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Interpretation of Air-to-Air Flyby Noise Measurements on a Piston-powered Propeller Aeroplane.

Kallergis, M. (1996) Interpretation of Air-to-Air Flyby Noise Measurements on a Piston-powered Propeller Aeroplane. In: Proc. Internoise 96, Liverpool, Großbritannien, 30.7.-2.8.1996, (Poster Session), pp. 345-348.

Full text not available from this repository.

Abstract

To clarify certain conspicious unsymmetries in the radiated noise from piston-powered single-engine propeller-driven aeroplanes "air-to-air acoustic measurements" were conducted employing an inherently quiet sail plane as a microphone carrier and to fly the very test aircraft at various positions relative to it (i.e. above, below and to the side of). The test aircraft, a Dornier DO 27, was equipped with a 6-piston combustion engine and a 2-blade propeller with an uneven gear-ratio in between, faciliting the separation of propeller and engine exhaust contributions in the combined radiated acoustic pressure time history (PTH). The engine's twin pipe exhaust system was located on the underside of the aircraftsuch that its two orifices were acoustically shielded to some extent from an observer above the aircraft. The purpose of this study was to check on the acoustic consequences of superposing the propeller signal and the exhaust signal, hoping that certain characteristics.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1996,
Title:Interpretation of Air-to-Air Flyby Noise Measurements on a Piston-powered Propeller Aeroplane.
Authors:
AuthorsInstitution or Email of Authors
Kallergis, M.UNSPECIFIED
Date:1996
Journal or Publication Title:Proc. Internoise 96, Liverpool, Großbritannien, 30.7.-2.8.1996, (Poster Session)
Page Range:pp. 345-348
Series Name:Book 1
Status:Published
Keywords:Propeller airplane noise, piston-engine noise, sailplane isolation/ superposition of acoustic signals, acoustic pressure time history....
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 10:06

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