Effects of vibration isolation on structure-borne sound transmission

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Effects of vibration isolation on structure-borne sound transmission

 

Author: Tsui, Kok-tim
Title: Effects of vibration isolation on structure-borne sound transmission
Degree: M.Sc.
Year: 2002
Subject: Hong Kong Polytechnic University -- Dissertations
Architectural acoustics
Sound -- Transmission
Buildings -- Vibration
Structural dynamics -- Noise
Department: Multi-disciplinary Studies
Dept. of Building Services Engineering
Pages: x, 94, [19] leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1661039
URI: http://theses.lib.polyu.edu.hk/handle/200/2947
Abstract: This study is an investigation on the effects of vibration on the transmission of structure-borne sound in a building. The main objectives are 1) to study the natural frequencies of the system, 2) to study the correlation between the force/moment at the machine supports and the sound transmission and 3) to study the effects of in-plane forces and moments on the structural vibration and sound transmission. Most of the building services engineering systems are the machines which are installed in mechanical plant rooms. All of these machines produce vibration as they contain unbalanced rotating shafts. Examples are pumps, fans, motors, etc. The unsteady forces and moments created at the machine supports cause floor vibration and result in generation of structure-borne sound, which propagate throughout the building into rooms far away from the vibration source. One of the most effective means of reducing the transmission of such objectionable vibrations from the mechanical plant roam to adjacent structures is vibration isolation. This process reduces the magnitudes of the forces acting on the supports and thus lowers the level of the structure-borne sound. Though there has been research in the prediction of structure-borne sound level by statistical models, little has been done on the effects of in-plane forces and moments on the structure-borne sound transmission. In this project, a physical model is used to simulate the most common situation in a mechanical plant room. The results from this study will be useful to design engineers concern with building noise and vibration control.

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