Acoustic anechoic layers with singly periodic arrayof scatterers： Computational methods, absorptionmechanisms, and optimal design

doi:10.1088/1674-1056/23/10/104304

›› 2014, Vol. 23 ›› Issue (10): 104304-104304.doi: 10.1088/1674-1056/23/10/104304

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Acoustic anechoic layers with singly periodic arrayof scatterers： Computational methods, absorptionmechanisms, and optimal design

杨海滨, 李岳, 赵宏刚, 温激鸿, 温熙森

Vibration and Acoustics Research Group, Laboratory of Science and Technology on Integrated Logistics Support, College of Mechatronics and Automation, National University of Defense Technology, Changsha 410073, China

收稿日期:2013-12-30 修回日期:2014-03-07 出版日期:2014-10-15 发布日期:2014-10-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 1100429 and 51275519).

Acoustic anechoic layers with singly periodic arrayof scatterers： Computational methods, absorptionmechanisms, and optimal design

Yang Hai-Bin (杨海滨), Li Yue (李岳), Zhao Hong-Gang (赵宏刚), Wen Ji-Hong (温激鸿), Wen Xi-Sen (温熙森)

Vibration and Acoustics Research Group, Laboratory of Science and Technology on Integrated Logistics Support, College of Mechatronics and Automation, National University of Defense Technology, Changsha 410073, China

Received:2013-12-30 Revised:2014-03-07 Online:2014-10-15 Published:2014-10-15
Contact: Wen Xi-Sen E-mail:wenxs@vip.sina.com
About author:43.20.+g; 43.30.Ky
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 1100429 and 51275519).

摘要/Abstract

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 10 kHz for normal incidence, and the influence of the incident angle is also discussed.

关键词: acoustic anechoic layer, resonant scattering, resonant absorption, singly periodic, mixed size

Abstract: 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 10 kHz for normal incidence, and the influence of the incident angle is also discussed.

Key words: acoustic anechoic layer, resonant scattering, resonant absorption, singly periodic, mixed size

中图分类号: (General linear acoustics)

43.20.+g

43.30.Ky (Structures and materials for absorbing sound in water; propagation in fluid-filled permeable material)

杨海滨, 李岳, 赵宏刚, 温激鸿, 温熙森. Acoustic anechoic layers with singly periodic arrayof scatterers： Computational methods, absorptionmechanisms, and optimal design[J]. , 2014, 23(10): 104304-104304.

Yang Hai-Bin (杨海滨), Li Yue (李岳), Zhao Hong-Gang (赵宏刚), Wen Ji-Hong (温激鸿), Wen Xi-Sen (温熙森). Acoustic anechoic layers with singly periodic arrayof scatterers： Computational methods, absorptionmechanisms, and optimal design[J]. Chin. Phys. B, 2014, 23(10): 104304-104304.

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Acoustic anechoic layers with singly periodic arrayof scatterers： Computational methods, absorptionmechanisms, and optimal design

Acoustic anechoic layers with singly periodic arrayof scatterers： Computational methods, absorptionmechanisms, and optimal design

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