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Ahmed, Syed R. und Yin, Jianping und Dobrzynski, Werner (1997) Effect of non-uniform rotation on acoustics and aerodynamics of propellers. In: 5th International Congress on Sound and Vibration, 2, Seiten 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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Kurzfassung
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.
| elib-URL des Eintrags: | https://elib.dlr.de/19907/ | ||||||||||||||||
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| Dokumentart: | Konferenzbeitrag (Paper) | ||||||||||||||||
| Titel: | Effect of non-uniform rotation on acoustics and aerodynamics of propellers | ||||||||||||||||
| Autoren: |
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| Datum: | Dezember 1997 | ||||||||||||||||
| Erschienen in: | 5th International Congress on Sound and Vibration | ||||||||||||||||
| Open Access: | Nein | ||||||||||||||||
| Gold Open Access: | Nein | ||||||||||||||||
| In SCOPUS: | Nein | ||||||||||||||||
| In ISI Web of Science: | Nein | ||||||||||||||||
| Band: | 2 | ||||||||||||||||
| Seitenbereich: | Seiten 607-614 | ||||||||||||||||
| Verlag: | Proceedings 5th International Congress on Sound and Vibration 1997 | ||||||||||||||||
| Status: | veröffentlicht | ||||||||||||||||
| Stichwörter: | Unsteady panel method, aerodynamics of propellers, pressure time history, acoustic spectrum | ||||||||||||||||
| Veranstaltungstitel: | 5th ICSV | ||||||||||||||||
| Veranstaltungsort: | University of Adelaide, South Australia | ||||||||||||||||
| Veranstaltungsart: | internationale Konferenz | ||||||||||||||||
| Veranstaltungsbeginn: | 15 Dezember 1997 | ||||||||||||||||
| Veranstaltungsende: | 18 Dezember 1997 | ||||||||||||||||
| HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||
| HGF - Programm: | Luftfahrt | ||||||||||||||||
| HGF - Programmthema: | L VU - Luftverkehr und Umwelt (alt) | ||||||||||||||||
| DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||
| DLR - Forschungsgebiet: | L VU - Luftverkehr und Umwelt | ||||||||||||||||
| DLR - Teilgebiet (Projekt, Vorhaben): | L - Leiser Luftverkehr (alt) | ||||||||||||||||
| Standort: | Braunschweig | ||||||||||||||||
| Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Technische Akustik | ||||||||||||||||
| Hinterlegt von: | Yin, Dr.-Ing. Jianping | ||||||||||||||||
| Hinterlegt am: | 01 Dez 2005 | ||||||||||||||||
| Letzte Änderung: | 24 Apr 2024 19:01 |
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