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  1. mrjonadam

    Rotating Shaft Critical Speed

    I have a rotating hollow shaft and I'm assuming a fixed end condition. I'm looking for the critical(whirling) speed. Right now I'm using the following equation: Nc = (3.57*sqrt(EI/m))/L^2 where, E = Young's modulus (lb/in^2) I = second moment of area (in^4) m = mass per unit...

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