Labview, a PCinterface is written for debugging and monitoring. Through repeated testing, controlparameters are corrected and debugging methods of each channel are summarized.In addition, data and images are gained from the experiments. Ultimately, a smoothtransition of Quad tilt rotor aircraft is achieved.