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The Aeroacoustics of Helicopter Rotors - Lessons Learned from Wind Tunnel Tests (Invited Keynote Paper)

Heller, H. (1994) The Aeroacoustics of Helicopter Rotors - Lessons Learned from Wind Tunnel Tests (Invited Keynote Paper). Proceedings, Third Intl. Congress on Air- and Structure-Borne Sound a nd Vibration, 13.-15. Juni 1994, Montreal, Kanada.

Full text not available from this repository.

Abstract

This paper discusses the aeroacoustics of helicopter rotors on the basis of results from recent rotor model testing in acoustic wind tunnels and illustrates how this knowledge is utilized to both improve theoretical prediction capabilities and provide guidance towards the design (and operation) of acoustically less intrusive helicopters. To this end the current understanding of discrete frequency and broadband rotor noise generation and radiation is described for a number of important operational conditions both in terms of the farfield acoustic propagation and of the underlying source mechanisms. The use of wind tunnel experimental results in furthering theoretical approaches to predict rotor noise are briefly discussed. Efforts towards rotor noise reduction are treated and an outlook is given on promising areas of further rotor noise research.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1994, pages=22,
Title:The Aeroacoustics of Helicopter Rotors - Lessons Learned from Wind Tunnel Tests (Invited Keynote Paper)
Authors:
AuthorsInstitution or Email of Authors
Heller, H.UNSPECIFIED
Date:1994
Status:Published
Keywords:Rotor Noise Source Mechanisms, Wind Tunnel Rotor Aeroacoustic Tests, Rotor Noise Prediction and Reduction, Rotor Harmonic and Broadband Noise, Tail Rotor Noise, Blade Surface Pressures, Rotor Impulsive Noi se (BVI + High Speed)
Event Title:Proceedings, Third Intl. Congress on Air- and Structure-Borne Sound a nd Vibration, 13.-15. Juni 1994, Montreal, Kanada
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
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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