多孔薄片晶体对声音的超常吸收。

Extraordinary absorption of sound in porous lamella-crystals.

机构信息

1] Institute of Technology and Innovation, University of Southern Denmark, DK-5230 Odense, Denmark [2] Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.

1] Instituto de Investigación para la Gestión Integrada de zonas Costeras, Universitat Politècnica de València, Paranimf 1, 46730, Gandia, Spain [2] LUNAM Université, Université du Maine, CNRS, LAUM UMR 6613, Av. O. Messiaen, 72085 Le Mans, France.

出版信息

Sci Rep. 2014 Apr 14;4:4674. doi: 10.1038/srep04674.

DOI:10.1038/srep04674

PMID:24728322

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3985082/

Abstract

We present the design of a structured material supporting complete absorption of sound with a broadband response and functional for any direction of incident radiation. The structure which is fabricated out of porous lamellas is arranged into a low-density crystal and backed by a reflecting support. Experimental measurements show that strong all-angle sound absorption with almost zero reflectance takes place for a frequency range exceeding two octaves. We demonstrate that lowering the crystal filling fraction increases the wave interaction time and is responsible for the enhancement of intrinsic material dissipation, making the system more absorptive with less material.

摘要

我们提出了一种结构材料的设计，该材料具有宽带响应，可完全吸收声音，适用于任何方向的入射辐射。该结构由多孔薄片制成，排列成低密度晶体，并由反射支撑物支撑。实验测量表明，对于超过两个八度的频率范围，会发生强全向吸声，几乎为零的反射率。我们证明，降低晶体填充分数会增加波相互作用时间，并负责增强固有材料耗散，从而使系统在使用较少材料的情况下更具吸收性。