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n electric motor with a mass of 260 kg and a rotating nbalance, is mounted near the end of a steel cantilever eam. The beam is observed to vibrate violently at the perating speed of 1200 rev/min of the motor. It is proposed o add a vibration absorber underneath the beam to reduce ne vibration. It is intended to have the lower frequency of ne combined system equal to 80 % of the operating speed of ne motor. etermine the ratio of the absorber mass to the mass of the notor. ind the mass and stiffness of the vibration absorber.

n electric motor with a mass of 260 kg and a rotating nbalance, is mounted near the end of a steel cantilever eam. The beam is observed to vibrate violently at the perating speed of 1200 rev/min of the motor. It is proposed o add a vibration absorber underneath the beam to reduce ne vibration. It is intended to have the lower frequency of ne combined system equal to 80 % of the operating speed of ne motor. etermine the ratio of the absorber mass to the mass of the notor. ind the mass and stiffness of the vibration absorber.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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An electric motor with a mass of 260 kg and a rotating unbalance, is mounted near the end of a steel cantilever beam. The beam is observed to vibrate violently at the operating speed of 1200 rev/min of the motor. It is proposed to add a vibration absorber underneath the beam to reduce the vibration. It is intended to have the lower frequency of the combined system equal to 80 % of the operating speed of the motor. Determine the ratio of the absorber mass to the mass of the (а) motor. Find the mass and stiffness of the vibration absorber. (b)
Transcribed Image Text:An electric motor with a mass of 260 kg and a rotating unbalance, is mounted near the end of a steel cantilever beam. The beam is observed to vibrate violently at the operating speed of 1200 rev/min of the motor. It is proposed to add a vibration absorber underneath the beam to reduce the vibration. It is intended to have the lower frequency of the combined system equal to 80 % of the operating speed of the motor. Determine the ratio of the absorber mass to the mass of the (а) motor. Find the mass and stiffness of the vibration absorber. (b)
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