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Aircraft Propeller/Piston-Engine Propulsion: A Moving Source Pair Susceptible to Active Noise Control

Kallergis, M. (1994) Aircraft Propeller/Piston-Engine Propulsion: A Moving Source Pair Susceptible to Active Noise Control. Proceedings, Int. Conference Flow Acoustics: A Technology Audit, Lyon, Frankreich, 11.-13.07.94.

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Abstract

For many years work has been under way to investigate the possibility to reduce the noise of piston-engine driven propeller/aeroplanes by appropriately superposing the very propeller/noise with exhaust noise from the piston engine to pro- duce a destructive interference. In this context, it should be understood that certain propeller driven aeroplanes are equipped with piston engines whose fundamental firing frequency coincides with the rotational (blade passing) frequency of the propeller. Taking the two sources as a system consisting of a primary source (propeller) and a secondary anti-noise source (engine exhaust), an active noise control technique can be applied. Indeed, the signature of both the propeller and the engine exhaust noise is characterized by periodic sound pressure fluctations. In establishing a suitable phase shift between these two periodic sound signals a destructive interference can be attained, in principle resulting in a lesser noise level on the ground.

Document Type:Conference or Workshop Item (Paper)
Additional Information: institution=Flowcs Williams, Univ. Cambridge/Comte-Bellot, E. Centrl. d. Lyon, LIDO-Berichtsjahr=1994,
Title:Aircraft Propeller/Piston-Engine Propulsion: A Moving Source Pair Susceptible to Active Noise Control
Authors:
AuthorsInstitution or Email of Authors
Kallergis, M.UNSPECIFIED
Date:1994
Page Range:pp. 70-73
Status:Published
Keywords:Active Noise Control, Propeller Noise, Piston/Engine Noise, Interfere nce Pattern, Flyover Noise, Noise Reduction
Event Title:Proceedings, Int. Conference Flow Acoustics: A Technology Audit, Lyon, Frankreich, 11.-13.07.94
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L TT - Triebwerkstechnologien
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:05

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