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《Journal of Vibration and Shock》 2007-01
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SOUND ISOLATION OF COMPOSITE STRUCTURE CONSISTING OF MULTI PHONONIC CRYSTALS

Zeng Guangwu,Xiao Wei,Cheng Yuansheng(Department of Naval and Ocean Engineering,School of Traffic Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074)  
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.
【CateGory Index】: O735;O328
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