Performance Data from a Wind-Tunnel Test of Two Main-rotor Blade Designs for a Utility-Class Helicopter [PDF]
An investigation was conducted in the NASA Langley Transonic Dynamics Tunnel to evaluate an advanced main rotor designed for use on a utility class helicopter, specifically the U.S. Army UH-60A Blackhawk.
Singleton, Jeffrey D. +2 more
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The use of active controls to augment rotor/fuselage stability [PDF]
, 1985 The use of active blade pitch control to increase helicopter rotor/body damping is studied. Control is introduced through a conventional nonrotating swashplate. State variable feedback of rotor and body states is used.
Straub, F. K., Warmbrodt, W.
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Tiltrotor CFD part II: aerodynamic optimisation of tiltrotor blades [PDF]
, 2017 This paper presents aerodynamic optimisation of tiltrotor blades with high-fidelity computational fluid dynamics. The employed optimisation framework is based on a quasi-Newton method, and the required high-fidelity flow gradients were computed using a
Barakos, G.N. +5 more
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A simulation study of active feedback supression of dynamic response in helicopter rotor blades [PDF]
A parameter study is presented for active feedback control applied to a helicopter rotor blade during forward flight. The study was performed on an electromechanical apparatus which included a mechanical model rotor blade and electronic analog simulation
Bessey, R. L., Dodge, F. T., Kana, D. D.
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Jixie chuandong, 2017 The torsional vibration dynamics analytical model of rotor power transmission system is built,the shimmy collectivity mode of vibration and frequency of rotor blade are obtained,it is indicated that the propulsion/transmission system will influence ...
Lai Lingyun, Zhang Ruochen, Liu Yongzhi
doaj
Calculated Hovering Helicopter Flight Dynamics with a Circulation Controlled Rotor [PDF]
The influence of the rotor blowing coefficient on the calculated roots of the longitudinal and lateral motion was examined for a range of values of the rotor lift and the blade flap frequency.
Chopra, I., Johnson, W.
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A flight investigation of blade section aerodynamics for a helicopter main rotor having NLR-1T airfoil sections [PDF]
A flight investigation was conducted using a teetering-rotor AH-1G helicopter to obtain data on the aerodynamic behavior of main-rotor blades with the NLR-1T blade section.
Morris, C. E. K., Jr. +2 more
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Smart actuation for helicopter rotorblades [PDF]
, 2012 Successful rotorcrafts were only achieved when the differences between hovering flight conditions and a stable forward flight were understood. During hovering, the air speed on all helicopter blades is linearly distributed along each blade and is the ...
Akkerman, Remko +6 more
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Model helicopter rotor high-speed impulsive noise: Measured acoustics and blade pressures [PDF]
A 1/17-scale research model of the AH-1 series helicopter main rotor was tested. Model-rotor acoustic and simultaneous blade pressure data were recorded at high speeds where full-scale helicopter high-speed impulsive noise levels are known to be dominant.
Boxwell, D. A. +3 more
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Lift distribution and velocity field measurements for a three-dimensional, steady blade/vortex interaction [PDF]
A wind tunnel experiment simulating a steady three-dimensional helicopter rotor blade/vortex interaction is reported. The experimental configuration consisted of a vertical semispan vortex-generating wing, mounted upstream of a horizontal semispan rotor ...
Dunagan, Stephen E., Norman, Thomas R.
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