| Citation: | YU Xin, CHEN Renliang. Optimal control of tilt rotor aircraft based on gain scheduling and smooth switching[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(6): 1186-1198. doi: 10.13700/j.bh.1001-5965.2020.0176(in Chinese)
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In view of the complex control problem caused by variable mechanical characteristics in conversion maneuver of tilt rotor aircraft, the control synthesis architecture that combines linear quadratic optimal control based on Gain Scheduling (GS) and smooth switching control is proposed to realize global optimal control in conversion maneuver. This control synthesis method alleviates the load of the operating mechanism while guaranteeing the minimum performance index. First, the high-precision flight dynamics model of tilt rotor aircraft was established, and the control redundancy was overcome by mixed control model. Then, a linear quadratic optimal multi-loop controller based on gain scheduling was designed, and two sets of controllers were synthesized by using smooth switching control strategy to realize the smooth transition of attitude in the conversion maneuver. Finally, the full-modes autonomous flight simulation was carried out, which had the desired trajectory of the middle tilting corridor. The simulation results show that the control system has strong robustness and better system performance in the process of conversion maneuver.
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