ACOUSTIC METAMATERIAL WITH AIR-BACKED DIAPHRAGM FOR BROADBAND ABSORPTION: A PRELIMINARY STUDY

被引：0

作者：

Dong, Qian ^{[1
]}

Song, Xiaolei ^{[1
]}

Ray, Subhrodeep ^{[1
]}

Liu, Haijun ^{[1
]}

机构：

[1] Temple Univ, Dept Mech Engn, Philadelphia, PA 19122 USA

来源：

PROCEEDINGS OF THE ASME 2020 INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, IMECE2020, VOL 1 | 2020年

基金：

美国国家科学基金会;

关键词：

acoustic absorption; metamaterial; metasurface; impedance matching; INDEX;

D O I：

暂无

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

Membrane-based acoustic metamaterials have been reported to achieve 100% absorption, the acoustic analogue of photonic black-hole. However, the bandwidth is usually very narrow around some local resonance frequency, which limits its practical use. To address this limitation and achieve a broadband absorption, this paper first establishes a theoretical framework for unit cells of air-backed diaphragms, modeled as an equivalent mass-spring-dashpot system. Based on the impedance match principle, three different approaches are numerically investigated by tuning the cavity length, the static pressure in the cavity, and the effective damping of perforated plates. A prototype with polyimide diaphragm and 3D printed substrate is then fabricated and characterized using an acoustic impedance tube. Preliminary experiments show the feasibility to achieve an absorption bandwidth of similar to 200 Hz at center frequency of 1.45 kHz. This work pays the way for developing a sub-wavelength light weight broadband acoustic absorber for a variety of applications in noise control.

引用

页数：5