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Acoustic anechoic layers with singly periodic array of scatterers: Computational methods, absorption mechanisms, and optimal design

Acoustic anechoic layers with singly periodic array of scatterers: Computational methods, absorption mechanisms, and optimal design

作     者:杨海滨 李岳 赵宏刚 温激鸿 温熙森 

作者机构:Vibration and Acoustics Research Group Laboratory of Science and Technology on Integrated Logistics SupportCollege of Mechatronics and Automation National University of Defense Technology 

基  金:Project supported by the National Natural Science Foundation of China(Grant Nos.1100429 and 51275519) 

出 版 物:《Chinese Physics B》 (中国物理B(英文版))

年 卷 期:2014年第23卷第10期

页      码:283-291页

摘      要:The acoustic properties of anechoic layers with a singly periodic array of cylindrical scatterers are investigated. A method combined plane wave expansion and finite element analysis is extended for out-of-plane incidence. The reflection characteristics of the anechoic layers with cavities and locally resonant scatterers are discussed. The backing is a steel plate followed by an air half space. Under this approximate zero transmission backing condition, the reflection reduction is induced by the absorption enhancement. The absorption mechanism is explained by the scattering/absorption cross section of the isolated scatterer. Three types of resonant modes which can induce efficient absorption are revealed. Due to the fact that the frequencies of the resonant modes are related to the size of the scatterers, anechoic layers with scatterers of mixed size can broaden the absorption band. A genetic optimization algorithm is adopted to design the anechoic layer with scatterers of mixed size at a desired frequency band from 2 kHz to l0 kHz for normal incidence, and the influence of the incident angle is also discussed.

主 题 词:acoustic anechoic layer resonant scattering resonant absorption singly periodic mixed size 

学科分类:12[管理学] 083002[083002] 1204[管理学-公共管理类] 120402[120402] 0830[工学-生物工程类] 08[工学] 0837[0837] 

核心收录:

D O I:10.1088/1674-1056/23/10/104304

馆 藏 号:203124300...

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