A rotating machine of mass M = 100 kg has an unbalanced mass m = 0.2 kg a dis- tance r = 0.5 m from the center of rotation. (The mass M includes mass m.) The oper- ating speed is 10 Hz. Suppose that the machine is mounted on an isolator consisting of a spring and damper, as shown in Figure 9-43. If it is desired that g be 0.2, specify the spring constant k such that only 10% of the excitation force is transmitted to the foun- dation. Determine the amplitude of the transmitted force.

A rotating machine of mass M = 100 kg has an unbalanced mass m = 0.2 kg a dis- tance r = 0.5 m from the center of rotation. (The mass M includes mass m.) The oper- ating speed is 10 Hz. Suppose that the machine is mounted on an isolator consisting of a spring and damper, as shown in Figure 9-43. If it is desired that g be 0.2, specify the spring constant k such that only 10% of the excitation force is transmitted to the foun- dation. Determine the amplitude of the transmitted force.

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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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

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Problem B-9-7
A rotating machine of mass M = 100 kg has an unbalanced mass m = 0.2 kg a dis-
tance r = 0.5 m from the center of rotation. (The mass M includes mass m.) The oper-
ating speed is 10 Hz. Suppose that the machine is mounted on an isolator consisting of
a spring and damper, as shown in Figure 9-43. If it is desired that 3 be 0.2, specify the
spring constant k such that only 10% of the excitation force is transmitted to the foun-
dation. Determine the amplitude of the transmitted force.
Figure 9–43 Rotating machine mounted
on a vibration isolator.

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