Band Structure of Phononic Crystal Consist of Hollow Aluminum Cylinders in Different Media; Finite Element Analysis
Date
2019Source Title
IOP Conference Series: Materials Science and Engineering
Print ISSN
1757-8981
Publisher
IOP
Volume
613
Pages
12018
Language
English
Type
Conference PaperItem Usage Stats
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Abstract
In this study, we investigated band structure of a 2D Phononic Crystal (PnC) which
was consist of hollow aluminum cylinders in different media. To validate the finite element
predictions, we made a square lattice PnC which has lattice constant a=14mm, outer radius
r1=5mm and inner radius r2=4mm of cylinders. In our experimental measurement, by using a
signal generator software, we sent 100 Hz-20kHz sine signal for 5 seconds duration from
speaker to the PnC where placed 1m away from. With the help of a microphone, we recorded
the sound in front of the PnC (Pin) and backside the PnC (Pout). Then we were converted our
recording into frequency domain by standard FFT algorithm, we calculated the Transmission
Loss value according to the formula TL = 20*log10 (Pout / Pin) and obtained the experimental
Transmission Loss. After experimental validation, we conducted band structure analysis of
different combination of the 2D PnC by finite element method.