基于带隙特性含周期孔的声子晶体板设计

Design of the Phononic Crystal Slab Consists of Periodic Holes Based on Band Gap Features

提出一种含有周期孔和周期柱的声子晶体结构,通过与原始的板柱型声子晶体结构比较,周期孔的引入在增加带隙宽度的同时也增强了其减振特性。可根据结构应变能以及提出的有效质量分析其带隙机理。同时,研究了孔半径、柱半径以及柱高度对声子晶体板带隙特性的影响。研究表明柱半径、孔半径以及柱高度的增加都会使得带隙宽度增加,对应减振特性越好。

A novel phononic crystal consists of slab with periodic holes and stubs was designed. The new designed phononic crystal can obtain wider band gaps and better vibration damping characteristics in comparison with the phononic crystal without periodic holes. The controlling of the BG is explained by the strain energy and the introduced effective mass. The effects of the radii of the stubs, the radii of the holes, and the heights of the stubs on the band gap and the vibration damping are further studied. Results indicate that the width of the first band gap can be increased and the corresponding vibration damping characteristics becomes better when the radii of the stubs, the radii of the holes, or the heights of the stubs are increased.