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European helicopter rotor noise research - Highlights of recent projects

Splettstößer, W.R. (1999) European helicopter rotor noise research - Highlights of recent projects. 2nd Convention of the European Acoustics Association, Forum Acusticum, 14.-19.03.1999.

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Abstract

Significant advances in understanding, modeling, and controlling helicopter rotor noise have been made in the course of several major European aeroacoustic research projects over the past years. The availability of the German-Dutch Wind Tunnel (DNW), in particular, has enabled research on relatively large main rotor models (up to typically 40% full scale). Here, the simultaneous application and use of blade-mounted absolute pressure sensors to study the very aeroacoustic source mechanisms, of advanced acoustic-data acquisition systems for the radiated noise, of non-intrusive flow visualization as well as flow and blade deflection measurement techniques to investigate the rotor wake and the blade dynamic response has provided much insight into the physics of rotor aeroacoustics, particularly into the rotor blade-vortex interaction (BVI) impulsive noise phenomenon. In efforts towards controlling BVI impulsive noise, in some research projects, active blade-root control techniques have been investigated to favorably affect the BVI geometry and thus minimize the impulsive noise radiation. Much of the experimental data acquired served as benchmark information to enhance the mathematical modeling of the rotor wake, the rotor airloads, and the noise radiation. In this lecture, several major European helicopter aeroacoustic research projects are discussed.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999,
Title:European helicopter rotor noise research - Highlights of recent projects
Authors:
AuthorsInstitution or Email of Authors
Splettstößer, W.R.UNSPECIFIED
Date:1999
Status:Published
Event Title:2nd Convention of the European Acoustics Association, Forum Acusticum, 14.-19.03.1999
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: Claudia Grant
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:07

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