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Rotors (Helicopters) -- Noise

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• Rotors (Helicopters)
• Helicopters -- Noise
• Noise

• Rotors (Helicopters) -- Noise -- Computer programs
• Rotors (Helicopters) -- Noise -- Computer simulation
• Rotors (Helicopters) -- Noise -- Mathematical models
• Rotors (Helicopters) -- Noise -- Testing

• Advancing-side directivity and retreating-side interactions of model rotor blade-vortex interaction noise (National Aeronautics and Space Administration, Scientific and Technical Information Division ;, 1988), by R. M. Martin and Langley Research Center (page images at HathiTrust)
• Helicopter main-rotor noise : determination of source contributions using scaled model data (National Aeronautics and Space Administration, Scientific and Technical Information Division ;, 1988), by Thomas F. Brooks, Michael A. Marcolini, J. Ralph Jolly, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division (page images at HathiTrust)
• Wake geometry effects on rotor blade-vortex interaction noise directivity (National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ;, 1990), by R. M. Martin and Langley Research Center (page images at HathiTrust)
• Helicopter blade-vortex interaction locations : scale-model acoustics and free-wake analysis results (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1987), by Danny R. Hoad and United States. Army Aviation Research and Technology Activity. Aerostructures Directorate (page images at HathiTrust)
• Correlation of helicopter impulsive noise from blade-vortex interaction with rotor mean inflow (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1987), by Andrew B. Connor, R. M. Martin, and Langley Research Center (page images at HathiTrust)
• Investigation of blade impulsive noise on a scaled fully articulated rotor system (National Aeronautics and Space Administration ;, 1977), by James Scheiman, Danny R. Hoad, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• A computer program to predict rotor rotational noise of a stationary rotor from blade loading coefficients (U.S. National Aeronautics and Space Administration ;, 1976), by Ramani Ramakrishnan, Robert N. Hosier, Donald Randall, and Langley Research Center (page images at HathiTrust)
• Design and preliminary tests of a blade tip air mass injection system for vortex modification and possible noise reduction on a full-scale helicopter rotor (National Aeronautics and Space Administration ;, 1975), by Robert J. Pegg and Langley Research Center (page images at HathiTrust)
• Determination of rotor harmonic blade loads from acoustic measurements (National Aeronautics and Space Administration ;, 1975), by Peter K. Kasper, U.S. Army Air Mobility Research and Development Laboratory, Langley Research Center, and Wyle Laboratories (page images at HathiTrust)
• Prediction of rotating-blade vortex noise from noise of nonrotating blades (United States National Aeronautics and Space Administration ;, 1976), by Martin R. Fink, Roy K. Amiet, Robert H. Schlinker, United States National Aeronautics and Space Administration, Langley Research Center, and United Technologies Research Center (page images at HathiTrust)
• Source mechanisms for rotor noise radiation (National Aeronautics and Space Administration ;, 1973), by M. V. Lowson, C. E. Whitfield, A. R. Whatmore, Langley Research Center, and Loughborough University of Technology (page images at HathiTrust)
• Noise of a model helicopter rotor due to ingestion of turbulence (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1979), by Robert W. Paterson, Roy K. Amiet, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Evaluation of the annoyance due to helicopter rotor noise (National Aeronautics and Space Administration, Scientific and Technical Information Office ;, 1978), by Harry Sternfeld, Linda Bukowski Doyle, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Blade-mounted trailing edge flap control for BVI noise reduction (National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992), by A. A. Hassan, Langley Research Center, and McDonnell Douglas Helicopter Company (page images at HathiTrust)
• Research investigation of helicopter main rotor/tail rotor interaction noise (National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988), by J. Fitzgerald, F. Kohlhepp, and Lewis Research Center (page images at HathiTrust)
• Further analysis of broadband noise measurements for a rotating blade operating with and without its shed wake blown downstream (National Aeronautics and Space Administration ;, 1974), by James Scheiman and Langley Research Center (page images at HathiTrust)
• Helicopter rotor rotational noise predictions based on measured high-frequency blade loads (National Aeronautics and Space Administration ;, 1974), by Robert N. Hosier, Ramani Ramakrishnan, and Langley Research Center (page images at HathiTrust)
• Noise characteristics of eight helicopters (Dept. of Transportation, Federal Aviation Administration, Systems Research & Development Service ;, 1977), by Harold C. True, Transportation Systems Center, and United States. Federal Aviation Administration. Systems Research and Development Service (page images at HathiTrust)

• A Computer Program for the Determination of the Acoustic Pressure Signature of Helicopter Rotors Due to Blade Thickness (NASA Technical Memorandum X-3323; 1976), by Gerald H. Mall, F. Farassat, and Langley Research Center (page images at HathiTrust)

