Abstract
Acoustic attenuation of a hybrid sonic crystal made with periodic cylindrical scatterers and cascaded porous panels in a broad frequency range is endeavoured in this paper. It is observed via simulations that, the insertion loss (IL) of hybrid configuration is larger than the summation of IL of individual contributors such as periodic scatterers and parallel porous panels in post first Bragg resonance frequency band. The key finding of the research is that the passband in post first Bragg resonance is turning to stopband on introducing the cascaded porous panels within scatterers. Other configurations such as periodic array of cylindrical scatterers in series with porous panels in upstream, downstream and bounded with porous panels are examined and compared. The potential of said claim is shown by investigating a multi-resonant array of scatterers with cascaded porous panels. Finally, the experimental results are presented to authenticate the observed findings of simulations.
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Appendix 1: Validation of simulation
Appendix 1: Validation of simulation
In order to validate the simulation results, an array of infinitely periodic cylindrical scatterers is taken from literature for investigation [7]. There are five rows of scatterers, where the diameter of the scatterer is \(d_{2} =\) 0.6 m, lattice constant is \(d_{1}\) = 0.2 m. The calculated IL is shown in Fig. 9a. Next, the melamine foam of 75 mm thickness is modelled using JCA model and validated both calculated and measured results with simulation [20]. The material properties of the foam are taken as (\(\sigma ) =\) 8432 Pa s/m2, porosity \(\left( {{ }\varphi } \right)\) = 0.99, tortuosity \(\left( \alpha \right)\) = 1.02, viscous characteristic length \(\left( {\Lambda } \right)\) = 138e−6 m, thermal characteristic length \(({{\Lambda^{\prime}}}\)) = 154e−6 m. The calculated absorption coefficient is shown in Fig. 9b. From figure, it can be perceived that the suggested simulations are adequate and reliable to examine proposed hybrid sonic crystal which is made with periodic scatterers and porous panels.
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Mohapatra, K., Jena, D.P. Acoustic Attenuation of Hybrid Sonic Crystal Made with Periodic Cylindrical Scatterers and Porous Panels. Acoust Aust 49, 441–449 (2021). https://doi.org/10.1007/s40857-021-00239-0
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DOI: https://doi.org/10.1007/s40857-021-00239-0