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Sound absorbing properties of spiral metasurfaces inspired by micro-perforated plates

Theoretical & Applied Mechanics Letters 2023年第3期13卷 209-215页

作者： Han Zhang Pengxiang Hao Huilan Wu Zhenyuan Lin Chengpeng Hao Zhengpan Qi Ning Hu Hebei University of Technology 300401 TianjinChina Key Laboratory of Noise and Vibration Institute of AcousticsChinese Academy of Sciences100190 BeijingChina Underwater vehicle Laboratory Institute of AcousticsChinese Academy of Sciences100190 BeijingChina Changzhou University 213164 ChangzhouChina

As a kind of classical low-frequency sound-absorbing material,the microperforated plate(MPP)has been widely ***,we inspired by the sound absorption mechanism of the MPP,a spiral metasurface(SM)is designed and the analytical solution of acoustic impedance and sound absorption coefficient are *** relationship between the sound absorption properties of the MPP and the SM with their own structures is systematically studied,and the analytical solutions are used to optimise the *** is concluded that the MPP and the SM of the same thickness achieve effective absorption in the frequency range between 390-900 Hz and 1920-4266 Hz,with a total thickness less than 1/6 of the ***,the numerical calculation shows that the MPP and SM can match well with the background medium in the effective *** study provides new insights into the design methods of sound-absorbing materials and is potentially suitable for many acoustic engineering applications.

关键词： microperforated plates Spiral metasurfaces Sound-absorbing properties Equivalent dispersion

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High Temperature Effect on Absorption Coefficient of M-MPPs and Sandwich Structures Coupled with MPPs

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Open Journal of Acoustics 2020年第1期10卷 1-18页

作者： Daliwa Joseph Bainamndi Emmanuel Siryabe Serge Yamigno Doka Guy Edgar Ntamack Groupe de Mé canique des Mat&#233 riaux et Acoustique (GMMA) Universit&#233 de Ngaoundé ré Ngaound&#233 ré Cameroun Safran Helicopter Engines Groupe Evaluation Non Destructive Bordes France

This paper addresses the effect of high temperature on absorption performance of sandwich material coupled with microperforated panels (MPPs) in multiple configurations using a finite element model (FEM) over a frequency range from 10 to 3000 Hz. The structure is backed with a rigid wall which can either be Aluminium or Al-Alloy used in aeronautic or automobile. The wave propagation in porous media is addressed using Johnson Champoux Allard model (JCA). The FEM model developed using COMSOL Multiphysics software makes it possible to predict the acoustic absorption coefficient in multilayer microperforated panels (M-MPPs) and sandwich structure. It is shown that, when structures made by MPPs or sandwich materials are submitted to high temperature, the absorption performance of the structure is strongly modified in terms of amplitude and width of the bandgap. For application in sever environment (noise reduction in engines aircrafts), Temperature is one of the parameters that will most influence the absorption performance of the structure. However, for application in the temperature domain smaller than 50?C (automotive applications for example), the effect of temperature is not significant on absorption performance of the structure.

关键词： Absorption Coefficient Finite Element Model microperforated plates Poroelastic Core Sandwich Structures

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