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Advanced study for active noise control in aircraft

Objective


The applications of piezo ceramic patches on the primary structure have demonstrated that this approach can be a potential alternative to the classical passive dynamic vibration absorbers and to the loudspeakers.

The research in advanced actuator design showed promising results for the piezo-ceramic based actuators and electrodynamic shakers. Flight test with the Dornier 328 as well as the ground tests in the Saab 340 ground test section in combination with loudspeakers showed very good results. However, for future applications of these approaches the actuators need more power.

The results obtained using speaking panels in real flight are very encouraging. Additional works are needed to overcome the two phenomena high driving voltage and some non-linear behaviour in order to raise this technology to an industrial state.

Neural network and genetic algorithm modelling has provided good locations of sensors and actuators at lower computation costs than others analytical algorithms.

Extensive testing and detailed F.E-modelling was performed in order to construct accurate vibro-acoustic models of the structural and acoustical responses. The results obtained during Saab 340 ground test section showed excellent reductions and the feasibility of this approach.

During the study 4 control algorithms were designed and selected for ground and flight tests: The robust vibration control algorithm exhibited good convergence characteristics both for rectified frame element and in the ATR42 mock-up tests.
The twin-reference algorithm has proven to be valuable even in flight conditions with the synchrophaser turned off. The results of Saab 340 mock-up tests showed the need of multiple reference algorithms for real applications.
The remote microphone algorithm, capable of reducing noise at positions well away from the error microphones, reaches noise reductions very close to those achieved with a LMS algorithm.
The robust acoustic control algorithm was able to reduce the noise field significantly even during fast changes in RPM and during flight with different propellor RPM.

In total three different full scale test campaigns were conducted at the end of the project, successfully verifying various different advanced developments in the field of active noise control.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Dornier Luftfahrt GmbH
Address
An Der Bundesstraße 31
88039 Friedrichshafen
Germany

Participants (21)

Alenia Aerospazio - Un' Azienda Finmeccanica SpA
Italy
Address
Viale Dell'aeronautica 1
80038 Pomigliano D'arco
Aérospatiale Société Nationale Industrielle SA
France
Address
316 Route De Bayonne
31060 Toulouse
Business Unit of TNO Built Environment and Geosciences
Netherlands
Address
Van Mourik Broekmanweg 6
2628 XE Delft
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
Chemin Joseph Aiguier 31
13402 Marseille
CENTRO ITALIANO RICERCHE AEROSPAZIALI SCPA
Italy
Address
Via Maiorise
81043 Capua
Daimler-Benz Aerospace AG
Germany
Address

22876 Wedel
EADS - CONSTRUCCIONES AERONAUTICAS S.A.
Spain
Address
S/n,avenida John Lennon S/n
28906 Getafe
Eidgenössische Technische Hochschule - ETH Zürich
Switzerland
Address
3,Tannenstrasse 3
8092 Zürich
FFA - The Aeronautical Research Institute of Sweden
Sweden
Address

161 11 Bromma
Fokker Aircraft BV
Netherlands
Address
15,Hoogoorddreef
1100 AE Amsterdam
INSTITUTO SUPERIOR TECNICO
Portugal
Address
1,Avenida Rovisco Pais 1
1049-001 Lisboa
KATHOLIEKE UNIVERSITEIT LEUVEN
Belgium
Address
300 B,celestijnenlaan 300 B
3001 Heverlee
LEUVEN MEASUREMENTS AND SYSTEMS INTERNATIONAL NV
Belgium
Address
65,Interleuvenlaan 68
3001 Heverlee
METRAVIB RECHERCHE DÉVELOPPEMENT SERVICE SA
France
Address
Chemin Des Ormeaux 200
69760 Limonest
Matra Cap Systèmes
France
Address
6 Rue Dewoitine
78142 Vélizy-villacoublay
Saab Aircraft AB
Sweden
Address

581 88 Linköping
TECHNICAL UNIVERSITY OF DENMARK
Denmark
Address
Anker Engelundsvej 1, Building 101
2800 Lyngby
THE PROVOST, FELLOWS AND SCHOLARS OF THE COLLEGE OF THE HOLY AND UNDIVIDED TRINITY OF QUEEN ELIZABETH NEAR DUBLIN HEREINAFTER TRINITY COLLEGE DUBLIN
Ireland
Address
Parsons Building, Trinity College
2 Dublin
University of Karlskrona-Ronneby
Sweden
Address

372 25 Ronneby
University of Patras
Greece
Address
Rion
26500 Patras
Università degli Studi di Napoli Federico II
Italy
Address
Via Claudio 21
80125 Napoli