Noise Attenuation of a Duct-resonator System Using Coupled Helmholtz Resonator - Thin Flexible Structures

Iwan Prasetiyo; Gradi Desendra; Khoerul Anwar; Mohammad Kemal Agusta

doi:10.5614/j.eng.technol.sci.2021.53.6.5

Authors

Iwan Prasetiyo KK-Fisika Bangunan Fakultas Teknologi Industri - Institut Teknologi Bandung
Gradi Desendra Engineering Physics, Faculty of Industrial Technology, Institut Teknologi Bandung Jalan Ganesa 10, Bandung 40132, Indonesia
Khoerul Anwar Engineering Physics, Faculty of Industrial Technology, Institut Teknologi Bandung Jalan Ganesa 10, Bandung 40132, Indonesia
Mohammad Kemal Agusta Engineering Physics, Faculty of Industrial Technology, Institut Teknologi Bandung Jalan Ganesa 10, Bandung 40132, Indonesia

DOI:

https://doi.org/10.5614/j.eng.technol.sci.2021.53.6.5

Keywords:

acoustic attenuator, Bragg reflection, duct system, Helmholtz resonator, periodic structure, membrane, thin flexible structure

Abstract

Several studies have been devoted to increasing the attenuation performance of the Helmholtz resonator (HR). One way is by periodic coupling of HRs in a ducting system. In this study, we propose a different approach, where a membrane (or a thin flexible structure in general) is added to the air cavity of a periodic HR array in order to further enhance the attenuation by utilizing the resonance effect of the membrane. It is expected that three attenuation mechanisms will exist in the system that can enhance the overall attenuation, i.e. the resonance mechanism of the HR, the Bragg reflection of the periodic system, and the resonance mechanism of the membrane or thin flexible structure. This study found that the proposed system yields two adjacent attenuation peaks, related to the HR and the membrane respectively. Moreover, extension of the attenuation bandwidth was also observed as a result of the periodic arrangement of HRs. With the same HR parameters, the peak attenuation by the membrane is tunable by changing its material properties. However, such a system does not always produce a wider attenuation bandwidth; the resonance bandwidths of both mechanisms must overlap.

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