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New generation of aeronautical bearings for extreme environmental constraints

Objective

Bleed systems decrease pressure and temperature to levels acceptable for downstream pipes and air cooling system. Bleed valves, regulating the pressure, have a strong safety issue: their failures can lead to aircraft depressurisation with the immediate request to land to the closest airport. In addition to all direct consequences on passengers/crews comfort, flight delay and traffic management, failures have a strong economic impact on airliners: a diversion is estimated to 150 000. In 2004, 10 diversions, consecutive to valves failure, have been reported for the AIRBUS fleet. Valve failures, resulting of ball bearings blockage, are due to fretting and false Brinelling, known to occur in quasi-static assemblies in vibratory environment.

Due to the power in crease of new aircraft engines and the extended service life of existing aircraft, vibration levels around engines are becoming extremely strong (about 25g). Temperatures can also reach up to 550°C. Systems surrounding engine zones are therefore submitted to new and extreme environmental constraints. Even if the tendency is to develop more electrical aircraft, most of the aircraft developed today, based on bleed systems, will still be in use in the next 20 years and their issues have to be solved. Today, bearings design and materials have reached their limit.

In order to propose innovative solutions answering the new requirements, BEARINGS need to:
i) better understand the degradations encountered, using recent advances in contact modelling
ii) propose innovative materials (bulk, smart sintered, nano materials) and adapted processes,
iii) propose relevant bearings designs.

In the competition with United States (and Japan for bearings suppliers), BEARING is a unique opportunity to maintain European Air Systems and Bearings suppliers leadership by offering a superior and affordable European technology, which supports an invaluable strategic advantage for European air-framers and airliners.

Call for proposal

FP6-2005-AERO-1
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Funding Scheme

STREP - Specific Targeted Research Project

Coordinator

LIEBHERR AEROSPACE TOULOUSE
Address
408 Avenue Des Etats-unis
Toulouse
France

Participants (10)

PRVNI BRNENSKA STROJIRNA VELKA BITES, A.S.
Czechia
Address
Vlkovska 279
Velka Bites
SKF AEROSPACE FRANCE
France
Address
1 Avenue Marc Seguin
Saint Vallier
THE PROVOST, FELLOWS AND SCHOLARS OF THE COLLEGE OF THE HOLY AND UNDIVIDED TRINITY OF QUEEN ELIZABETH NEAR DUBLIN
Ireland
Address
College Green
Dublin
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
Hungary
Address
Müegyetem Rkp. 3-9
Budapest
CONSORZIO PER LO SVILUPPO DEI SISTEMI A GRANDE INTERFASE - CSGI
Italy
Address
Via Della Lastruccia 3
Sesto Fiorentino (Fi)
MBN NANOMATERIALIA S.P.A.
Italy
Address
Via G. Bortolan 42
Vascon Di Carbonera (Tv)
ARC SEIBERSDORF RESEARCH GMBH
Austria
Address
Donau-city-strausse 1-Techgate
Wien
INSTYTUT OBROBKI PLASTYCZNEJ (METAL FORMING INSTITUTE)
Poland
Address
Jana Pawla Ii No 14
Poznan
PYROGENESIS SA
Greece
Address
Technological Park Of Lavrion, 1 Lavrion Ave.
Lavrion
INSTITUT NATIONAL DES SCIENCES APPLIQUÉES DE LYON
France
Address
20 Avenue Albert Einstein
Villeurbanne Cedex