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1. A building exhaust fan for a large commercial building weighs 180 pounds and operates at a speed of 600 rpm. Due to manufacturing tolerances, it may have a rotating imbalance. It is desired to limit force transmissibility to 2.5 as the fan passes through resonance during startup and wind-down. In addition, an Isolation of 90% is required at the operating speed of the fan. The fan's framework will be supported from the floor at 4 corners. Design, select, and specify vibration isolators at the four corners. It is acceptable to assume the center of gravity is symmetrical with respect to all four corners, enabling you to treat this as a single DOF system without pitch or yaw.

1. A building exhaust fan for a large commercial building weighs 180 pounds and operates at a speed of 600 rpm. Due to manufacturing tolerances, it may have a rotating imbalance. It is desired to limit force transmissibility to 2.5 as the fan passes through resonance during startup and wind-down. In addition, an Isolation of 90% is required at the operating speed of the fan. The fan's framework will be supported from the floor at 4 corners. Design, select, and specify vibration isolators at the four corners. It is acceptable to assume the center of gravity is symmetrical with respect to all four corners, enabling you to treat this as a single DOF system without pitch or yaw.

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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1. A building exhaust fan for a large commercial bullding weighs 180 pounds and operates at a speed of 600 rpm. Due to manufacturing tolerances, it may have a rotating imbalance. It is desired to limit force transmissibility to 2.5 as the fan passes through resonance during startup and wind-down. In addition, an Isolation of 90% is required at the operating speed of the fan. The fan's framework will be supported from the floor at 4 corners. Design, select, and specify vibration isolators at the four corners. It is acceptable to assume the center of gravity is symmetrical with respect to all four corners, enabling you to treat this as a single DOF system without pitch or yaw.
Transcribed Image Text:1. A building exhaust fan for a large commercial bullding weighs 180 pounds and operates at a speed of 600 rpm. Due to manufacturing tolerances, it may have a rotating imbalance. It is desired to limit force transmissibility to 2.5 as the fan passes through resonance during startup and wind-down. In addition, an Isolation of 90% is required at the operating speed of the fan. The fan's framework will be supported from the floor at 4 corners. Design, select, and specify vibration isolators at the four corners. It is acceptable to assume the center of gravity is symmetrical with respect to all four corners, enabling you to treat this as a single DOF system without pitch or yaw.
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