Low Frequency Noise Attenuation through Extended Neck Double Degree of Freedom Helmholtz Resonators

Abhishek Gautam*, Alper Celik, Mahdi Azarpeyvand

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

21 Downloads (Pure)

Abstract

The use of acoustic liners, based on double-degree-of-freedom Helmholtz resonators, for low-frequency-noise attenuation is limited by the volume of individual resonating cavities. This study investigates the effect of the septum neck length on the acoustic performance of double-degree-of-freedom resonators, both experimentally and numerically, for varying cavity volume ratios. The underlying sound attenuation mechanism is studied by analysing the acoustic pressure fields within the resonator cavities. An increase in the septum neck is shown to lower the frequencies affected by the resonator. In addition, it deteriorates and significantly improves the sound attenuation performance at the primary and secondary peak transmission-loss frequencies, respectively.
Original languageEnglish
Pages (from-to)1123-1135
Number of pages13
JournalAcoustics
Volume5
Issue number4
Early online date3 Dec 2023
DOIs
Publication statusE-pub ahead of print - 3 Dec 2023

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