微穿孔板-聚氨酯微孔薄膜复合结构吸声特性  

Sound Absorption Characteristics of Micro-perforated Panel and Polyurethane Micro-porous Membrane Composed Structures

作　　者：陈亮 沈敏 何为 余联庆 王真 CHEN Liang;SHEN Min;HE Wei;YU Lianqing;WANG Zhen(School of Mechanical Engineering and Automation,Wuhan Textile University,Wuhan 430200,China;Hubei Key Laboratory of Digital Textile Equipment,Wuhan 430200,China)

机构地区：[1]武汉纺织大学机械工程与自动化学院,武汉430200 [2]湖北省数字化纺织装备重点实验室,武汉430200

出　　处：《噪声与振动控制》2022年第3期36-41,共6页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(51505344,11872048);湖北省自然科学基金资助项目(2014CFB766);湖北省数字化纺织装备重点实验室开放课题资助项目(DTL2020001)。

摘　　要：当微穿孔板背后空腔的长度受到结构限制,对于低频噪声很难吸收,在微穿孔板后增加一层聚氨酯微孔可渗透薄膜形成复合结构可增加低频吸声特性。设计一种改进的聚氨酯微孔可渗透薄膜流阻测量实验装置,充分考虑材料本身质量的影响,建立微穿孔板-可渗透薄膜复合结构声阻抗电声等效电路,该方法可普遍用于预测此类复合结构吸声特性。理论计算不同可渗透膜材料的面密度、流阻等参数对复合结构垂直入射吸声系数的影响。结果表明:在微穿孔板背后增加一层聚氨酯微孔可渗透薄膜,可以在中低频段获得较好的吸声效果。It is difficult for micro-perforated panel(MPP)to absorb the low-frequency noise when the length of the air cavity behind the MPP is limited by the structure.The MPP backed with a polyurethane micro-porous permeable membrane(PM)can form a composite structure,which have higher sound absorption ability in low-frequency range.In this paper,an improved experimental device for measuring the flow resistance of polyurethane microporous permeable membrane is designed.Considering the influence of material mass,an acoustic impedance electro-acoustic equivalent circuit of MPP-PM composite structure is established,which can be generally applied to the prediction of sound absorption characteristics of such composite structures.The effects of the surface density and flow resistance of different PM materials on the normal incidence sound absorption coefficient of the composite structure are calculated theoretically.The results show that adding a layer of polyurethane micro-porous PM behind the MPP can obtain good sound absorption effect in the middle and low frequency band.

关 键 词：声学 微穿孔板 可渗透薄膜 声电类比法 无规入射 低频吸声 

分 类 号：O429[理学—声学]