Parametric analysis of sound transmission loss in a rectangular duct attached with resonator silencer
Noise is an existing problem that exist in the environments produced from vibrating sources. In general, the common solutions for noise control are: (1) redesigning the system the system for instance increasing wall thickness or stiffening structures, and (2) adding additional damping in acous...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Penerbit UINMAP
2022
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7715/1/J14569_fc542fe4cba9dc2fe9a82acd1473a093.pdf http://eprints.uthm.edu.my/7715/ |
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| Summary: | Noise is an existing problem that exist in the environments produced from vibrating sources.
In general, the common solutions for noise control are: (1) redesigning the system the system
for instance increasing wall thickness or stiffening structures, and (2) adding additional
damping in acoustic systems to dissipate sound energy such as the use of resonator silencers.
However, the latter is more practical because it does not concern about the complexity of the
design and modification cost. In this paper, the application of a single resonator silencer to
reduce sound pressure levels and increase transmission loss of a rectangular duct is
investigated. The application is further expanded by attaching multiple resonator silencers
to study its efficiency. Two types of resonator silencers were analyzed namely quarter
wavelength tube (QWT) and Helmholtz resonator (HR), where the sound pressure level and
transmission loss were determined by finite element analysis using ANSYS. The first
outcomes show that a single HR displays more efficiency in the reduction of sound pressure
levels compared to a QWT over a wide frequency range. Subsequently, as the number of
resonator silencers increased, the transmission loss was found increase with the sound
pressure level decreased simultaneously. Overall, it can be concluded that HR is more
effective over a wide frequency range and multiple resonator silencers can increase the
transmission loss of rectangular duct. |
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