Abstract
Helmholtz resonator is generally used to reduce the low frequency noise. However, it has only high transmission loss in a narrow band at the resonance frequency. In order to obtain broad band transmission loss, studies of a silencer using various resonator arrays have been carried out. These previous studies have been limited to low incident sound pressure level conditions with no change of impedance with respect to pressure. In the case of high sound pressure, the resistance increases due to nonlinear behavior at the neck of a resonator. As a result, the desired noise reduction performance cannot be achieved due to the transmission loss decrease. To predict the transmission loss of a silencer using resonator arrays at high sound pressure level, impedance variation depending on the incident sound pressure level should be considered. Furthermore, resonator’s numbers and order of arrangement are significant design parameters for design of transmission loss shape.
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Recommended by Associate Editor Junhong Park
Sang-Hyeon Seo received his B.S. degree in the Mechanical Engineering from the Korea University in 2002 and the M.S. degree in the Mechanical Engineering from the KAIST in 2004. He is currently a Ph.D. candidate in the Mechanical Engineering in the KAIST. His research interests include the noise reduction and duct acoustics.
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Seo, SH., Kim, YH. & Kim, KJ. Transmission loss of a silencer using resonator arrays at high sound pressure level. J Mech Sci Technol 30, 653–660 (2016). https://doi.org/10.1007/s12206-016-0119-4
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DOI: https://doi.org/10.1007/s12206-016-0119-4