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《China Mechanical Engineering》 2014-01
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A Study of Characteristics of Automobile Multilayer Sound Absorption Materials Based on Transfer Matrix

Liu Gangtian;Ji Xiaomin;Xi'an University of Technology;Henan University of Science & Technology;  
This paper analyzed the sound absorption characteristics of automobile sound absorption materials with the transfer matrix.Firstly,the multilayer uniform sound absorption materials were decorated,and the sound pressure and normal particle vibration velocity relationship between two layers of sound materials were obtained.Then the i layer and the i+1layer of sound absorption materials in front of the experimental material steel plate were considered separately,and the acoustic impedance ratio between two layers was obtained.Thus,the sound absorption coefficient calculation formula of multilayer sound absorption materials would be given.Finally,instances calculation and experimental measurements of the sound absorption coefficient among the uniform sound absorption materials of three different thicknesses were carried out,and the correctness of the sound absorption coefficient was verified,which was studied from the transfer matrix characteristic calculation of automobile multilayer sound absorption materials.A theoretical basis for transfer matrix characteristics of the multilayer sound absorption materials will be provided.
【Fund】: 国家自然科学基金资助项目(51075124);; 河南省科技攻关资助项目(11210221051)
【CateGory Index】: TB34
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