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A counterrotating eccentric mass exciter shown in Fig. P3.13 is used to determine the vibrational characteristics of a structure of mass 181.4 kg. At a speed of 900 rpm, a stro- boscope shows the eccentric masses to be at the top at the instant the structure is moving upward through its static equilibrium position, and the corresponding amplitude is 21.6 mm. If the unbalance of each wheel of the exciter is 0.0921 kg m, determine (a) the nat- ural frequency of the structure, (b) the damping factor of the structure, (c) the amplitude at 1200 rpm, and (d) the angular position of the eccentrics at the instant the structure is moving upward through its equilibrium position.

A counterrotating eccentric mass exciter shown in Fig. P3.13 is used to determine the vibrational characteristics of a structure of mass 181.4 kg. At a speed of 900 rpm, a stro- boscope shows the eccentric masses to be at the top at the instant the structure is moving upward through its static equilibrium position, and the corresponding amplitude is 21.6 mm. If the unbalance of each wheel of the exciter is 0.0921 kg m, determine (a) the nat- ural frequency of the structure, (b) the damping factor of the structure, (c) the amplitude at 1200 rpm, and (d) the angular position of the eccentrics at the instant the structure is moving upward through its equilibrium position.

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
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A counterrotating eccentric mass exciter shown in Fig. P3.13 is used to determine the vibrational characteristics of a structure of mass 181.4 kg. At a speed of 900 rpm, a stro- boscope shows the eccentric masses to be at the top at the instant the structure is moving upward through its static equilibrium position, and the corresponding amplitude is 21.6 mm. If the unbalance of each wheel of the exciter is 0.0921 kg m, determine (a) the nat- ural frequency of the structure, (b) the damping factor of the structure, (c) the amplitude at 1200 rpm, and (d) the angular position of the eccentrics at the instant the structure is moving upward through its equilibrium position. M CE
Transcribed Image Text:A counterrotating eccentric mass exciter shown in Fig. P3.13 is used to determine the vibrational characteristics of a structure of mass 181.4 kg. At a speed of 900 rpm, a stro- boscope shows the eccentric masses to be at the top at the instant the structure is moving upward through its static equilibrium position, and the corresponding amplitude is 21.6 mm. If the unbalance of each wheel of the exciter is 0.0921 kg m, determine (a) the nat- ural frequency of the structure, (b) the damping factor of the structure, (c) the amplitude at 1200 rpm, and (d) the angular position of the eccentrics at the instant the structure is moving upward through its equilibrium position. M CE
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