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Reduction of aircraft noise by nacelle treatment and active control

Objective



Objectives and content:

Community reaction to aircraft noise is now recognised as one of the most important constraints limiting future growth of air transport industry unless all future aircraft noise levels decrease in such a manner to offset the effect of air traffic growth on noise exposure. The RANNTAC programme, together with the RESOUND programme on engine noise source reduction technology and the RAIN programme on the reduction of airframe and installation noise are the three main and complementary pieces of the proposed R & D effort co-ordinated at European level by the X-NOISE thematic network on external noise. This effort is needed to meet the requirements expressed in the EU consultation paper of November 96 for reduction in aircraft noise levels and accept the US implicit challenge a complying with much more stringent noise rules in the early 2000's.The objective of the combined programme is to deliver within 8 year, aircraft environmental noise abatement of 6 decibels both at departure from airports and at arrival relative to current technology demonstrated by aeroplane industry. The objective of RANNTAC is to acquire the technology necessary to support the development and manufacturing of turbofan engine nacelles featuring noise reduction devices and designs enabling to achieve up to 4 dB attenuation on engine internal noise sources in addition to that achieved by currently produced acoustic liners.

Half this noise reduction will be demonstrated at the end of the programme while the means to achieve the reminder will be identified and defined for further large-scale demonstration. The practical results of the proposed research is to secure the design capabilities of developing in future transport aircraft nacelles, a large range of novel sound absorbing liners, air intake shapes allowing to control the fan noise radiation and in duct active noise control systems. The work programme will provide theoretical and experimental acoustic evaluation of all proposed systems and concepts in the context of real nacelle duct environment and assessment of the expected benefits on future aircraft noise together with the chances of industrial application and foreseen impaction aircraft economics.

The programme's structure features three tasks:
Specifications, Assessments, Exploitation and Management;
Development of novel nacelle treatment concepts;
Development of Active Noise Control technology in nacelles.

The work will be essentially carried out in parallel in tasks 2 an 3, each of them developing and providing in the end a panel of noise reduction solutions of different types, every type being evaluated on appropriate common testfacilities. BE97-4121

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

AIRBUS FRANCE SAS
Address
Route De Bayonne 316
31060 Toulouse
France

Participants (21)

BMW Rolls-Royce GmbH - Aeroengines
Germany
Address
11,Eschenweg
15827 Dahlewitz
Bertin Technologies S.A.
France
Address
Rue Pierre Curie
78373 Plaisir
CENTRE DE TRANSFERT DE TECHNOLOGIE DU MANS - ASSOCIATION POUR LES TRANSFERT DE TECHNOLOGIES DU MANS
France
Address
Rue De Thalès De Milet 20
72000 Le Mans
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
Chemin Joseph Aiguier 31
13402 Marseille
Cambridge Concept Ltd.
United Kingdom
Address
.,Cowley Road
CB4 4WS Cambridge
DaimlerChrysler AG
Germany
Address

81663 München
Deutsches Zentrum für Luft- und Raumfahrt e.V.
Germany
Address
8,Mueller-breslau-strasse
10623 Berlin
Dornier GmbH
Germany
Address
31,An Der Bundesstrasse
88039 Friedrichshafen
ECOLE CENTRALE DE LYON
France
Address
Avenue Guy De Collongue 36
69131 Ecully
Hispano-Suiza SA
France
Address
Route Du Pont Viii
76700 Harfleur
Industriselskabet Ferroperm A/S
Denmark
Address
7,Stubbeled
2950 Vedbak
METRAVIB RECHERCHE DÉVELOPPEMENT SERVICE SA
France
Address
Chemin Des Ormeaux 200
69760 Limonest
MTU AERO ENGINES GMBH
Germany
Address
665,Dachauer Strasse 665
80995 Munchen
NATIONAL UNIVERSITY OF IRELAND, GALWAY
Ireland
Address
Nuns Island
90 Galway
Nationaal Lucht- en Ruimtevaart Laboratorium
Netherlands
Address
31,Voorsterweg
8316 PR Marknesse
Rolls Royce PLC
United Kingdom
Address
Moor Lane
DE2 8BJ Derby
SWISS FEDERAL INSTITUTE OF TECHNOLOGY LAUSANNE
Switzerland
Address
Department Of Electrical Engineering - Elb
1015 Lausanne
SWISS FEDERAL INSTITUTE OF TECHNOLOGY LAUSANNE
Switzerland
Address
Mx-g Ecublens
1015 Lausanne
Société Nationale d'Etudes et de Construction de Moteurs d'Aviation
France
Address
Centre De Villaroche
77550 Noissy - Cramayel
UNIVERSITY OF SOUTHAMPTON
United Kingdom
Address
Highfield
Southampton
University of Salford
United Kingdom
Address
Meadow Road
M7 9NU Salford