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If the damper is not provided and the system is...

If the damper is not provided and the system is in resonance, which of the following is the correct isolation factor?

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+1 vote

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

If the damper is not provided and the system is in resonance, which of the following is the correct isolation factor?

(a) 0

(b) 1/2

(c) 1/4

(d) Infinity

The question was asked in an online interview.

Question is taken from Vibration Isolation and Transmissibility in section Torsional Vibrations of Machine Dynamics

machine dynamics
torsional vibrations
vibration isolation and transmissibility

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1 Answer

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

Right answer is (d) Infinity

Best explanation: When the damper is not involved, the damping coefficient c becomes zero and isolation factor is given by:

1/(1-(ω/ωn))

Since during resonance, ω=ωn

isolation factor becomes infinite.

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