2020/10/12 by Abhishek Gautam, Gautam, Abhishek, Alper Celik +3
Engineering · #Acoustic Wave Phenomena Research #Aerodynamics and Acoustics in Jet Flows #Applied Physics (physics.app-ph) #Engineering Applied Research #FOS: Physical sciences
paper · pdf · doi:10.48550/arxiv.2010.05908
openalex publication_date 2020/10/12 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
The effect of neck extensions in single and multi-degree of freedom Helmholtz\nresonator based acoustic liners is studied both experimentally and numerically\nand the resulting transmission coefficient and resonance frequencies are\nexamined. It has been shown that a single degree of freedom liner with\nincreasing neck extension lengths leads to the resonance frequencies being\npushed to lower frequency values, however, this shift to lower frequencies is\nnot linear with increasing length. A study on including neck extensions for the\nprimary and/or secondary neck within a double degree of freedom liner is also\npresented. It is shown that both neck extension concepts lead to an increase in\nbandwidth of sound absorption by a double degree of freedom Helmholtz\nresonator.\n