Characteristics of sound interaction with materials

High volume sound is known to be damaging to the human ear but even frequencies that are insensitive to human ear possess potential hearing issues. This thesis aim to investigate the best possible material for passive sound attenuation at various octave center frequencies. By performing an experi...

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Main Author: Seow, Yong Jie
Other Authors: Lye Sun Woh
Format: Final Year Project
Language:English
Published: 2017
Subjects:
Online Access:http://hdl.handle.net/10356/72286
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-722862023-03-04T18:41:26Z Characteristics of sound interaction with materials Seow, Yong Jie Lye Sun Woh School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering High volume sound is known to be damaging to the human ear but even frequencies that are insensitive to human ear possess potential hearing issues. This thesis aim to investigate the best possible material for passive sound attenuation at various octave center frequencies. By performing an experiment with three materials (steel sheet, 2 –ply cardboard and acoustic foam) varied against four different frequencies (250, 500, 2000, 4000 Hz), their sound attenuation performance was noted and eventually analyzed against a composite material (dual material composite) configuration of materials. The steel sheet and foam configuration proved to be most effective, followed by the cardboard and steel sheet configuration. Results shows that composite materials do not sum up their sound attenuation effectiveness but instead follows a rule that relates to mass and stiffness of a material. Interestingly, other factors such as material structure and air gap affects the effectiveness significantly. Different materials have been discovered to work well against low frequencies or high frequencies but a composite material is not the only answer to a well-rounded sound frequency attenuation barrier. Bachelor of Engineering (Mechanical Engineering) 2017-06-01T05:09:53Z 2017-06-01T05:09:53Z 2017 Final Year Project (FYP) http://hdl.handle.net/10356/72286 en Nanyang Technological University 58 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering
spellingShingle DRNTU::Engineering::Mechanical engineering
Seow, Yong Jie
Characteristics of sound interaction with materials
description High volume sound is known to be damaging to the human ear but even frequencies that are insensitive to human ear possess potential hearing issues. This thesis aim to investigate the best possible material for passive sound attenuation at various octave center frequencies. By performing an experiment with three materials (steel sheet, 2 –ply cardboard and acoustic foam) varied against four different frequencies (250, 500, 2000, 4000 Hz), their sound attenuation performance was noted and eventually analyzed against a composite material (dual material composite) configuration of materials. The steel sheet and foam configuration proved to be most effective, followed by the cardboard and steel sheet configuration. Results shows that composite materials do not sum up their sound attenuation effectiveness but instead follows a rule that relates to mass and stiffness of a material. Interestingly, other factors such as material structure and air gap affects the effectiveness significantly. Different materials have been discovered to work well against low frequencies or high frequencies but a composite material is not the only answer to a well-rounded sound frequency attenuation barrier.
author2 Lye Sun Woh
author_facet Lye Sun Woh
Seow, Yong Jie
format Final Year Project
author Seow, Yong Jie
author_sort Seow, Yong Jie
title Characteristics of sound interaction with materials
title_short Characteristics of sound interaction with materials
title_full Characteristics of sound interaction with materials
title_fullStr Characteristics of sound interaction with materials
title_full_unstemmed Characteristics of sound interaction with materials
title_sort characteristics of sound interaction with materials
publishDate 2017
url http://hdl.handle.net/10356/72286
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