- 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 SchemeCSC - Cost-sharing contracts
SW1E 6AT London
LS2 9JT Leeds