Extraordinary Acoustic Transmission Properties of Two-dimensional Helmholtz Resonator Array

• Main Authors: Qi-Teng Zhuang, 莊麒騰
• Other Authors: Fu-Li Hsiao
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/80560834571260600039

碩士 === 國立彰化師範大學 === 光電科技研究所 === 103 === In this paper, we combine both 2-D phononic crystal slab and Helmholtz Resonator to create a new type of resonator. Analyzing by finite element method, we find out more physical properties in our designed structure than the common structure. Including the frequency of extraordinary acoustic transmission decreased about 300 kHz, and the transmission intensity and frequency remained unchanged when the influence of incidence angle reduced. Besides, the transmission dip is associated with anti-resonance of steel plate. By stacking the designed structure to increase the thick of the plate led to increase the transmission peaks, which phenomenon can be predicted by spring mass model. The result can be used to enhance the sensor and filter application. Key words: phononic crystal; extraordinary acoustic transmission; Wood's anomaly; spring mass model; bandstructure; finite element method