【摘要】 将穿孔板与氯化聚乙烯/七孔涤纶纤维复合材料进行复合,制备了一系列无后部空腔层的多层复合吸声结构。采用SW230驻波管运用传递函数法测试了复合吸声结构的吸声性能,分析了组合层数、组合方式、复合材料厚度以及穿孔板的孔隙率对吸声性能的影响。结果表明:在双层复合结构中,当穿孔板为测试面时,其吸声性能呈现多孔材料的特性;而测试面为复合材料时,吸声结构具有膜空腔共振的特性;当穿孔板层数超过2层时,复合吸声结构能将多孔材料吸声机制和共振吸声机制进行有机结合,拓宽了其吸声频域,是一种具有工程应用潜的吸声结构。更多还原

【Abstract】 A series of composite multilayer sound absorption structures without cavity layer at the back were prepared by compounding the perforated plate and chlorinated polyethylene/seven-hole hollow polyester fiber composite.The sound absorption properties of the composite multilayer structures were tested by transfer function method using SW230 impedance tubes,and the effects of the number of compound layer,compound mode,thickness of composite and porosity of perforated plate on sound absorption properties were analyzed.The results showed that in the case of double structure,sound absorption properties presented the acoustic characteristics of porous materials when measuring face was perforation plate,while sound absorption properties presented acoustic characteristics of film cavity resonance when measuring face was a composite.In the case of a structure with more than two layers of perforated plate,the composite structure can well combine the sound-absorption mechanism and resonance sound-absorption of porous materials,thus widening its sound-absorption frequency range,and hence this sound absorption structure has potential applications in engineering field.更多还原