Computer Science – Performance
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.591..261l&link_type=abstract
In: Proceedings of the 11th European Space Mechanisms and Tribology Symposium, ESMATS 2005, 21-23 September 2005, Lucerne, Switz
Computer Science
Performance
3
Mechanisms Components
Scientific paper
This paper describes a new technology development known as a Bearing Active Preload System (BAPS) which permits ball bearing preload variation on command. There are numerous bearing performance and system design benefits which can be realised by this technology, including order of magnitude improvements both in bearing lifetime and in mean torque/power consumption in flight. The evolution of the concept, which allows preload to be set at a high level or a low level as little as 10% of the high level is described. Also included are examples of test data from the first two hardware units, a demonstrator and breadboard model (BBM). These results suggest that the BAPS has negligible effect on bearing alignment and that stiffness and mass are also in-line with requirements for such a device. It is envisaged that ultimately in a flight configuration, the BAPS will be supplied as a "bearing cartridge" which for a bi-stable unit is actuated by an SMA bender.
Humphries Martin E.
Lewis S. D.
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