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A Higher Harmonic Control Test in the DNW to Reduce Impulsive BVI Noise

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.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1994,
Title:A Higher Harmonic Control Test in the DNW to Reduce Impulsive BVI Noise
Authors:
AuthorsInstitution or Email of Authors
Splettstößer, W. R.UNSPECIFIED
Schultz, K.-J.UNSPECIFIED
Kube, R.UNSPECIFIED
Brooks, T.F.UNSPECIFIED
Booth, Jr., E.R., UNSPECIFIED
Niesl, G.UNSPECIFIED
Streby, O.UNSPECIFIED
Date:1994
Journal or Publication Title:Journal of the American Helicopter Society, 13. Oktober 1994
Refereed publication:Yes
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
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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