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Vibration isolation on light weight floor

Hammer, Per LU and Brunskog, Jonas LU (2002) In Building Acoustics 9(4). p.257-269
Abstract
A theoretical and experimental study of vibration isolation for a source on a lightweight floor structure is presented. The effectiveness of one-stage and two-stage isolator systems is studied. Approximate formulae are presented for both low and high frequency for the receiver, the floor structure. For the mobility, a comparison between approximate formulae, numerical exact results and experimental results are presented. The low frequency asymptote for the approximate mobility is valid up to l/p 1/4. The high frequency asymptote is valid from l/p 1/2. A straight line can be drawn between these two points for the intermediate range 1/4 < l/p < 1/2. Finally, a case study is presented. A fan is mounted on a wooden joist floor. The... (More)
A theoretical and experimental study of vibration isolation for a source on a lightweight floor structure is presented. The effectiveness of one-stage and two-stage isolator systems is studied. Approximate formulae are presented for both low and high frequency for the receiver, the floor structure. For the mobility, a comparison between approximate formulae, numerical exact results and experimental results are presented. The low frequency asymptote for the approximate mobility is valid up to l/p 1/4. The high frequency asymptote is valid from l/p 1/2. A straight line can be drawn between these two points for the intermediate range 1/4 < l/p < 1/2. Finally, a case study is presented. A fan is mounted on a wooden joist floor. The effect of both one and two stage isolation is demonstrated. It is clearly seen that the high mobility situation for the receiver is increased by adding a rigid body to the mount. Hence, in the frequency range of interest, the 'receiver' acts more or less as a blocked termination. A two-stage isolator almost completely eliminates the structure borne sound and compared to a one-stage isolator it reduces the sound by 20 dB at the rpm for the fan. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Building Acoustics
volume
9
issue
4
pages
257 - 269
publisher
Multi-Science Publishing
language
English
LU publication?
yes
id
09c83e42-f522-42ca-9f17-e7bd39a70b03 (old id 929843)
alternative location
http://www.ingentaconnect.com/
date added to LUP
2008-01-27 08:05:44
date last changed
2016-10-05 15:27:10
@article{09c83e42-f522-42ca-9f17-e7bd39a70b03,
  abstract     = {A theoretical and experimental study of vibration isolation for a source on a lightweight floor structure is presented. The effectiveness of one-stage and two-stage isolator systems is studied. Approximate formulae are presented for both low and high frequency for the receiver, the floor structure. For the mobility, a comparison between approximate formulae, numerical exact results and experimental results are presented. The low frequency asymptote for the approximate mobility is valid up to l/p 1/4. The high frequency asymptote is valid from l/p 1/2. A straight line can be drawn between these two points for the intermediate range 1/4 &lt; l/p &lt; 1/2. Finally, a case study is presented. A fan is mounted on a wooden joist floor. The effect of both one and two stage isolation is demonstrated. It is clearly seen that the high mobility situation for the receiver is increased by adding a rigid body to the mount. Hence, in the frequency range of interest, the 'receiver' acts more or less as a blocked termination. A two-stage isolator almost completely eliminates the structure borne sound and compared to a one-stage isolator it reduces the sound by 20 dB at the rpm for the fan.},
  author       = {Hammer, Per and Brunskog, Jonas},
  language     = {eng},
  number       = {4},
  pages        = {257--269},
  publisher    = {Multi-Science Publishing},
  series       = {Building Acoustics},
  title        = {Vibration isolation on light weight floor},
  volume       = {9},
  year         = {2002},
}