Abstract
This paper presents modeling, analysis and simulation evaluations for using main rotor RPM as a substitute control in case of partial failure of main rotor collective control of a Helicopter Uninhabited Aerial Vehicle (Heli-UAV). It is shotin that the use of main rotor RPM variations combined with advanced adaptive control architectures can successfully compensate for partial loss of main rotor collective control. The overall concept is illustrated using simulation results for an example failure scenario. Comparison plots are given to illustrate differences with and without the RPM Control option as well as the nominal flying case. Also, coupling effects of RPM changes on other control channels are illustrated.
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