Results 271 to 280 of about 7,767,476 (330)
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IEEE Transactions on Magnetics, 2018
This paper proposes and analyzes the design philosophies of the single-phase main exciter (ME) for an aircraft wound-rotor synchronous machine and investigates its operating characteristics in both generating and starting modes. The fundamental structure
Jincai Li +4 more
semanticscholar +3 more sources
This paper proposes and analyzes the design philosophies of the single-phase main exciter (ME) for an aircraft wound-rotor synchronous machine and investigates its operating characteristics in both generating and starting modes. The fundamental structure
Jincai Li +4 more
semanticscholar +3 more sources
IEEE Transactions on Aerospace and Electronic Systems, 2017
S. T. Nguyen +3 more
semanticscholar +3 more sources
S. T. Nguyen +3 more
semanticscholar +3 more sources
Helicopter Main-Rotor/Tail-Rotor Interaction
Journal of the American Helicopter Society, 2000Preliminary results from a study to model the interaction aerodynamics and aeroacoustics of the main and tail rotor of a helicopter in subsonic flow are presented. The configurations studied are: 1) two bladed main and tail rotors in hover, and 2) a four-bladed main rotor and two-bladed tail rotor in climbing flight.
Yin, J., Ahmed, S.R.
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Aerodynamics and aeroacoustics of helicopter main-rotor/tail-rotor interaction
5th AIAA/CEAS Aeroacoustics Conference and Exhibit, 1999Preliminary results from an ongoing effort to model the interaction aerodynamics and aeroacoustics of main- and tail rotor of a helicopter in subsonic flow are presented. The configurations studied are a) a two-blade main- and tail rotor in hover, and b) a four-blade main- and a two-blade tail rotor in climb flight.
Ahmed, S.R., Yin, J.
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Titanium UTTAS Main Rotor Blade
Journal of the American Helicopter Society, 1976A description of the design philosophy leading to the development of a high performance rotor blade for the Army UTTAS helicopter is presented. The Army mission requirements of 550 fpm rate‐of‐climb at 4000 ft, 95° conditions and a 1.75 g maneuver at 150 knots translate into Figure of Merit and aeroelastic achievements beyond those of existing rotors.
Peter Arcidiacono, Robert Zincone
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Using Redundant Effectors to Trim a Compound Helicopter with Damaged Main Rotor Controls
Proceedings of the Vertical Flight Society 73rd Annual Forum, 2017Control of a helicopter's main rotor is typically accomplished through use of three hydraulic actuators that act on the non-rotating swashplate and position it to achieve any combination of collective and cyclic blade pitch.
Jean-Paul F. Reddinger, F. Gandhi
semanticscholar +1 more source
Main Rotor Gearbox Oil Cooling System Design
Proceedings of the Vertical Flight Society 79th Annual Forum, 2023This paper details the design process for a Main Rotor Gearbox Oil Cooling System and recommends techniques to optimise future designs. It covers the drive methods which must be considered in the design, along with the optimum heat exchanger and airflow path arrangements to meet the design requirements.
David Gore, John Kerr
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1992
Abstract The 4340 steel main rotor yoke of a helicopter failed during a hovering exercise. Visual examination of the yoke revealed no evidence of gross external damage. Visual fracture surface examination, macrofractography, scanning electron micrography, and metallography of a section cut from the yoke in the region of the cracking ...
S.R. Lamb, G. Clerk
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Abstract The 4340 steel main rotor yoke of a helicopter failed during a hovering exercise. Visual examination of the yoke revealed no evidence of gross external damage. Visual fracture surface examination, macrofractography, scanning electron micrography, and metallography of a section cut from the yoke in the region of the cracking ...
S.R. Lamb, G. Clerk
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Rigidochromic conjugated polymers carrying main-chain molecular rotors
Chemical Communications, 2019We design and prepare rigidochromic conjugated polymers that carry molecular rotors in the main chain. We show how a suitable design maintains the mechanosensitivity of the rotors upon incorporation into an extended π-conjugated system.
Van Der Scheer, Pieter +2 more
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Tri-quadrotor with main and secondary rotor
2020 Chinese Automation Congress (CAC), 2020Multi-rotor aircrafts were widely used in military and civilian fields. However, the development of multirotor aircraft was limited by power and endurance time. In order to improve these problems, this paper focused on the flight module with one main rotor and three secondary rotors under the triangular frame, which can form the Unmanned Aerial Vehicle
Wei Dong, Qi Gao, Feng Pan
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