In several studies and on-going developments for advanced rotorcraft, the need for variable/multi-speed capable rotors has been raised. Speed changes of up to 50 percent have been proposed for future rotorcraft to improve vehicle performance. A rotor speed change during operation not only requires a rotor that can perform effectively over the operating speed/load range, but also requires a propulsion system possessing these same capabilities. A study was completed investigating possible drive system arrangements that can accommodate up to a 50 percent speed change. Key drivers were identified from which simplicity and weight were judged as central. This paper presents the current status of two gear train concepts coupled with the first of two clutch types developed and tested thus far with focus on design lessons learned and areas requiring development. Also, a third concept is presented, a dual input planetary differential as leveraged from a simple planetary with fixed carrier.
Concepts for Multi-Speed Rotorcraft Drive System - Status of Design and Testing at NASA GRC
American Helicopter Society (AHS) Annual Forum ; 2015 ; Virginia Beach, VA, United States
2015-05-05
Aufsatz (Konferenz)
Keine Angabe
Englisch
Concepts for Multi-Speed Rotorcraft Drive System - Status of Design and Testing at NASA GRC
British Library Conference Proceedings | 2015
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