Soundproofing: The diminishing effect of media on sound intensity and resonance modes

Authors

DOI:

https://doi.org/10.14288/cjur.v4i1.189761

Keywords:

sound insulator, resonance, reduction

Abstract

The aim of the present experiment was to study the transmission of sound through a building by means of replicating a small-scale model of a floor and ceiling apparatus. Therefore, the relationship between input sine wave frequency and sound intensity through a closed apparatus was analyzed. The sound absorbance of various sound insulating materials was compared, and resonance properties of the apparatus was also considered. Sound intensity trends were investigated for frequencies within the human hearing range (up to the order of magnitude of 10,000 Hz), and different soundproofing material types (porous absorbers and resonators) were compared. It appears that the input sound wavelength (relative to the container size), as well as sound absorption coefficient were both major factors in transmitted sound’s intensity. Porous absorbers were found to be the most robust material type at both resonance and non-resonance modes, and the optimal soundproofing material was the stone wool insulator (Material 2).

Author Biographies

Roberto Fedrigo, Department of Physics and Astronomy, The University of British Columbia

Roberto Fedrigo is a 2nd-year Honours in Biophysics student.

Peter Quigley, Department of Physics and Astronomy, The University of British Columbia

Peter Quigley is a 2nd-year Combined Honours in Physics and Astronomy student.

References

Encyclopaedia Britannica (1998). Huygens’ principle.

https://www.britannica.com/science/Huygens-principle. Accessed March 25, 2017.

Georgia State University (2000a). Speed of sound in air. Hyperphysics. http://hyperphysics.phyastr.gsu.edu/hbase/Sound/souspe.html. Accessed March 09, 2017.

Hawkins, K. (2014). Studies and research regarding sound reduction materials with the purpose of reducing sound pollution. Cal. Polytechnic State Uni. USA 1, 1 – 41.

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Published

2019-02-08

Issue

Vol. 4 No. 1 (2019): CJUR 4(1)

Section

Articles

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