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《Journal of Vibration and Shock》 2018-12
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A study on sound pressure transmission coefficient of elastic wave propagation to acoustic emission sensors

ZHANG Jianchao;YANG Shaopu;HAO Rujiang;GU Xiaohui;School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University;Institute of Transportation Environment and Safety Engineering,Shijiazhuang Tiedao University;  
Based on the transmission rule of elastic wave on the medium surface of the decomposition in solid,this paper aimed at improving the acoustic emission detection accuracy and efficiency. Firstly,three typical acoustic pressure transmission coefficient calculation formulas in the coupling state were derived based on theoretical derivation,then the influence on transmitting coefficient from the parameters was obtained; the experimental research platform on acoustic emission wave transmission was established,then the theory of computation on sound pressure transmitting coefficient were tested respectively under the above typical conditions; finally,based on the established calculation method of sound pressure transmitting coefficient,this paper analyzed the influence on the sound pressure transmitting coefficient from the acoustic impedance and the thickness value as well as the position of the coupling layer material. It was shown that the theoretical calculation and the experimental test results matched very well. The established calculation formulas on the sound pressure transmitting coefficient contribute to the guidance of acoustic emission sensors picking up the elastic waves.
【Fund】: 国家自然科学基金(U1534204)
【CateGory Index】: TB52;TP212
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