• Computer program incorporating realistic blade motions and advanced acoustic formulations. (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1986), by Kenneth S. Brentner and Langley Research Center (page images at HathiTrust)
• The effect of helicopter main rotor blade phasing and spacing on performance, blade loads, and acoustics (National Aeronautics and Space Administration ;, 1976), by Santu T. Gangwani, Systems Research Laboratories. Rasa Division, and United States National Aeronautics and Space Administration (page images at HathiTrust)

• Power cepstrum technique with application to model helicopter acoustic data (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1986), by R. M. Martin, C. L. Burley, and Langley Research Center (page images at HathiTrust)
• Theory of noise generation from moving bodies with an application to helicopter rotors (National Aeronautics and Space Administration ;, 1975), by F. Farassat and Langley Research Center (page images at HathiTrust)

• Helicopter rotor trailing edge noise (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1981), by Robert H. Schlinker, Roy K. Amiet, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, and Langley Research Center (page images at HathiTrust)
• NASA TN D-6101 (National Aeronautics and Space Administration ;, 1970), by James Scheiman, James P. Shivers, Langley Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust; US access only)

Items below (if any) are from related and broader terms.

• US Army helicopter design datcom (Army Aviation Systems Command, 1976), by L. U. Dadone, U.S. Army Air Mobility Research and Development Laboratory. Systems Research Integration Office, and Boeing Vertol Company (page images at HathiTrust; US access only)
• Computed induced velocity, induced drag, and angle of attack distributions for a two-bladed rotor ([Buffalo?, 1963), by Raymond A. Piziali and Frank A. DuWaldt (page images at HathiTrust)
• Vibration characteristics of OH-58A helicopter main rotor transmission (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1987), by David G. Lewicki, John J. Coy, United States. Army Aviation Research and Technology Activity. Propulsion Directorate, and Lewis Research Center (page images at HathiTrust)
• Transonic flow analysis for rotors. Part 3, Three-dimensional, quasi-steady, Euler calculation (National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ;, 1990), by I-Chung Chang and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division (page images at HathiTrust)
• Results of the first complete static calibration of the RSRA rotor-load-measurement system (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1984), by C. W. Acree and Ames Research Center (page images at HathiTrust)
• An assessment of the capability to calculate tilting prop-rotor aircraft performance, loads, and stability (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1984), by Wayne Johnson and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• An experimental investigation of the flap-lag-torsion aeroelastic stability of a small-scale hingeless helicopter rotor in hover (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1986), by David L. Sharpe, United States. Army Aviation Research and Technology Activity. Aeroflightdynamics Directorate, and Ames Research Center (page images at HathiTrust)
• Compressible, unsteady lifting-surface theory for a helicopter rotor in forward flight (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1985), by Harry L. Runyan, H. Tai, and Langley Research Center (page images at HathiTrust)
• Preliminary rotor wake measurements with a laser velocimeter (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1983), by Danny R. Hoad, David B. Rhodes, James F. Meyers, Army Research and Technology Laboratories (U.S.). Structures Laboratory, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• A tabulation of helicopter rotor-blade differential pressures, stresses, and motions as measured in flight (National Aeronautics and Space Administration, 1964), by James Scheiman, United States National Aeronautics and Space Administration, and Langley Research Center (page images at HathiTrust)
• Reduction of high-speed impulsive noise by blade planform modification of a model helicopter rotor (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1982), by David A. Conner, Danny R. Hoad, Army Research and Technology Laboratories (U.S.). Structures Laboratory, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Experimental investigation of effects of blade tip geometry on loads and performance for an articulated rotor system (National Aeronautics and Space Administration, Scientific and Technical Information Office ;, 1979), by William H. Weller, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office, and Army Research and Technology Laboratories (U.S.). Structures Laboratory (page images at HathiTrust)
• A rotor-mounted digital instrumentation system for helicopter blade flight research measurements (National Aeronautics and Space Administration, Scientific and Technical Information Office ;, 1978), by Vernie H. Knight, Milton L. Williams, William S. Haywood, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Loads and performance data from a wind-tunnel test of model articulated helicopter rotors with two different blade torsional stiffnesses (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1983), by William T. Yeager, Wayne R. Mantay, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Numerical analysis of the first static calibration of the RSRA helicopter active-isolator rotor balance system (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1985), by C. W. Acree and Ames Research Center (page images at HathiTrust)
