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The factor which affects the critical speed of a...

The factor which affects the critical speed of a shaft is

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asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

The factor which affects the critical speed of a shaft is

(a) diameter of the disc

(b) span of the shaft

(c) eccentricity

(d) all of the mentioned

This question was addressed to me during an online exam.

I would like to ask this question from Vibratory Motion in section Longitudinal and Transverse Vibrations of Machine Dynamics

machine dynamics
longitudinal and transverse vibrations
vibratory motion

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answered Oct 16, 2022 by Fred (38.6k points)

Right choice is (d) all of the mentioned

Easiest explanation: To determine the critical speed of a shaft which may be subjected to point loads, uniformly distributed load or combination of both, we find the frequency of transverse vibration which is equal to critical speed of a shaft in r.p.s. The Dunkerley’s method may be used for calculating the frequency.

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