The emergence of undesired wind-induced hover flight dynamics on lightweight, low-inertia tiltrotor airplanes is outlined, modeled and discussed. Based on real-life flight data of an unmanned tiltrotor vehicle, two re...
详细信息
ISBN:
(数字)9781624106101
ISBN:
(纸本)9781624106101
The emergence of undesired wind-induced hover flight dynamics on lightweight, low-inertia tiltrotor airplanes is outlined, modeled and discussed. Based on real-life flight data of an unmanned tiltrotor vehicle, two repeatable phenomena are examined: directional divergence during a hovering yaw maneuver, and excitation of a diverging lateral-directional oscillation during translational hover, both flown in significant wind with an otherwise proven and stable automaticflightcontrolsystem. Based on a generalizable mathematical model of a hovering tiltrotor airplane with a cascaded attitude and velocity control loop structure, the influence of bare airframe, controlsystem and wind parameters on the lateral-directional hover stability properties of tiltrotor airplanes is examined. To improve stability and control with respect to wind conditions, controlsystem design approaches such as the active coupling with a wind estimator for a model-based dynamic inversion compensator, or the adequate scheduling of feedback gains based on stability conditions derived from a linearized model are discussed and validated in simulation and flight test.
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