Design of multi-layered porous fibrous metals for optimal sound absorption in the low frequency range  

作　　者：Wenjiong Chen Shutian Liu Liyong Tong Sheng Li 

机构地区：[1]State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology [2]School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney

出　　处：《Theoretical & Applied Mechanics Letters》2016年第1期42-48,共7页力学快报（英文版）

基　　金：the support of the National Basic Research Program(973 Program)of China(Grant No.2011CB610304);the National Natural Science Foundation of China(Grant Nos.11332004 and 11402046);China Postdoctoral Science Foundation(No.2015M571296);the 111 Project(B14013);the CATIC Industrial Production Projects(Grant No.CXY2013DLLG32)

摘　　要：We present a design method for calculating and optimizing sound absorption coefficient of multi-layered porous fibrous metals （PFM） in the low frequency range. PFM is simplified as an equivalent idealized sheet with all metallic fibers aligned in one direction and distributed in periodic hexagonal patterns. We use a phenomenological model in the literature to investigate the effects of pore geometrical parameters （fiber diameter and gap） on sound absorption performance. The sound absorption coefficient of multi- layered PFMs is calculated using impedance translation theorem, To demonstrate the validity of the present model, we compare the predicted results with the experimental data. With the average sound absorption （low frequency range） as the objective function and the fiber gaps as the design variables, an optimization method for multi-layered fibrous metals is proposed. A new fibrous layout with given porosity of multi-layered fibrous metals is suggested to achieve optimal low frequency sound absorption. The sound absorption coefficient of the optimal multi-layered fibrous metal is higher than the single- layered fibrous metal, and a significant effect of the fibrous material on sound absorption is found due to the surface Dorosity of the multi-layered fibrous.We present a design method for calculating and optimizing sound absorption coefficient of multi-layered porous fibrous metals （PFM） in the low frequency range. PFM is simplified as an equivalent idealized sheet with all metallic fibers aligned in one direction and distributed in periodic hexagonal patterns. We use a phenomenological model in the literature to investigate the effects of pore geometrical parameters （fiber diameter and gap） on sound absorption performance. The sound absorption coefficient of multi- layered PFMs is calculated using impedance translation theorem, To demonstrate the validity of the present model, we compare the predicted results with the experimental data. With the average sound absorption （low frequency range） as the objective function and the fiber gaps as the design variables, an optimization method for multi-layered fibrous metals is proposed. A new fibrous layout with given porosity of multi-layered fibrous metals is suggested to achieve optimal low frequency sound absorption. The sound absorption coefficient of the optimal multi-layered fibrous metal is higher than the single- layered fibrous metal, and a significant effect of the fibrous material on sound absorption is found due to the surface Dorosity of the multi-layered fibrous.

关 键 词：Porous fibrous metal MULTI-LAYER Low frequency Acoustic model Design optimization 

分 类 号：TB34[一般工业技术—材料科学与工程]