Progress Report on Propeller Aircraft Flyover Noise Research

Metzger, F. B.; Magliozzi, B.; Pegg, R. J.

doi:10.4271/760454

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…The system used to make blade surface pressure measurements has been described in Reference (1). In order to present these blade surface pressure results in a meaningful way, data from each of the seven transducers were first displayed…”

Section: Blade Surface Pressuresmentioning

confidence: 99%

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Some Measured and Calculated Effects of Forward Velocity on Propeller Noise

Pegg

Magliozzi²,

Farassat

1977

ASME 1977 International Gas Turbine Conference and Products Show

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The results of a program investigating the sources of noise in unshrouded propellers under forward flight conditions and a comparison with theory are reported. Tests were conducted using an instrumented three-bladed propeller installed on a turbine-powered, twin-engine, general aviation airplane. Measurements included far-field noise on the ground and on the aircraft wing tip, propeller blade surface pressures, atmospheric turbulence, and aircraft operating conditions. The primary result of the full-scale flight tests was to confirm that foward-flight propeller noise levels are lower than those experienced under static conditions and that the most significant reductions occur at the mid-frequencies which dominate perceived and A-weighted noise levels. Analytical techniques have been used to predict the observed experimental trends and to provide further insight into the noise generating mechanisms. Correlation with experimental data is shown to be good at low frequencies under static conditions and at all frequencies in forward flight. It is tentatively concluded that propeller noise generation in flight may result from steady loads (including blade thickness effects). Under static conditions, the principal noise source appears to be the intersection of the propeller with persistent turbulent eddies passing through the propeller disk.

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Section: Blade Surface Pressuresmentioning

confidence: 99%

“…Recently, it has been recognized that significant differences exist in the noise signatures of propellers operating statically and in flight (1). 1 Until recently, very little mention has been made in the literature regarding the different character of the noise of propellers under static and flight conditions.…”

Section: Introductionmentioning

confidence: 99%

Some Measured and Calculated Effects of Forward Velocity on Propeller Noise

Pegg

Magliozzi²,

Farassat

1977

ASME 1977 International Gas Turbine Conference and Products Show

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show abstract

“…This information suggests that reduced interior noise levels might be obtained by operational procedures involving the choice of engine rpm or the synchrophasing of twin engines. Effort toward understanding and reducing propeller source noise 5 ' 11 has been directed principally to far-field community noise applications. This work can be used as a general guide; however, it appears that the information required for interior noise control studies is not available.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Interior Noise in a Twin-Engine Light Aircraft

Mixson

Barton

Vaicaitis

1978

Journal of Aircraft

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This paper describes experimental studies of interior noise in a twin-engine, propeller-driven, light aircraft. An analytical model for this type of aircraft is also discussed. Results indicate that interior noise levels in this aircraft due to propeller noise can be reduced by reducing engine rpm at constant airspeed (about 3 (IB), and by synchrophasing the twin engines/propellers (perhaps up to 12 dB). Ground tests show that the exterior noise pressure imposed on the fuselage consists of a complex combination of narrow-band harmonics due to propeller and engine exhaust sources. This noise is reduced by about 20-40 dB (depending on the frequency) by transmission through the sidewall to the cabin interior. The analytical model described uses modal methods and incorporates the flat-sided geometrical and skin-stringer structural features of this light aircraft.

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Investigation of Rotor Noise Source Mechanisms with Forward Speed Simulation

Grosche

Stiewitt

1978

AIAA Journal

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Progress Report on Propeller Aircraft Flyover Noise Research

Cited by 5 publications

References 3 publications

Some Measured and Calculated Effects of Forward Velocity on Propeller Noise

Some Measured and Calculated Effects of Forward Velocity on Propeller Noise

Investigation of Interior Noise in a Twin-Engine Light Aircraft

Investigation of Rotor Noise Source Mechanisms with Forward Speed Simulation

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