NUMERICAL STUDY OF SOUND ABSORPTION BY PERFORATED PANELS

摘要

Perforated panels are acoustic absorbers typically spaced from a hard surface that attenuaternsound due to viscous friction in their holes. An accurate acoustic model of a perforated panelrnshould include viscothermal effects to account for the losses associated with the narrowrnperforations. In this paper, a numerical finite element model of a perforated panel includingrnthese loss mechanisms was implemented. For this purpose, the linearized Navier-Stokes modelrnincluded in the commercial package COMSOL Multiphysics is used. Simulations allowrnpredicting sound absorption of these types of elements. Results obtained are compared tornwellestablished analytical models.