Design and Simulation of Various kinds of Acoustic Scatterers Placed in Different Types of Mediums

Abstract

These days, noise pollution has become one of the most challenging problems because of augmented usage of automobiles and revolutionary growth in industries. Present work endeavors the investigation of acoustic scattering phenomena in general, however, specific to rigid and elastic scatterers. To start with, scattered sound pressure level has been estimated for sound hard cylinder using analytical method whose results are validated against estimated results from numerical method such as finite element analysis. Subsequently, scattered sound pressure level has also been investigated for elastic cylinder whose results are compared with the results of sound hard cylinder having properties of extremely hard wall. Afterwards, scattered sound pressure level has been calculated for cylinder having multiple layers using analytical method. These analytical results are also judged against the numerical results adequately, which has been demonstrated. Subsequently, scattered sound pressure level has been estimated for sound hard spherical scatterer as well as elastic spherical scatterer using analytical method and validated with the results of numerical method. Some miscellaneous scatterers like perforated cylindrical scatterer with a porous core, kite shape scatterer and trefoil shape scatterer have also been analyzed. All the analyses have been compared using a comparison table by considering the most promising comparison parameters like scattered sound pressure level, reflection of sound and absorption of sound to determine themost appropriate scatterer to enhance the performance of sonic crystal. Sonic crystal is a finite -size periodic array composed of scatterers embedded in a homogeneous fluid medium. Sonic crystal acts as an efficient acoustic noise barrier in a certain frequency band.