• Effect of planform taper on hover performance of an advanced AH-64 model rotor (National Aeronautics and Space Administration, Scientific and Technical Information Office, 1987), by Henry L. Kelley, United States. Army Aviation Research and Technology Activity, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Acoustic measurements of the X-wing rotor (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1983), by M. Mosher and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Experimental investigation of three helicopter rotor airfoils designed analytically (National Aeronautics and Space Administration, Scientific and Technical Information Office ;, 1979), by Gene J. Bingham, Kevin W. Noonan, Army Research and Technology Laboratories (U.S.). Structures Laboratory, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Effects of repetition rate and impulsiveness of simulated helicopter rotor noise on annoyance (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1982), by Clemans A. Powell, David A. McCurdy, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Rotor tip clearance effects on overall and blade-element performance of axial-flow transonic fan stage (National Aeronautics and Space Administation, Scientific and Technical Information Branch ;, 1982), by Royce D. Moore and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• NASA CR-1440 (National Aeronautics and Space Administration ;, 1969), by Anton J. Landgrebe, Langley Research Center, United Aircraft Corporation, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• NASA CR-1441 (National Aeronautics and Space Administration ;, 1969), by Anton J. Landgrebe, Langley Research Center, United Aircraft Corporation, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Analytical investigation of the effects of blade flexibility, unsteady aerodynamics, and variable inflow on helicopter rotor stall characteristics (National Aeronautics and Space Administration, 1971), by E. D. Bellnger, United States National Aeronautics and Space Administration, United Aircraft Corporation. Research Laboratories, and Langley Research Center (page images at HathiTrust)
• Estimating rotary wing performance ... (National Aeronautics and Space Administration, 1964), by Watson H. Tanner, United Aircraft Corporation, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• NASA CR-1845 (National Aeronautics and Space Administration ;, 1971), by J. G. Hicks, J. F. Nash, Lockheed-Georgia Company, United States National Aeronautics and Space Administration, and Ames Research Center (page images at HathiTrust)
• Experimental study of rotor unsteady airloads due to blade-vortex interaction (National Aeronautics and Space Administration, 1971), by Raghuveera Padakannaya, United States National Aeronautics and Space Administration, Langley Research Center, and Pennsylvania State University (page images at HathiTrust)
• The effects of nonuniform swash-plate stiffness on coupled blade-control system dynamics and stability : Part 1. Analysis and application (National Aeronautics and Space Administration, 1971), by Vincent James Piarulli, United States National Aeronautics and Space Administration, Langley Research Center, and Rochester Applied Sciences Associates (page images at HathiTrust)
• A method for analyzing the aeroelastic stability of a helicopter rotor in forward flight (National Aeronautics and Space Administration ;, 1969), by Peter Crimi, Applied Science Associates, and Langley Research Center (page images at HathiTrust)
• Two-dimensional wind tunnel test of an oscillating rotor airfoil, volume II (National Aeronautics and Space Administration, Scientific and Technical Information Office ;, 1977), by L. U. Dadone, Boeing Vertol Company, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Hover performance tests of full scale variable geometry rotors (U.S. National Aeronautics and Space Administration ;, 1976), by James B. Rorke, United States National Aeronautics and Space Administration, Langley Research Center, United Technologies Corporation, and U.S. Army Air Mobility Research and Development Laboratory (page images at HathiTrust)
• An experimental study of rotor blade-vortex interaction (National Aeronautics and Space Administration, 1970), by Makam Surendraiah, United States National Aeronautics and Space Administration, Langley Research Center, and Pennsylvania State University (page images at HathiTrust)
• NASA CR-1577 (National Aeronautics and Space Administration ;, 1970), by Vincent James Piarulli, Richard P. White, United States National Aeronautics and Space Administration, Langley Research Center, and Rochester Applied Sciences Associates (page images at HathiTrust)
• Analysis and correlation of test data from an advanced technology rotor system (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1983), by D. Jepson, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, Ames Research Center, and United Technologies Corporation (page images at HathiTrust)
• Coupled rotor/airframe vibration analysis (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1982), by Robert Sopher, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, United Technologies Corporation. Sikorsky Aircraft Division, Army Research and Technology Laboratories (U.S.). Structures Laboratory, and Langley Research Center (page images at HathiTrust)
• Rotorcraft blade mode damping identification from random responses using a recursive maximum likelihood algorithm (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1982), by John A. Molusis, Army Research and Technology Laboratories (U.S.). Structures Laboratory, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, and Langley Research Center (page images at HathiTrust)
