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Improvement of Noise Attenuation in a Duct Using Two Helmholtz Resonators


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DOI: https://doi.org/10.15866/ireme.v9i3.5596

Abstract


The paper consists of a thorough numerical investigation of the resonance frequency and the transmission loss due to two different frequency 1-DOF Helmholtz resonators attached to a duct for attenuating low frequency noise. The optimum relative spacing and orientation between the two resonators was found out numerically using finite element method. The investigation was further carried out by changing the geometry of the cavity and neck at the optimum relative spacing. Finally, an optimized system of two different 1-DOF Helmholtz resonators has been demonstrated here on the basis of several investigations of relative spacing, orientation and geometry. A significant improvement in overall noise attenuation was observed while compared to a single 1-DOF Helmholtz resonator of a published study. A validation was performed for a single 1-DOF resonator and good agreement between the analytical and numerical results was obtained.
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Keywords


1-DOF; Finite Element Method; Helmholtz Resonator; Noise Attenuation; Resonance Frequency; Transmission Loss

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References


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