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Ahmed, Syed R. and Yin, Jianping and Dobrzynski, Werner (1997) Effect of non-uniform rotation on acoustics and aerodynamics of propellers. In: 5th International Congress on Sound and Vibration, 2, pp. 607-614. Proceedings 5th International Congress on Sound and Vibration 1997. 5th ICSV, 1997-12-15 - 1997-12-18, University of Adelaide, South Australia.
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Abstract
This numerical study investigates the influence of non-uniform rotation on the aerodynamics and acoustics of multi-blade propellers.Non-uniform rotational motion is inherent to piston engine driven propellers. the effect of rotational speed non-uniformity is the generation of excess harmonic noise due to unsteady aerodynamic blade-loading. In case of mismatch between periodicity of non-uniformity and the basic blade passing frequency, additional harmonics are generated due to the complex blade kinematics. For a periodicity coincidence the effects are masked due to overlapping of the frequencies. The level of such extra harmonics may be high enough to dominate the overall A-weighted noise level. Propeller noise radiation for non-uniform rotation is no longer omnidirectional along azimuth and exhibits also a different characteristic in the polar direction.
| Item URL in elib: | https://elib.dlr.de/19907/ | ||||||||||||||||
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| Document Type: | Conference or Workshop Item (Paper) | ||||||||||||||||
| Title: | Effect of non-uniform rotation on acoustics and aerodynamics of propellers | ||||||||||||||||
| Authors: |
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| Date: | December 1997 | ||||||||||||||||
| Journal or Publication Title: | 5th International Congress on Sound and Vibration | ||||||||||||||||
| Open Access: | No | ||||||||||||||||
| Gold Open Access: | No | ||||||||||||||||
| In SCOPUS: | No | ||||||||||||||||
| In ISI Web of Science: | No | ||||||||||||||||
| Volume: | 2 | ||||||||||||||||
| Page Range: | pp. 607-614 | ||||||||||||||||
| Publisher: | Proceedings 5th International Congress on Sound and Vibration 1997 | ||||||||||||||||
| Status: | Published | ||||||||||||||||
| Keywords: | Unsteady panel method, aerodynamics of propellers, pressure time history, acoustic spectrum | ||||||||||||||||
| Event Title: | 5th ICSV | ||||||||||||||||
| Event Location: | University of Adelaide, South Australia | ||||||||||||||||
| Event Type: | international Conference | ||||||||||||||||
| Event Start Date: | 15 December 1997 | ||||||||||||||||
| Event End Date: | 18 December 1997 | ||||||||||||||||
| HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||
| HGF - Program: | Aeronautics | ||||||||||||||||
| HGF - Program Themes: | L VU - Air Traffic and Environment (old) | ||||||||||||||||
| DLR - Research area: | Aeronautics | ||||||||||||||||
| DLR - Program: | L VU - Air Traffic and Environment | ||||||||||||||||
| DLR - Research theme (Project): | L - Quiet Air Traffic (old) | ||||||||||||||||
| Location: | Braunschweig | ||||||||||||||||
| Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Technical Acoustics | ||||||||||||||||
| Deposited By: | Yin, Dr.-Ing. Jianping | ||||||||||||||||
| Deposited On: | 01 Dec 2005 | ||||||||||||||||
| Last Modified: | 24 Apr 2024 19:01 |
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