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On the drastic propeller-noise increase due to (always present) engine crank-shaft rotational oscillations: A wind tunnel full-scale experimental demonstration.

Dobrzynski, W. and Gehlhar, B. (1995) On the drastic propeller-noise increase due to (always present) engine crank-shaft rotational oscillations: A wind tunnel full-scale experimental demonstration. In: Proc. Inter-Noise 95. Inter-Noise 95, July 10-12, Newport Beach/USA, 1995.

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Abstract

The analysis of flyover noise data, when taken on piston engine powered propeller-driven aircraft (General Aviation aeroplanes), reveals the occurrence of so far unexplainable additional propeller noise sources. In order to study such detrimental effects on the overall aircraft noise radiation in more detail,tests were performed in the German-Dutch Wind Tunnel (DNW) on a full-scale aircraft powered by a 150-kW piston engine and applying two different propellers respectively. The test results confirmed the presumption that excessive propeller noise radiation is due to nonuniform rotational blade motion. It was found that the drive shaft exhibits a nonuniform angular speed within one revolution with an amplitude corresponding to about 2 % of the average speed. This behaviour, typical for piston engines, is capable to generate tones.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1995, pages=4,
Title:On the drastic propeller-noise increase due to (always present) engine crank-shaft rotational oscillations: A wind tunnel full-scale experimental demonstration.
Authors:
AuthorsInstitution or Email of Authors
Dobrzynski, W.UNSPECIFIED
Gehlhar, B.UNSPECIFIED
Date:1995
Journal or Publication Title:Proc. Inter-Noise 95
Status:Published
Keywords:Propeller noise, nonuniform propeller rotational-speed
Event Title:Inter-Noise 95, July 10-12, Newport Beach/USA, 1995
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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