从理论上提出了一种双包覆层局域共振声子晶体结构，结合有限元对该结构带隙产生的机理、影响因素以及隔声特性进行深入分析。结果表明：带隙上边界频率主要由双包覆层弹性模量大的材料决定；下边界频率主要由基体密度小的材料决定。该声子晶体在低频范围具有良好的隔声特性，为声子晶体的结构设计提供理论指导。
The double cladding layer local resonance mechanism resonators in phononic crystal was proposed .The band gap formation mechanisms , the width of band gap affect factors , and sound insulation quantities with finite element methods were analyzed .These results show that starting frequency depends on higher elastic modulus of the double cladding layer elasticity , cut-off frequency depends on smaller bulk density of elasticity .These results that phononic crystal has a good the light quality , low-frequency , width band gap and the sound insulation of characteristics , provides potential applications prospect the reducing of low-frequency noise in the mechanical equipments and provides theoretical guidance for the design of the structure of the phonon crystal .
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