Open AccessBand gaps of a fan-like solid-fluid phononic crystal
Author(s) -
Hongfeng Zhai,
Jiawei Xiang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/770/1/012044
Subject(s) - attenuation , finite element method , vibration , acoustics , frequency band , square (algebra) , low frequency , structural engineering , materials science , engineering , optics , physics , geometry , telecommunications , mathematics , bandwidth (computing)
The vibration problem has a serious impact on modern life. The phononic crystal (PHC) is a periodically arranged composite material, which has good vibration attenuation capability because of its band gap (BG) characteristics. Most of available PHCs are limited to solid structures and the application ranges are limited. In this paper, a new fan-like solid-fluid PHC structure is proposed to supress vibration in special environment. Firstly, the unit cell of fan-like PHC is built and the corresponding band structure is further calulauted by finite element method (FEM). The band structures reveal that this fan-like PHC structure has four BGs below 10000 Hz. In order to illustrate the functionality of the fan-like PHC structure for vibration attenuation, the frequency response function (FRF) of a finite fan-like PHC structure is calculated. The FRF shows that there are strong attenuations in the ranges of BGs. Finally by adjusting the side length of the square inclusion, the influence of the filling rate of the scatterer on BGs is studied. This new PHC provides new ideas for the vibration attenuation of builds at the riverside.