Results 301 to 310 of about 172,189 (335)
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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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The Effects of Rotor-Rotor and Rotor-Wing Interactions on eVTOL Aeroacoustics
Proceedings of the Vertical Flight Society 79th Annual Forum, 2023This study examines the effect of aerodynamic interactions on a two-rotor pair in cruise, and a propeller acting in the presence of a wing. The two-rotor system with a forward and an aft rotor in-line is considered at different disk loadings (6, 8, 12 lb/ft² for a fixed cruise speed and different cruise speeds (20, 40, 60 knots) for a fixed ...
Brendan Smith, Ullhas Hebbar, Dr. Gandhi
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Current Protocols in Molecular Biology, 1996
AbstractThis appendix presents useful basic information, including common abbreviations, useful measurements and data, characteristics of amino acids and nucleic acids, information on radioactivity and the safe use of radioisotopes and other hazardous chemicals, conversions for centrifuges and rotors, characteristics of common detergents, and common ...
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AbstractThis appendix presents useful basic information, including common abbreviations, useful measurements and data, characteristics of amino acids and nucleic acids, information on radioactivity and the safe use of radioisotopes and other hazardous chemicals, conversions for centrifuges and rotors, characteristics of common detergents, and common ...
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Chemical Reviews, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Gregg S, Kottas +3 more
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AbstractFor Abstract see ChemInform Abstract in Full Text.
Gregg S, Kottas +3 more
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Physical Review E, 2005
Transport properties in the relativistic analog of the periodically kicked rotor are contrasted under classically and quantum mechanical dynamics. The quantum rotor is treated by solving the Dirac equation in the presence of the time-periodic delta-function potential resulting in a relativistic quantum mapping describing the evolution of the wave ...
D U, Matrasulov +3 more
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Transport properties in the relativistic analog of the periodically kicked rotor are contrasted under classically and quantum mechanical dynamics. The quantum rotor is treated by solving the Dirac equation in the presence of the time-periodic delta-function potential resulting in a relativistic quantum mapping describing the evolution of the wave ...
D U, Matrasulov +3 more
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Impact of Rotor-Rotor and Rotor-Body Aerodynamic Interactions on Quadrotor Vehicle Performance
Proceedings of the Vertical Flight Society 79th Annual Forum, 2023Rotor-rotor and rotor-body interactions can have a first-order impact on multirotor vehicle performance. Identification of these performance impacts has previously been limited to numerical analysis and controlled environment testing, and they are largely unknown for full-scale multirotor flight vehicles. To capture these interactional effects,
Abraham Atte +4 more
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Entry Technology Conference, 1964
Autorotating rotors can, in a single configuration system, provide the capability for retardation, stabilization, drag force modulation, glide at useful L/D ratios, maneuvering and control during descent, and low-velocity touchdown. A given configuration will deploy over a wide range of speeds and dynamic pressures.
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Autorotating rotors can, in a single configuration system, provide the capability for retardation, stabilization, drag force modulation, glide at useful L/D ratios, maneuvering and control during descent, and low-velocity touchdown. A given configuration will deploy over a wide range of speeds and dynamic pressures.
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Solid-Rotor and Composite-Rotor Induction Machines
IEEE Transactions on Aerospace and Electronic Systems, 1972The feasibility of constructing composite rotors in the laboratory for use on a 60- to 120-Hz supply has been established and the experimental results with such rotors have been published for the first time. Results obtained from the tests made on a three-phase induction motor with different solid-iron as well as composite rotors are presented.
Mulukutla Sarma, Gorakh Soni
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Rotation–libration and rotor–rotor coupling in 4-methylpyridine
The Journal of Chemical Physics, 2004The low temperature rotational dynamics of methyl groups in 4-methylpyridine is analyzed in terms of a model potential including rotation–libration and rotor–rotor coupling. The parameters of the model potential are adjusted by comparison of calculated with published and newly recorded inelastic neutron scattering spectra.
M A, Neumann +3 more
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Journal of Sound and Vibration, 1966
Abstract The use of a wing to unload the helicopter rotor is discussed for the cases with and without auxiliary propulsion. Data are presented from the flight test of five wing-rotor combinations showing the effects of the wing on the performance, stability and control, structural loads and maneuver characteristics of the machines.
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Abstract The use of a wing to unload the helicopter rotor is discussed for the cases with and without auxiliary propulsion. Data are presented from the flight test of five wing-rotor combinations showing the effects of the wing on the performance, stability and control, structural loads and maneuver characteristics of the machines.
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