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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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.
|Additional Information:||LIDO-Berichtsjahr=1990, pages=7,|
|Title:||Acoustics of Ultralight Aeroplanes.|
|Journal or Publication Title:||Journal of Aircraft, Vol. 27, No. 6 (June 1990)|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 529-535|
|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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