Results 241 to 250 of about 63,753 (279)
Some of the next articles are maybe not open access.
Orthogonal Blade-Vortex Interaction on a Helicopter Tail Rotor
AIAA Journal, 2008The orthogonal blade-vortex interaction has been simulated using unsteady Reynolds-averaged Navier-Stokes equations with turbulence closure equations. The cases investigated are relative to an interaction between a lifting blade at a high angle of attack and an orthogonal vortex that travels either head-on or at 45 deg to the leading edge.
Filippone, Antonio, Afgan, Imran
openaire +2 more sources
Prediction of Main Rotor, Tail Rotor and Engine Parameters from Flight Tests
49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference <br> 16th AIAA/ASME/AHS Adaptive Structures Conference<br> 10t, 2008In the framework of this research project, the main rotor torque, tail rotor torque, engine torque and main rotor speed of a helicopter in forward flight are estimated by using a state space model from flight tests data. The state space model inputs are nonlinear terms made of combinations of pilot controls and helicopter states.
Michel Nadeau Beaulieu, Ruxandra Botez
openaire +1 more source
Rotor Wake Study Near the Horizontal Tail of a T-Tail Configuration
Journal of Aircraft, 2002Development of advanced rotorcraft configurations has highlighted a need for high-quality experimental data to support the development of robust and accurate analytical design tools. To provide high-quality experimental data, a test program was conducted in the NASA Langley Research Center 14- by 22-Foot Subsonic Tunnel to measure the flow near the ...
Susan Althoff Gorton +3 more
openaire +1 more source
Design parameters improvement of helicopter ducted tail rotor
Aircraft Engineering and Aerospace Technology, 2018Purpose The purpose of this paper is to reduce the acoustic noise of helicopter ducted tail rotor. Design/methodology/approach To predict the noise accurately, a thin-body boundary element method (BEM)/Ffowcs Williams–Hawkings method is developed in this paper.
Guo Zhong, Jun Huang, Mingxu Yi
openaire +1 more source
A Comparative Study of Tail Rotor Noise Mechanisms
Journal of the American Helicopter Society, 1986A study was made of helicopter tail rotor noise, particularly that due to interactions with the wakes of the main rotor, hub, and fuselage, and with the engine exhaust. Both harmonic and broadband noise were analyzed. The disturbed flow into the tail rotor was modeled using combinations of aerodynamic and acoustic flow codes along with some necessary ...
A. R. George, S. ‐T. Chou
openaire +1 more source
S-76D™ Tail Rotor Ice Impact Test
SAE Technical Paper Series, 2011<div class="section abstract"><div class="htmlview paragraph">This paper presents the test method and results from ice impact testing conducted on representative S-76D™ Helicopter Tail Rotor (TR) blade and TR control system assemblies. Full scale ice impact tests on the leading edge of the tail rotor blade paddle, pitch links, and a pitch ...
openaire +1 more source
Elastic Pitch Beam Tail Rotor Operational Suitability Investigation
1974Abstract : Work was performed to ascertain the operational suitability of the 6Elastic Pitch Beam Tail Rotor6 and to select an optimized coating system and leading edge erosion guard. The five basic tasks performed are the following: (1) protective coating for the glass reinforced plastic spar (GRP). (2) Elastic pitch beam spring rate.
Paul Maloney +2 more
openaire +1 more source
Numerical investigation and optimization for interior duct shape of ducted tail rotor
Aerospace Science and Technology, 2021Chenkai Cao, Qijun Zhao
exaly
Solid Lubricants for Helicopter Tail Rotor Gearboxes
1970Abstract : Solid lubricants as retainers in rolling bearings and as idlers for load gearswere evaluated in a Bell UH-1 helicopter tail rotor drive gearbox under normallubricated conditions and also under emergency conditions of dry operation.Solid lubricants provided satisfactory gearbox operation using conventionalfluid lubrication in all tests at ...
openaire +1 more source
Aeroacoustic investigation of a ducted tail rotor
AIAA AVIATION 2023 Forum, 2023Prateek Jaiswal +4 more
openaire +1 more source