Hi, I'm after a bit of assistance with a calculation for a wind turbine generator bearing. I have performed the calculation by hand for other plant before, but obviously the wind turbine operates at a constantly varying RPM, and despite contacting SKF and searching every handbook and engineering reference in my library I still can't find a guideline on where to start with anything other than a calc for constant RPM. Even SKF say they just plug the numbers into various 'bins' on their system and a life is provided.
Any experience with working this out by hand? Any references online worth checking out?
Many thanks in advance,
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