Rotor performance characteristics from an aeroacoustic helicopter wind-tunnel test program [PDF]
An investigation of helicopter rotor noise at model scale was conducted in the Langley 4 by 7 meter tunnel. The program described was the first of a planned three-phase project whose purpose was to examine the characteristic noise mechanism involved in ...
Elliott, J. W., Hoad, D. R., Orie, N. M.
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The effects of nonuniform swash-plate stiffness on coupled blade-control system dynamics and stability. Part 2 - Computer program listing [PDF]
Computer program for calculating effects of swash-plate stiffness on helicopter rotor system dynamics and ...
Piarulli, V. J.
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Hingeless helicopter rotor with improved stability [PDF]
, 1976 Improved stability was provided in a hingeless helicopter rotor by inclining the principal elastic flexural axes and coupling pitching of the rotor blade with the lead-lag bending of the blade.
Bousman, W. G. +3 more
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Hover and forward flight acoustics and performance of a small-scale helicopter rotor system [PDF]
A 2.1-m diam., 1/6-scale model helicopter main rotor was tested in hover in the test section of the NASA Ames 40- by 80- Foot Wind Tunnel. Subsequently, it was tested in forward flight in the Ames 7- by 10-Foot Wind Tunnel.
Kitaplioglu, C., Shinoda, P.
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PRESSURE THEORY OF HELICOPTER ROTOR
Advanced Engineering Research, 2011 A new theory of determining the principal aerodynamic characteristics of the propeller is offered.
openaire +2 more sources
An investigation of rotor harmonic noise by the use of small scale wind tunnel models [PDF]
Noise measurements of small scale helicopter rotor models were compared with noise measurements of full scale helicopters to determine what information about the full scale helicopters could be derived from noise measurements of small scale helicopter ...
Schaffer, E. G., Sternfeld, H., Jr.
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Wind tunnel investigations of model rotor noise at low tip speeds [PDF]
Experimental and related analytical results on model rotor rotational and broadband noise obtained in the anechoic wind tunnel and rotor facility are summarized.
Aravamudan, K. S. +2 more
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A laboratory study of the subjective response to helicopter blade-slap noise [PDF]
The test stimuli recorded during a recent field study consisted of 16 sounds, each presented at 4 peak noise levels. Two helicopters and a fixed-wing aircraft were used.
Shepherd, K. P.
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Application of Artificial Neural Networks to a Model of a Helicopter Rotor Blade for Damage Identification in Realistic Load Conditions. [PDF]
Sensors (Basel)Ballarin P +5 more
europepmc +1 more source
A real-time digital computer program for the simulation of a single rotor helicopter [PDF]
A computer program was developed for the study of a single-rotor helicopter on the Langley Research Center real-time digital simulation system. Descriptions of helicopter equations and data, program subroutines (including flow charts and listings), real ...
Gibson, L. H. +2 more
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