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Bearing with Minimum Lubrication

Objective


- A new cage windage model was developed from the test conducted on a new test rig.

The development of this new rig and its capabilities to reproduce the different lubrication environments of roller and ball bearings permitted to achieve one of the most important task of the project.

- The new bearing codes have been developed and validated such that bearing designers have new efficient tools to adapt the geometry for low friction consideration.

The exploitation of these results let the designer to modify the geometry to further decrease internal friction.

Therefore future applications will benefit of lower heat rejection and better reliability.

For example, a 800 kW turbine engine which bearing designs are reviewed with these codes will reduce the power dissipation of a magnitude estimated at 3 kW (based on a 6 bearings assembly on the main shafts).
The heat sources inside bearings will be evaluated to show areas of potential weakness and to demonstrate possible methods of improvement.
Provide to the chosen University a summary of overall heat generation data from previous testing at the various participating engine companies.
Development of a new analytical model for predicting heat generation at the early stage of an engine design. This model is to predict heat as a summation of the various mechanisms, for ball and roller bearings.
Extension of an analytical model to achieve force and power balance for bearings and hence predict the equilibrium speed of cage.
Perform tests on new rig at University to provide basic data for calibration of windage drag of cage and ball or roller assembly and build a mathematical model.
Set up tests of bearings, appropriate to needs of each engine Company, to measure heat generation.
Provide data to the University to compare with predictions from model.
Calibrate model to match engine company test data.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

TURBOMECA SA
Address
Avenue Du President Szydlowski
Bordes
France

Participants (9)

BMW Rolls-Royce GmbH - Aeroengines
Germany
Address
Hohemarkstraße 60-70
61440 Oberursel
Fundação Gomes Teixeira da Universidade do Porto
Portugal
Address
40,Rua Dos Bragas 40
4099 Porto
GLCS
France
Address
47 Boulevard Chanzy
93100 Montreuil-sous-bois
HISPANO-SUIZA SA
France
Address
Boulevard Louis Seguin, 18
Colombes
Institut National des Sciences Appliquées de Lyon (INSA)
France
Address
20 Avenue Albert Einstein
69621 Villeurbanne
MTU AERO ENGINES GMBH
Germany
Address
Dachauer Strasse, 665
Muenchen
Rolls Royce plc
United Kingdom
Address
65 Buckingham Gate
SW1E 6AT London
Société Nationale d'Études et de Construction de Moteurs d'Aviation (SNECMA)
France
Address
2 Boulevard Du Général Martial Valin
75724 Paris
UNIVERSITY OF LEEDS
United Kingdom
Address
Woodhouse Lane
LS2 9JT Leeds