Transmission Analysis of Acoustic Metamaterials with Helmholtz Resonators

Abstract

Noise reduction has long been an active research subject in the field of acoustic engineering A novel acoustic structure consisting of a perforated membrane-ring structure with a Helmholtz resonator was proposed in this thesis The transmission loss (TL) effective mass density velocity field and membrane displacement of the present structure are studied by using a finite element analysis software package COMSOL Multiphysics It is found that the addition of the Helmholtz resonator can produce a wider attenuation range compared to the use of the single membrane-type acoustic metamaterial By altering the dimensions of the Helmholtz resonator the desired attenuation frequency can be achieved

Date of Award	2017 Aug 28
Original language	English
Supervisor	Jung-San Chen (Supervisor)