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HS-APT06

Acoustic Absorption Capabilities of Various Easily Available Resonators

Applied Technology
Zach Dye

Grade:
10
Teacher:
Elyse Wexler

Noise is a leading type of pollution and causes many detrimental health impacts, therefore it is essential to find materials that effectively dampen sound within human habitats. In order to expand the availability of noise dampening, easily available materials should be tested for maximum noise reduction efficacy. Prior studies have focused on lab created item experimenting with density, cell structure, and cell size, or recycles materials not specifically intended for sound absorption. This experiment sought to test the sound absorption capabilities of easily available, already made materials at three common frequencies. Using a noise impedance tube, in which a speaker is placed at one end of a tube while a decibel reader is placed at the other and materials are placed bisecting the tube, five different materials were tested for their sound reducing capability. Despite previous research suggesting large cell size would have increased dampening effects, the acoustic ceiling tile followed by ordinary cardboard were the most effective sound absorbers across all frequencies, while Styrofoam actually amplified sound at high frequency. Acoustic tile and especially cardboard are inexpensive, easily available materials that could be used in homes and commercially across the world to reduce the harmful effects of excessive noise.


Project presentation

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Lab journal excerpts

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Research paper

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One thought on “Acoustic Absorption Capabilities of Various Easily Available Resonators

  1. You’ve got the mind of a scientist… very structured in your thinking as to how to prove your hypothesis, with a very controlled experiment of the materials. there is no doubt your results are valid and credible. well done!

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