Structural parameter effect of porous material on sound absorption performance of double-resonance material

2017 Global Conference on Polymer and Composite Materials

材料科学;化学

Fan, C.^1 ; Tian, Y.^1 ; Wang, Z.Q.^2 ; Nie, J.K.^1 ; Wang, G.K.^1 ; Liu, X.S.^1

Global Energy Interconnection Research Institute, Beijing

102211, China^1

State Grid Henan Electric Power Company, Zhengzhou

450018, China^2

关键词: Acoustic characterization;    Double resonance;    Filling materials;    Power substations;    Resonance cavities;    Service environment;    Sound absorption coefficients;    Structural parameter;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/213/1/012028/pdf
DOI  :  10.1088/1757-899X/213/1/012028

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In view of the noise feature and service environment of urban power substations, this paper explores the idea of compound impedance, fills some porous sound-absorption material in the first resonance cavity of the double-resonance sound-absorption material, and designs a new-type of composite acoustic board. We conduct some acoustic characterizations according to the standard test of impedance tube, and research on the influence of assembly order, the thickness and area density of the filling material, and back cavity on material sound-absorption performance. The results show that the new-type of acoustic board consisting of aluminum fibrous material as inner structure, micro-porous board as outer structure, and polyester-filled space between them, has good sound-absorption performance for low frequency and full frequency noise. When the thickness, area density of filling material and thickness of back cavity increase, the sound absorption coefficient curve peak will move toward low frequency.