Microperforated Panel and deep subwavelength Archimedean-inspired spiral cavities for multi-tonal and broadband sound absorption
Microperforated Panel and deep subwavelength Archimedean-inspired spiral cavities for multi-tonal and broadband sound absorption
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DOI：
10.1016/j.apacoust.2020.107901
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发表时间：
2021-01-11
影响因子：
3.4
通讯作者：
Meo, Michele
中科院分区：
文献类型：
--
作者：
Boccaccio, Marco;Bucciarelli, Fabrizio;Meo, Michele
近年来，超材料结构和微穿孔板(MPP)吸声材料被提出作为低频吸声材料的有效替代材料。然而，在一些工程应用中，大厚度的吸波材料是不合适的，在低频范围内不能达到所要求的高和宽带吸收。本文提出了一种深亚波并行排列的MPP和阿基米德螺旋(AIS)混合吸声材料，以获得低频率(即400-2000赫兹)的宽带吸声。利用等效电声模型研究了器件的吸收特性，并进行了参数分析，以优化器件在所需频率范围内的几何参数。设计了两个平行排列的MPPS和AIS结构，以实现550-1650 Hz和380-1250 Hz的频率范围内的吸声，总厚度小于1/28波长(24.3 mm)。此外，还考虑了AIS和双层MPP的并行布置，以在更宽的频率范围(即480-2800赫兹)实现吸收。然后制作了样机，并用阻抗管进行测试，通过传递函数法(TFM)求出法向吸收系数。实验结果表明，与分析模型有很好的相关性，在各自的频率范围内，吸声系数都在60%以上。此外，吸收峰出现在结构的共振频率和高次谐波处，测量值在95%以上。所提出的亚波长混合结构所表现出的低频宽带吸收使该器件适合于许多声学工程应用。(C)2020年由爱思唯尔有限公司出版。
In recent years, metamaterial-structures and Microperforated panel (MPP) absorbers have been proposed as a valid alternative to porous materials for sound absorption in the low frequency range. However, high and broadband absorption cannot be achieved in the low frequency range as required in some engineering applications where large thicknesses of the absorbers are unsuitable. In this work, a deep subwavelength hybrid parallel-arranged MPP and Archimedean-inspired spiral (AIS) absorber is proposed to obtain broadband sound absorption at low frequency (i.e. 400-2000 Hz). The absorption properties are investigated using an equivalent electro-acoustic model and a parametric analysis is performed to optimise the geometric parameters of the device for the desired frequency range. Two parallel arranged MPPs and AIS structures were designed to achieve sound absorption in frequency ranges between 550-1650 Hz and 380-1250 Hz, with a total thickness less than 1/28 wavelength (24.3 mm). In addition, a parallel arrangement of an AIS and a double layered MPP were also considered to achieve absorption in a wider frequency range (i.e. 480-2800 Hz). The prototypes were then fabricated and tested with an impedance tube to evaluate the normal absorption coefficient via the Transfer Function method (TFM). Experimental results show a good correlation with the analytical models, with a absorption coefficient above 60% over the respective frequency ranges. Moreover, absorption peaks occur at the resonance frequencies and higher harmonics of the structures, with measured values above 95%. The low frequency broadband absorption shown by the proposed subwavelength hybrid structures makes the device suitable for many acoustic engineering applications. (C) 2020 Published by Elsevier Ltd.