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Flyover Noise Reduction of Piston-Engine Propeller Aeroplanes Using an Active Noise Control Technique

Kallergis, M.K. (1994) Flyover Noise Reduction of Piston-Engine Propeller Aeroplanes Using an Active Noise Control Technique. In: SAE 1993 Transactions Journal of Aerospace, Section 1, Vol. 102, pp. 58-74. Society of Automotive Engineers, Inc., 400 Commonwealth Dr., Warrendale, PA 15096-0001, USA.

Full text not available from this repository.

Abstract

Certain propeller driven aeroplanes are equipped with piston engines whose fundamental "firing"-frequency coincides with the rotational frequency of the propeller. Taking the two sources as a system consisting of a primary source (propeller) and a secondary source (engine exhaust), an active noise control (ANC) technique can be applied. The far field noise of both the propeller and the engine exhaust is characterised by periodic sound pressure fluctuations; by generating a suitable phase shift between these two periodic sound-fields, a destructive interference may be attained, resulting in a reduced overall noise level immission on the ground. Technically, this is achieved by (1) adjusting the spatial distance between the exhaust orifice and the propeller and (2) an appropriate azimuthal positioning of the propeller on the crankshaft of the engine.

Document Type:Conference or Workshop Item (Paper)
Additional Information: institution=SAE International, LIDO-Berichtsjahr=1994,
Title:Flyover Noise Reduction of Piston-Engine Propeller Aeroplanes Using an Active Noise Control Technique
Authors:
AuthorsInstitution or Email of Authors
Kallergis, M.K.UNSPECIFIED
Date:1994
Journal or Publication Title:SAE 1993 Transactions Journal of Aerospace, Section 1, Vol. 102
Page Range:pp. 58-74
Publisher:Society of Automotive Engineers, Inc., 400 Commonwealth Dr., Warrendale, PA 15096-0001, USA
Series Name:SAE 1993
Status:Published
Keywords:Propeller Aeroplane, Piston-Engine, Destructive Interference, Noise R eduction, Primary/Anti-Noise Source
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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