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Acoustics of Ultralight Aeroplanes.

Heller, H. and Dahlen, H. and Dobrzynski, W. (1990) Acoustics of Ultralight Aeroplanes. Journal of Aircraft, Vol. 27, No. 6 (June 1990), pp. 529-535.

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Abstract

Stringent noise limits have been imposed on ultralight aeroplanes in the Federal Republic of Germany. The "Committee on Aviation Environmental Protection" (CAEP) of the "International Civil Aviation Organization" (ICAO) intends to formulate internationally binding noise regulations for ultralight aeroplanes. In view of these developments an experimental and theoretical research program was initiated to investigate specifically the noise sources and noise characteristics of ultralight aeroplanes. The objective of this study was to evaluate the technical feasibility of meeting existing or proposed noise limits - especially in comparison with the noise limits for "light propeller-driven aeroplanes" (ANNEX 16/Chapter 6) and to further establish the minimum noise radiation from various types of ultralight aeroplanes within operational limitations. Flyover and ground static noise measurements on tractor- and pusher-propeller driven ultralight aeroplanes and wind tunnel noise measurements on isolated full-scale ultralight-aeroplane propellers were conducted. Engine noise was studied seperately providing information on the relationship of engine rotational speed and exhaust noise. In an overall sense the study showed that only tractor propeller driven ultralight aeroplanes have a chance to comply with the current stringent (German) noise limits; they must be of clean aerodynamic design, be equipped with thoroughly muffled engines and their operational propeller blade tip Mach number must be limited to values well below 0.5.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1990, pages=7,
Title:Acoustics of Ultralight Aeroplanes.
Authors:
AuthorsInstitution or Email of Authors
Heller, H.UNSPECIFIED
Dahlen, H.UNSPECIFIED
Dobrzynski, W.UNSPECIFIED
Date:1990
Journal or Publication Title:Journal of Aircraft, Vol. 27, No. 6 (June 1990)
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 529-535
Status:Published
Keywords:Ultralight Aircraft, Propelller Noise
HGF - Research field:UNSPECIFIED
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:no assignment
DLR - Research theme (Project):L - Turbine Technologies
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 10:04

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