Study on Absorption Characterestics of Micro-perforated Panel Array based on Electro-acoustic Theory
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摘要: 针对声学有限元算法计算微孔板阵列吸声系数计算复杂、难以实现这一问题，提出了利用声电类比法计算具有不同吸声带宽的微孔板结构并联构成的微孔板阵列的吸声系数，利用该方法对声波垂直入射、按一定角度斜入射和从各个角度漫入射时的吸声系数进行理论计算，并利用阻抗管法进行垂直入射时吸声系数测试实验。结果表明，通过调节微穿孔板阵列的不同单元的深度，可以使其吸声系数在3个倍频程范围内达到0.6以上，得到较为理想的吸声结构，理论与实验结果吻合较好。Abstract: Acoustic finite element method for calculating the absorption coefficient of micro-perforated panel array is complex and hard to achieve. The normal incidence absorption coefficient, oblique incidence absorption coefficient and random incidence absorption coefficient are calculated using electro-acoustic equivalent circuit model. Measurement of the normal incidence coefficients are carried out to validate the Electro-acoustic equivalent circuit model. Experimental results show that the absorption coefficients can be up to 0.6 in the range of three octaves by adjusting the depth of diffident units in micro-perforated array and theoretical and experimental results are in good agreement.
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