Possible solutions to impossible bearing problems in marine energy

Date: 2014-03-20T13:00:00
Location: Edinburgh
Presenter: Stephen Salter, Professor Emeritus, University of Edinburgh
Conference: SKF Ocean Energy technology Day


Even with the protection offered by spine deflections in extreme waves, the main bearing of the Edinburgh long-spine duck has to take alternating radial loads of 50 Meganewtons at velocities of 2 metres per second. It must work unsealed in biologically-active sea water. It must have low friction and a life of 25 years. The bearing parts are slip-formed concrete with a manufacturing tolerance of at least 100 mm with as much movement again due to the working loads which make the spine go oval. The bearing for the 200 metre diameter Edinburgh vertical-axis tidalstream bearing has to take similar loads for a large fraction of the time in both radial and axial directions at velocities of 8 metres per second and with a similar life. It also forms part of a 200 MW power-conversion system going from a variable input speed to synchronous generation in-phase with the land grid. This paper will offer solutions.

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