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Splettstößer, W. R. and Schultz, K.-J. and Kube, R. and Brooks, T.F. and Booth, Jr., E.R., and Niesl, G. and Streby, O. (1994) A Higher Harmonic Control Test in the DNW to Reduce Impulsive BVI Noise. Journal of the American Helicopter Society, 13. Oktober 1994, Vol. 39 (4), pp. 3-13.
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Abstract
A model rotor acoustic test was performed to examine the benefit of higher-harmonic control (HHC) of blade pitch to reduce blade-vortex interaction (BVI) impulsive noise. A 40-percent dynamically scaled, four-bladed model of a BO-105 main rotor was tested in the German-Dutch Wind Tunnel (DNW). Acoustic measurements were made in a large plane underneath the rotor employing a traversing in-flow microphone array in the anechoic environment of the open test section. Noise characteristics and noise directivity patterns as well as vibratory loads were measured and used to demonstrate the changes when different HHC schedules (different modes, amplitudes, phases) were applied. Dramatic changes of the acoustic signatures and the noise radiation directivity with HHC phase variations were found.
| Item URL in elib: | https://elib.dlr.de/36310/ | ||||||||||||||||||||||||
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| Document Type: | Article | ||||||||||||||||||||||||
| Additional Information: | LIDO-Berichtsjahr=1994, | ||||||||||||||||||||||||
| Title: | A Higher Harmonic Control Test in the DNW to Reduce Impulsive BVI Noise | ||||||||||||||||||||||||
| Authors: |
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| Date: | 1994 | ||||||||||||||||||||||||
| Journal or Publication Title: | Journal of the American Helicopter Society, 13. Oktober 1994 | ||||||||||||||||||||||||
| Refereed publication: | Yes | ||||||||||||||||||||||||
| Open Access: | No | ||||||||||||||||||||||||
| Gold Open Access: | No | ||||||||||||||||||||||||
| In SCOPUS: | No | ||||||||||||||||||||||||
| In ISI Web of Science: | Yes | ||||||||||||||||||||||||
| Volume: | Vol. 39 | ||||||||||||||||||||||||
| Page Range: | pp. 3-13 | ||||||||||||||||||||||||
| Status: | Published | ||||||||||||||||||||||||
| Keywords: | Blatt-Wirbel-Interaktionslärm, Rotorimpulslärm, Lärmreduktion, höherharmonische Blattsteuerung, Rotorvibration | ||||||||||||||||||||||||
| HGF - Research field: | Aeronautics, Space and Transport (old) | ||||||||||||||||||||||||
| HGF - Program: | Aeronautics | ||||||||||||||||||||||||
| HGF - Program Themes: | other | ||||||||||||||||||||||||
| DLR - Research area: | Aeronautics | ||||||||||||||||||||||||
| DLR - Program: | L DT - Drehflüglertechnologien | ||||||||||||||||||||||||
| DLR - Research theme (Project): | L - The Quiet and Comfortable Rotorcraft (old) | ||||||||||||||||||||||||
| Location: | Köln-Porz , Braunschweig , Göttingen | ||||||||||||||||||||||||
| Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik | ||||||||||||||||||||||||
| Deposited By: | DLR-Beauftragter, elib | ||||||||||||||||||||||||
| Deposited On: | 03 Apr 2006 | ||||||||||||||||||||||||
| Last Modified: | 27 Apr 2009 10:05 |
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