• Helicopter vibration suppression using simple pendulum absorbers on the rotor blade (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1982), by G. Alvin Pierce, M-Nabil H. Hamouda, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, and Langley Research Center (page images at HathiTrust)
• An unsteady helicopter rotor : fuselage interaction analysis (National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988), by Peter F. Lorber, T. Alan Egolf, United States. Army Aerostructures Directorate, and Langley Research Center (page images at HathiTrust)
• Helicopter rotor blade design for minimum vibration (National Aeronautics and Space Administration, Scientific and Technical Information Branch ;, 1984), by Robert B. Taylor, United Technologies Research Center, Aeromechanics Laboratory, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch (page images at HathiTrust)
• Experimental smoke and electromagnetic analog study of induced flow field about a model rotor in steady flight within ground effect (National Aeronautics and Space Administration :, 1960), by Robin B. Gray and Lewis Research Center (page images at HathiTrust)
• Stability of elastic bending and torsion of uniform cantilever rotor blades in hover with variable structural coupling (National Aeronautics and Space Administration ;, 1976), by Dewey H. Hodges, Robert A. Ormiston, Ames Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• NASA TN D-5410 (National Aeronautics and Space Administration ;, 1969), by John F. Ward, Langley Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• Flight measurements of the effects of blade out of track on the vibration levels on a tandem rotor helicopter (National Aeronautics and Space Administration, 1960), by United States National Aeronautics and Space Administration and Langley Research Center (page images at HathiTrust)
• Effect of casing treatment on overall and blade-element performance of a compressor rotor (National Aeronautics and Space Administration ;, 1971), by Royce D. Moore, Robert J. Blade, George Kovich, Ames Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust)
• NASA TN D-3936 (National Aeronautics and Space Administration :, 1967), by James Scheiman, Henry L. Kelley, and United States National Aeronautics and Space Administration (page images at HathiTrust; US access only)
• NACA wartime reports (Langley Memorial Aeronautical Laboratory, 1944), by F. B. Gustafson, United States National Advisory Committee for Aeronautics, and Langley Aeronautical Laboratory (page images at HathiTrust)
• Effect of compressibility on the hovering performance of two 10-foot-diameter helicopter rotors tested in the Langley full-scale tunnel (NACA, 1958), by Joseph W. Jewel, Robert D. Harrington, United States National Advisory Committee for Aeronautics, and Langley Aeronautical Laboratory (page images at HathiTrust)
• An analysis of the autorotative performance of a helicopter powered by rotor-tip jet units (National Advisory Committee for Aeronautics, 1950), by Alfred Gessow and United States National Advisory Committee for Aeronautics (page images at HathiTrust)
• The normal component of the induced velocity in the vicinity of a lifting rotor and some examples of its application (National Advisory Committee for Aeronautics, 1953), by Walter Castles, Jacob Henri De Leeuw, and United States National Advisory Committee for Aeronautics (page images at HathiTrust)
• Studies of the lateral-directional flying qualities of a tandem helicopter in forward flight (National Advisory Committee for Aeronautics, 1953), by Kenneth B. Amer, Robert J. Tapscott, and United States National Advisory Committee for Aeronautics (page images at HathiTrust)
• Charts for estimating tail-rotor contribution to helicopter directional stability and control in low-speed flight (National Advisory Committee for Aeronautics, 1954), by Kenneth B. Amer, Alfred Gessow, and United States National Advisory Committee for Aeronautics (page images at HathiTrust)
• Differential equations of motion for combined flapwise bending, chordwise bending, and torsion of twisted nonuniform rotor blades (National Advisory Committee for Aeronautics, 1957), by John C. Houbolt, George W. Brooks, and United States National Advisory Committee for Aeronautics (page images at HathiTrust)
• Directional stability characteristics of two types of tandem helicopter fuselage models (National Advisory Committee for Aeronautics, 1954), by James L. Williams and United States National Advisory Committee for Aeronautics (page images at HathiTrust)
• NACA Wartime Reports. Series L. (National Advisory Committee for Aeronautics, 1944), by F. J. Bailey, F. B. Gustafson, Langley Aeronautical Laboratory, and United States National Advisory Committee for Aeronautics (page images at HathiTrust)
• A study of feedback, blade and hub parameters on flap bending due to non-uniform rotor-disk turbulence (Southern Illinois University at Edwardsville, Dept. of Mathematical Studies, 1976), by G. H. Gaonkar and A. K. Subramanian (page images at HathiTrust; US access only)
• Vibration handbooks for helicopters. (Distributed by the U.S. Dept. of Commerce. Office of Technical Services, 1954), by Robert A. Wagner (page images at HathiTrust)
• Robinson Helicopter Company R22 loss of main rotor control accidents. (National Transportation Safety Board, 1996), by United States. National Transportation Safety Board (page images at HathiTrust)
• Aeroelasticity and structural optimization of composite helicopter rotor blades with swept tips (National Aeronautics and Space Administration, Langley Research Center ;, 1995), by K. A. Yuan, Peretz Friedmann, Langley Research Center, and Los Angeles. Mechanical University of California (page images at HathiTrust)

More items available under broader and related terms at left.