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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| Format: | Final Year Project |
| Language: | English |
| Published: |
2017
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/72286 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | 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. |
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