My Math Forum Speed of rotation.

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 February 19th, 2019, 02:16 AM #1 Member   Joined: Feb 2018 From: England Posts: 61 Thanks: 0 Speed of rotation. Hi All, How can I find of the speed of rotation without rpm or any speed? A bearing on a flywheel has a diameter of 28.0mm and axial length 18.0mm with a radial clearance of 14.4 micro m. The kinematic viscosity of the lubricating oil is 2.09 x 10^-5 m^2 S^-1 and the density is 835kg m^-3. If the power loss of the bearing is 1.34KW, how is it possible to calculate the rotation? I am unable to calculate the angular velocity and rotation rate without ω? ω = 2 πn/60 I have also tried using Petrov's equation Power loss - 2 πR³lw²/Cr. Any guidance would be appreciated. Last edited by skipjack; February 19th, 2019 at 05:17 PM.
 February 19th, 2019, 05:41 AM #2 Senior Member   Joined: Apr 2014 From: Glasgow Posts: 2,164 Thanks: 736 Math Focus: Physics, mathematical modelling, numerical and computational solutions I think Petroff's equation is the one to use here. Can you rearrange it to make the angular velocity the subject?
 February 19th, 2019, 12:20 PM #3 Member   Joined: Feb 2018 From: England Posts: 61 Thanks: 0 Hi Benit13, I was thinking the same but doubting myself its the wrong approach. I will try rearranging the equation, not an easy one is it. Many thanks.

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