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A 400 lb duct is to be hung from a ceiling. 30 dB of isolation is desired at all frequencies greater than 100 Hz. Determine the desired stiffness, and static deflection of each isolator spring if four springs are to be used. Note we have no damping and we can assume all four springs are equally loaded. In addition, dB = 10 log10 (1/Rd). Determine the percent isolation.

A 400 lb duct is to be hung from a ceiling. 30 dB of isolation is desired at all frequencies greater than 100 Hz. Determine the desired stiffness, and static deflection of each isolator spring if four springs are to be used. Note we have no damping and we can assume all four springs are equally loaded. In addition, dB = 10 log10 (1/Rd). Determine the percent isolation.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A 400 lb duct is to be hung from a ceiling. 30 dB of isolation is desired at all frequencies greater than 100 Hz. Determine the desired stiffness, and static deflection of each isolator spring if four springs are to be used. Note we have no damping and we can assume all four springs are equally loaded. In addition, dB = 10 log10 (1/Rd). Determine the percent isolation.
Transcribed Image Text:A 400 lb duct is to be hung from a ceiling. 30 dB of isolation is desired at all frequencies greater than 100 Hz. Determine the desired stiffness, and static deflection of each isolator spring if four springs are to be used. Note we have no damping and we can assume all four springs are equally loaded. In addition, dB = 10 log10 (1/Rd). Determine the percent isolation.
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