材料科学
多孔性
消散
降噪系数
衰减系数
吸收(声学)
复合材料
低频
图层(电子)
多孔介质
工作(物理)
光学
热力学
物理
天文
作者
Clément Lagarrigue,Jean‐Philippe Groby,Vincent Tournat,Olivier Dazel,Olga Umnova
摘要
The aim of this work is to design a layer of porous material with a high value of the absorption coefficient in a wide range of frequencies. It is shown that low frequency performance can be significantly improved by embedding periodically arranged resonant inclusions (slotted cylinders) into the porous matrix. The dissipation of the acoustic energy in a porous material due to viscous and thermal losses inside the pores is enhanced by the low frequency resonances of the inclusions and energy trapping between the inclusion and the rigid backing. A parametric study is performed in order to determine the influence of the geometry and the arrangement of the inclusions embedded in a porous layer on the absorption coefficient. The experiments confirm that low frequency absorption coefficient of a composite material is significantly higher than that of the porous layer without the inclusions.
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