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Meeting	ACGS Committee Meeting 97 - Tahoe - March 2006
Agenda Location	9 SUBCOMMITTEE A - AERONAUTIC AND SURFACE VEHICLES 9.4 Torque Limit Cueing via Rotorcraft Collective
Title	Torque Limit Cueing via Rotorcraft Collective
Presenter	Vineet Sahasrabudhe
Affiliation	Sikorsky
Available Downloads*	presentation
	Downloads are available to members who are logged in and either Active* or attended this meeting.
Abstract	A collective axis cueing system has been developed for helicopters that cues the pilot to a variety of envelope limits associated with the engine and drive systems including transient and continuous transmission torque limits, rotor RPM limits, and the optimal RPM following an OEI emergency. The cueing system uses neural network and linear model based algorithms to predict approaching limits and then estimates the constraints on the collective control position to ensure that the limits are not exceeded. The constraints are relayed to the pilot through a combination of soft stop and stick shaker cues. This collective cueing system has been tested using a real-time piloted simulation of a UH-60 Black Hawk. The results of the simulation show that collective cueing leads to a significant reduction in pilot workload, decreases time required to conduct a specific task, and improves task accuracy for aggressive maneuvers. In addition, it allows the pilot to fly in true “heads up, out-the-window” fashion following a single engine failure. Finally, the study shows that with the judicious use of different types of cues (soft stops and stick shakers) and intuitively chosen stick shaker frequencies, multiple limits can be cued through the collective without confusion.