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A perfectly balanced motor with its shaft has a mass of 18 kg , and a 2 kg disc is fixed onto the shaft, with eccentricity, e. The motor is mounted on an 180 kg platform supported by rubber mountings. The equivalent stiffness of the mountings is 1.5 x 10' N/m , and the equivalent damping is 3 x10* Ns/m. When the motor is running at a rotational speed of 3000 rpm, it was found that the steady state amplitude of vibration is 0.2 mm.

A perfectly balanced motor with its shaft has a mass of 18 kg , and a 2 kg disc is fixed onto the shaft, with eccentricity, e. The motor is mounted on an 180 kg platform supported by rubber mountings. The equivalent stiffness of the mountings is 1.5 x 10' N/m , and the equivalent damping is 3 x10* Ns/m. When the motor is running at a rotational speed of 3000 rpm, it was found that the steady state amplitude of vibration is 0.2 mm.

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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Topic: Mechanics of Machines & Vibrations \ Damped System under Sinusoidal Excitation
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m=2 kg ; eccentricity, e 14.2) A perfectly balanced motor with its shaft has a mass of 18 kg , and a 2 kg disc is fixed onto 18 kg the shaft, with eccentricity, e. The motor is mounted on an 180 kg platform supported by 180 kg rubber mountings. The equivalent stiffness of the mountings is 1.5 x 10' N/m , and the equivalent damping is 3 x10*Ns/m. When the motor is running Keg= 1.5 x10' N/m Ce-3 x104Ns/m at a rotational speed of 3000 rpm, it was found that the steady state amplitude of vibration is 0.2 mm. FIG. Q14. 2 Find: a) The eccentricity, e , of the disc. b) The magnitude of the force that is transmitted to the floor Ans : e = F:=
Transcribed Image Text:m=2 kg ; eccentricity, e 14.2) A perfectly balanced motor with its shaft has a mass of 18 kg , and a 2 kg disc is fixed onto 18 kg the shaft, with eccentricity, e. The motor is mounted on an 180 kg platform supported by 180 kg rubber mountings. The equivalent stiffness of the mountings is 1.5 x 10' N/m , and the equivalent damping is 3 x10*Ns/m. When the motor is running Keg= 1.5 x10' N/m Ce-3 x104Ns/m at a rotational speed of 3000 rpm, it was found that the steady state amplitude of vibration is 0.2 mm. FIG. Q14. 2 Find: a) The eccentricity, e , of the disc. b) The magnitude of the force that is transmitted to the floor Ans : e = F:=
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