Performance optimization of acoustic concentrator

Abstract

Acoustic concentrator, focusing acoustic field and enhancing acoustic energy in a region, is presented. The concentrating performances and the scattering properties of the acoustic concentrator with multilayered alternative homogeneous materials at different frequencies are investigated by the frequency response analysis with finite-element method (FEM). The calculation results show that it has an optimized relation between the acoustic concentrating performances in the inner region and the scattering properties in the outer region of these concentrators. A kind of acoustic concentrators constructed by an array of cylindrical rigid scatterers in fluid is proposed. The multiple scattering theory (MST) is introduced to describe the superposition of the external incident acoustic field and the radiative scattered field induced by the array, by which the structure of the array and the performance of acoustic concentrator can be optimized. By the way, the MST can be used to estimate and optimize not only the a...