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《Journal of Applied Acoustics》 2019-06
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Diffusion properties of membrane-type metastructure acoustic diffuser

GUAN Xiwen;GAI Xiaoling;LI Xianhui;XING Tuo;CAI Zenong;WANG Fang;Beijing Key Laboratory of Environment Noise and Vibration, Beijing Municipal Institute of Labor Protection;  
Aiming at the shortcomings of traditional acoustic diffuser structure and inconvenient processing,a film-type acoustic metamaterial diffuser has been proposed. The finite element model of the diffuser is established by finite element software. The effects of film tension, mass size, and back cavity depth on the phase regulation of sound waves were analyzed, and compared with the diffusion properties of traditional Schroder diffusers, the decrease of the absorption of sound energy by the superficial surface acoustic diffusers was observed. The incident acoustic energy is more uniformly propagated in all directions. Compared with the traditional Schroder diffuser, the film superstructure surface acoustic diffuser has better diffusion performance,better structure, smaller volume, lighter weight and more convenient processing.
【Fund】: 国家自然科学基金项目(11604015);; 北京市自然科学基金项目(1172007 1182011);; 北京市劳动保护科学研究所2019年改革与发展经费自立课题
【CateGory Index】: TB383.2;O42
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