Papers
Release Time: 2025-04-30Hits:
- Date:2025-04-30
- Title of Paper:Ultra-broadband acoustic absorption by a thin high-order microperforated panel metamaterial
- Journal:Composite Structures
- Summary:Aiming at poor efficiency of the traditional materials in low-mid frequency sound absorption and its narrow
bandwidth, we present an ultra-broadband acoustic metamaterial that can achieve near-perfect continuous
absorption within 380 Hz–3600 Hz with a thickness of only 7.2 cm. Its basic cell is constructed by turning the
original neck of a Helmholtz resonator into multiple smaller ones, and the neck panel becomes into a microperforated panel (MPP). By coupling the characteristics of the cavity’s multi-order resonance and the MPP’s
broadband absorption, the cell’s high-order impedances can be tuned to more match that of the air medium. The
cell can therefore obtain multiple excellent high-order absorption peaks besides the original one; meanwhile all
the peaks can become broader resulting from the larger energy leakage rate. On this basis, a subwavelength 12-
cell sample is obtained of which the absorption band is broadened almost 100% by the high-order peaks and has
an average absorption coefficient above 90%. Characterized by the extraordinary absorption performance, thin
thickness, and easy-fabricated structure, this proposed metamaterial has great potential in noise control engineering applications. - Co-author:Chong Rui Liu, Jiu Hui Wu, Zhengrui Yang, Fuyin Ma
- Volume:Vol.246, 2020
- Page Number:112366 (9 Pages)
- Translation or Not:No
- Date of Publication:2020-02-07
