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Activities of European Research Laboratories Regarding Helicopter Internal Noise

Simon, Frank and Haase, Thomas and Unruh, Oliver and Pohl, Martin and Tijs, Emiel and Wijntjes, Rik and Wal van der, Henk and Ghiringhelli, Gian Luca (2014) Activities of European Research Laboratories Regarding Helicopter Internal Noise. Aerospace Lab (7). Onera Scientific Information Department. DOI: 10.12762/2014.AL07-04 ISBN 2107-6596 ISSN 2107-6596

Full text not available from this repository.

Abstract

Although the acoustic comfort in helicopter cabins is not subject to European Recommendations regarding aeronautic environmental noise (ACARE 2020), helicopter manufacturers use many resources to improve internal acoustic comfort. This task is particularly difficult because, on the one hand, passengers are in close proximity to the disturbing sources and, on the other hand, the noise frequency range is located in the domain of high sensitivity of the human ear (500-5000 Hz). These activities are often conducted in conjunction with external laboratories specialized in the aeronautic domain. The purpose of this paper is to describe how different European laboratories (affiliations of the authors), involved in a "Helicopter Garteur Action Group" (AG20), usually address this problem of helicopter internal noise, in particular in terms of design, characterization or active control of vibration applied to helicopter panels, in order to improve acoustic comfort. Typical measurement techniques and applications of simulation methods are presented to illustrate the activities of laboratories, especially the characterization and optimization of the acoustic behavior of an isolated helicopter panel and, secondly, the evaluation of its effect in a cabin mock-up or in flight. In addition, procedures of active (or semi-active) control are described and applied to the vibro-acoustic transmission of an isolated panel, then to an anti-torque plate of a helicopter mock-up and finally in flight, in order to reduce the noise produced by gear-box vibrations.

Item URL in elib:https://elib.dlr.de/89952/
Document Type:Article
Title:Activities of European Research Laboratories Regarding Helicopter Internal Noise
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Simon, FrankOneraUNSPECIFIED
Haase, ThomasUNSPECIFIEDUNSPECIFIED
Unruh, OliverUNSPECIFIEDUNSPECIFIED
Pohl, MartinUNSPECIFIEDUNSPECIFIED
Tijs, EmielMicroflownUNSPECIFIED
Wijntjes, RikNLRUNSPECIFIED
Wal van der, HenkNLRUNSPECIFIED
Ghiringhelli, Gian LucaPolitecnico di MilanoUNSPECIFIED
Date:June 2014
Journal or Publication Title:Aerospace Lab
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.12762/2014.AL07-04
Editors:
EditorsEmail
Touboul, PierreUNSPECIFIED
Publisher:Onera Scientific Information Department
ISSN:2107-6596
ISBN:2107-6596
Status:Published
Keywords:Internal Noise, Transmission loss, Intensity
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Böhringer-Thelen, Isolde
Deposited On:05 Aug 2014 08:01
Last Modified:03 May 2017 15:16

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