Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/35244
Title: Numerical Modeling and Experiments on Sound Propagation Through the Sonic Crystal and Design of Radial Sonic Crystal
Authors: ARPAN GUPTA
Keywords: sonic cystal, periodic structure, webster horn equation, numerical method, acoustics, sound propagation in waveguide
Issue Date: 5-Apr-2012
Source: ARPAN GUPTA (2012-04-05). Numerical Modeling and Experiments on Sound Propagation Through the Sonic Crystal and Design of Radial Sonic Crystal. ScholarBank@NUS Repository.
Abstract: Sonic crystals are man-made structures consisting of sound hard scatterers placed in a periodic arrangement. Such structures have a unique property of selective sound attenuation in a specific range of frequencies which is determined by the geometry of the structure. In this work, different numerical models to model sound propagation through the sonic crystal are presented. Initially, a 1-D model based on the Webster horn equation is developed, which is later improved by the quasi 2-D model. Sound attenuation through the numerical models are compared with the experiments and finite element simulations, and it shows good agreement. Based on the 1-D model, a parametric study is performed to obtain some design guidelines for high sound attenuation. The numerical model developed for the rectangular sonic crystal is extended to the polar coordinates to design a novel structure called as the radial sonic crystal. Instead of scatterers being placed in rectangular periodic arrangement, scatterers are placed in the polar coordinates around a point source. The design of radial sonic crystal is validated experimentally and using the finite element simulation. The result shows a high sound attenuation in the desired range of frequencies, which is due to the periodic design of the radial sonic crystal.
URI: http://scholarbank.nus.edu.sg/handle/10635/35244
Appears in Collections:Ph.D Theses (Open)

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