多组声子晶体复合结构的隔声性能

运用波动分析法,导出了平面波垂直入射时声子晶体禁带特性的计算方法。探讨了构建声子晶体复合结构用于隔断和屏蔽人体敏感噪声谱的可行性。分析计算了由多层铅/软橡胶声子晶体与多层钢/丁腈橡胶构成的声子晶体复合结构的隔声性能。结果表明,通过参数的合理调制和搭配,这种声子晶体复合结构能够降低起始频率和提高禁带宽度,达到人们所要求的隔声目标和良好的隔声效果。

Sound Isolation of Composite Strueture Consisting of Multi Phononic Crystals

Based on wave propagation analysis,a method for the calculation of forbidden gap is deduced for the normal incident sound in phononic crystals.Then attention is turned to the feasibility of isolating and shielding noise being sensitive to people,in the case of building composite structure consisting of phononic crystals.And the sound isolation of composite structures consisting of multilayer Pb-soft rubber and steel-butadience acrylnitrile rubber(NBR) is presented.The results show that such composite structures can lower the starting frequency and widen the forbidden band gap by the reasonable modulation and collocation of parameters of phononic crystals,and it is also found that such structures can reach the target of sound due to the good effectiveness.