Robust LPV H Gain-Scheduled Hover-to-Cruise Conversion for a Tilt-Wing Rotorcraft in the Presence of CG Variations

Dual–Authority Thrust–Vectoring of a Tri–TiltRotor employing Model Predictive Control

“…8d). Around a δv 0 (zero-velocity) region, (23) yields δv δF v m . However, within the near-zero velocity time-zones -marked by red-colored areas in Fig.…”

“…It is noted that the wing integration will be performed onto the main rotor axis, such that the resulting aerial vehicle will be a tilt-wing design [23]. For static stability [24] during longitudinal flight, the combined center of lift of the fixed-wing aircraft must act behind the center of gravity.…”

Modeling and control of a tilt tri-rotor airplane

“…In [4], ongoing works on the development of a quadrotor aerial vehicle having a tilt-wing mechanism using an LQR and a sliding mode controller for the stabilization of the attitude and the altitude are presented via vertical take-off and landing simulations. Other simulation results of the transition to level flight of a tiltwing aircraft which uses a gain-scheduled, multi-variable H ∞ control law are obtained in [7]. More longitudinal dynamic simulation results are found in [6], in which nonlinear approaches are used for the autonomous transition of two vertical/short take-off and landing aircraft (a fixed-wing fighter equipped with a vectored thrust and lift fan and a tilt rotor).…”

Design and construction of a novel quad tilt-wing UAV

“…Among these hybrid designs, tilt-rotor UAVs constitute an attractive research area due to their stability, energy efficiency and controllability [13,14]. A large proportion of the research on these vehicles are on dual tilt-rotors such as Bell Eagle Eye, Smart UAV of KARI and BIROTAN [15] and dual tilt-wings such as HARVee [16] and the UAV of Universita di Bologna. The dual rotor UAVs generally require cyclic control on propellers, which adds to the mechanical complexity, for stabilization and maneuvering.…”