基于声场重建的材料吸声系数测量方法

发布时间：2018-11-24 12:33

【摘要】：针对现有方法对材料吸声系数进行现场测量时存在低频测量误差大的问题,本文提出了一种利用扬声器线阵列对材料吸声系数进行现场测量的新方法。该方法使用基于能量比值约束的最小二乘法在待测材料表面进行平面波声场重建并结合双传声器传递函数法对材料的吸声系数进行测量。数值仿真表明在100～1600 Hz频率范围内,新方法在未加约束时能够对材料的吸声系数进行准确测量。在半消声室中利用新方法测量了三聚氰胺泡沫的吸声系数,分析了能量比值约束值对测量结果的影响,并和阻抗管以及其它两种现场测量方法的测量结果进行了对比。结果表明该方法能够对吸声材料在160～1600 Hz频段内的吸声系数进行准确测量,并且相较于现存的现场测量方法,新方法具有更低的测量频率下限。
[Abstract]:In order to solve the problem of large error in low frequency measurement of material sound absorption coefficient, a new method using loudspeaker line array to measure material sound absorption coefficient in situ is proposed in this paper. The method uses the least square method based on the energy ratio constraint to reconstruct the plane wave sound field on the surface of the material to be tested and the method of dual microphone transfer function is used to measure the sound absorption coefficient of the material. The numerical simulation shows that the new method can accurately measure the sound absorption coefficient of the material in the frequency range of 1 600 Hz. The sound absorption coefficient of melamine foam was measured by a new method in a semi-anechoic chamber. The influence of the energy ratio constraint value on the measurement results was analyzed, and the results were compared with those of impedance tube and two other field measurement methods. The results show that this method can accurately measure the sound absorption coefficient of the absorbent material in the 1600 Hz band, and compared with the existing field measurement method, the new method has a lower frequency limit.
【作者单位】：中国科学院噪声与振动重点实验室(声学研究所);
【基金】：国家自然科学基金项目(11304349,11504405)
【分类号】：TB52

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