APPLICATION OF FEM/BEM METHOD TO INTERIOR ACOUSTICAL FIELD SHAPING BY HELMHOLTZ RESONATORS

摘要

Finite element and direct boundary element method is used to analyze sound field within cavities. Modification of cavity response due to its coupling to Helmholtz resonators is investigated. Sound field driven by harmonic acoustical excitations in the low frequency range is considered. Influence of bounding surface elasticity on the coupled system response due to sound structure interaction is illustrated. Effectiveness of Helmholtz resonators for cases of coupling to either acoustical modes or structural modes or both is explored. Furthermore, admittance boundary conditions in order to model sound absorptive treatment and structural damping are taken into consideration as well.