薄纤维层对穿孔板的声学影响研究

为了提高附着薄纤维层穿孔板的声学预测精度,通过实验及理论分析方法研究薄纤维层对穿孔板的声学影响。采用声学阻抗管系统测试穿孔饰面板及背腔的吸声系数。测试结果显示,薄纤维层对吸声层的吸声性能具有明显的提高作用。以穿孔板声阻抗模型为基础构建附着薄纤维层的穿孔饰面板等效声阻抗模型,以附加修正参数等效薄纤维层的声学影响。依据吸声系数测试结果计算薄纤维层的等效声学修正参数,结果显示薄纤维层造成的附加阻性修正比较显著。

Study on the acoustic effect of thin fiber layer on perforated panel*

The effect of thin fiber layer on the acoustic properties of perforated panel was studied with experimental and theoretical method in present paper. Using acoustic impedance tube system, the absorption coefficients of perforated panel with thin fiber layer were measured. The test results showed that the thin fiber layer can increase the absorption coefficient obviously. The equivalent acoustic impedance model for perforated panel with thin fiber layer was established on the basis of perforation acoustic impedance model. The additional acoustic effect of thin fiber layer is considered by the correction parameters. And, the correction parameters were calculated with the testing results of absorption coefficient. The results showed that the additional resistant coefficient caused by thin fiber layer is significant.