Numerical simulation of the effect of absorption on the transmission of acoustic waves through 3D-printed ABS-plastic metamaterial

Abstract

When designing acoustic metamaterials, there is often a discrepancy between the calculated sound field and the experimental results. This does not allow you to accomplish the planned purposes, for example, using a metamaterial as a filter in a given frequency range. One of the reasons for this is associated with the effect of losses, which is often not considered. This paper presents the results of numerical simulation of effect of absorption on the acoustic waves propagation in metamaterial elements. Samples in the form of cubes with holes made of 3D-printed ABS-plastic were used as simulation. The attenuation coefficients were taken from the literature and measured in the samples of plastic the metamaterial was made of. Full-wave numerical simulation by the finite element method in the COMSOL Multiphysics software package is performed. Simulation allowed to analyze many different geometries and physical parameters of metamaterial samples and to choose ones with the most designatory properties. The effect of absorption on a number of features, in particular, on the pattern of the bandwidth and reject bands is noted. Numerical and physical experiments are compared. [The research was supported by a grant from the Russian Science Foundation (Project No. 19-12-00098).]