仿生多孔材料吸声性能  

Analysis of sound-absorbing performance of bionic porous material

作　　者：王永华 张成春[1] 王晶[2] 石磊[1] 张雪鹏[1] 任露泉[1] 

机构地区：[1]吉林大学工程仿生教育部重点实验室,长春130022 [2]吉林大学公共教学中心,长春130022

出　　处：《吉林大学学报（工学版）》2012年第6期1442-1447,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金国际合作与交流项目(50920105504);国家自然科学基金面上项目(31071928);国家自然科学基金联合基金项目(U1134109);高等学校博士学科点专项科研基金项目(20110061120048)

摘　　要：以典型的多孔吸声材料——聚氨酯为基材,基于鸮皮肤和覆羽的多层次组织结构与形态特征设计出梯形棱纹表面、背衬空腔的单元仿生模型及梯形棱纹表面且背衬空腔的二元仿生耦合模型。参考阻抗管中吸声系数的传递函数测量法标准GBT_18696.2-2002,采用有限元法分析了不同结构聚氨酯多孔材料的吸声性能。结果表明:所有仿生模型均具有良好的吸声性能,其中,梯形棱纹表面能有效提高多孔材料中的高频吸声性能,背衬空腔能有效提高多孔材料的低频吸声性能,仿生耦合模型能够有效提高多孔材料整个频段内的吸声性能。Taking the typical porous sound-absorbing material polyurethane as the base material,3 bionic models were designed based on the multi-level organization structure and morphological characteristics of skin and coverts of the asprey,including the uni-bionic models with trapezoidal ribbed surface or backing cavity,and the dual-bionic coupled model with both features.Refering to the national standard GBT-18696.2-2002 for the measure method of sound-absorbing coefficient by transfer function method in the impedance tube,the sound-absorbing performance（SAP） of the porous polyurethane with different structures were analyzed by the finite element method.The results showed that all the bionic models demonstrate good SAP,in particular,the trapezoidal ribbed surface improves effectively the SAP of material in the intermediate and high frequency bands,the backing cavity improves the low frequency SAP,and the bionic coupled model improves SAP in the whole frequency range.

关 键 词：工程仿生学 多孔材料 传递函数法 吸声系数 有限元 耦合仿生 

分 类 号：TB17[生物学—生物工程]