Kallergis, M. (1995) Validation through Flyover Noise Tests of the Overall Amplification or Diminution Effect of Superposing "Artificial" Propeller and Piston-Engine Exhaust Sound Waves. In: Proceedings First Joint CEAS/AIAA Aeroacoustics Conference, Muenchen, 12.-15.06.95, Volume I, pp. 213-222.
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The main sources dominating the far-field noise of a G.A. piston engine propeller aircraft have been identified to be the propeller and the engine exhaust. Therefore, the noise received on the ground during the flyover of such airplanes results from the superposition of the individual propeller and engine exhaust sound waves. Although the individual waveforms of both the propeller and the engine exhaust signals received change very little when the aircraft is passing overhead, the combined waveform (superposition) of these two signals - as observed on the ground - changes quite dramatically. A computational study has been condicted where simulated engine exhaust and propeller sound signals were combined at different phase shifts. The phase angle differences actually correspond to different locations of the aircraft moving along a horizontal flight path relative to an observer on the ground.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Validation through Flyover Noise Tests of the Overall Amplification or Diminution Effect of Superposing "Artificial" Propeller and Piston-Engine Exhaust Sound Waves|
|Journal or Publication Title:||Proceedings First Joint CEAS/AIAA Aeroacoustics Conference, Muenchen, 12.-15.06.95|
|Page Range:||pp. 213-222|
|Keywords:||Active control of sound, propeller noise, piston engine exhaust noise, superposition of sound signals, flyover noise|
|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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