A Review and Update of the NASA Aircraft Noise Prediction Program Propeller Analysis System

Golub, Robert A.; Nguyen, Lan Chi

doi:10.4271/891032

SAE Technical Paper Series 1989

DOI: 10.4271/891032

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A Review and Update of the NASA Aircraft Noise Prediction Program Propeller Analysis System

Robert A. Golub

Lan Chi Nguyen

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1997

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“…Previous studies describe the prediction capabilities, features, and improvements to the original system. 10,11 The elements of ANOPP PAS that were relevant to this study are the modules that predict the propeller loads and the noise module. Descriptions of the modules and their attendant theories can be found in Ref.…”

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Influence of Shaft Angle of Attack on Sound Radiation by Subsonic Propellers

Kelly

Nguyen

1997

Journal of Aircraft

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The formulation to account for effects of propeller angle of attack on acoustic radiation by propellers is presented. A propeller operating at an angle of attack presents a nonuniform in ow situation that is known to have a pronounced in uence on noise. Noise predictions, based on this new formulation, are compared with measured wind-tunnel data. Predictions for observers xed in the propeller plane are also included to assess the in uence of shaft angle of attack. Nomenclaturec 0 = ambient speed of sound f = function de ning blade surface l = local force per unit area of blade acting on uid l r = component of loading vector in direction of radiation vector, l i r i M = source Mach number M r = component of source Mach vector in direction of radiation vector, M i ri n = blade surface normal vector p = acoustic pressure p L = acoustic pressure produced by loading p T = acoustic pressure produced by thickness r = distance from source point at emission time to observer r = unit vector in direction r S = surface area t = time the noise signal is received by observer VF = forward velocity of aircraft v = source velocity vector v n = source velocity component in direction of blade normal, v i n i x = observer position in ground xed frame y = source position in ground xed frame a = angle of attack of propeller shaft h = source position in blade xed frame t = time at which noise signal is emitted at source position c = angle between x 1 and h 1 axes, Vt V = angular velocity of blade

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Influence of Shaft Angle of Attack on Sound Radiation by Subsonic Propellers

Kelly

Nguyen

1997

Journal of Aircraft

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A Review and Update of the NASA Aircraft Noise Prediction Program Propeller Analysis System

Cited by 1 publication

References 5 publications

Influence of Shaft Angle of Attack on Sound Radiation by Subsonic Propellers

Influence of Shaft Angle of Attack on Sound Radiation by Subsonic Propellers

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