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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.

Full text not available from this repository.

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/
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 AuthorsAuthors ORCID iD
Splettstößer, W. R.UNSPECIFIEDUNSPECIFIED
Schultz, K.-J.UNSPECIFIEDUNSPECIFIED
Kube, R.UNSPECIFIEDUNSPECIFIED
Brooks, T.F.UNSPECIFIEDUNSPECIFIED
Booth, Jr., E.R., UNSPECIFIEDUNSPECIFIED
Niesl, G.UNSPECIFIEDUNSPECIFIED
Streby, O.UNSPECIFIEDUNSPECIFIED
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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