切向流下穿孔板声阻抗模型的比较  

Comparison of acoustic impedance models of perforated panel under grazing flow

作　　者：施天润 俞悟周[1] SHI Tianrun;YU Wuzhou(Institute of Acoustics,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学声学研究所

出　　处：《陕西师范大学学报（自然科学版）》2019年第6期80-85,共6页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金(11874290,11204219);国家科技重大专项(2019ZX06004001-002-002)

摘　　要：在穿孔板声衬的设计过程中,需要选择合适的穿孔声阻抗模型。因为切向流条件下的穿孔声阻抗由不同测试方法得到,导致直接采用声阻抗的实验结果对声阻抗计算模型进行比较较为困难。本文采用穿孔声衬在有流条件下的传声损失,对6种切向流穿孔声阻抗模型及30种声阻和声抗的复合模型进行比较。使用传递单元法得到声衬的四极参数及各模型对应的传声损失计算值。与实验结果进行比较,分析不同模型的频谱特性差异。结果显示:在中低频时,6种声阻抗原模型得到传声损失和实验值吻合良好,但中高频均和实验值有较大的偏差;Lee&Ih的声阻模型和Cummings的声抗模型的复合模型,在不高于0.2 Ma的流速下得到的声衬传声损失和实验结果吻合良好,比其他计算模型更接近实验值。Proper impedance model is important to the design of perforated-panel lining.Several widely-used impedance models under grazing flow in literatures vary considerably.Due to the difference between measurement methods,acoustic impedance measurement results differ much from each other,which cause difficulties in direct comparison of impedance prediction models based on measurement results.The transmission losses(TL)of perforated-panel lining under grazing low at different speeds are adopted to compare 6 selected different impedance models and 30 combined models composed by acoustic resistance part and acoustic reactance part of the 6 models.TL can be obtained from the four-pole parameters calculated by the transfer element method.Results show that at low-medium frequency,sound transmission loss obtained from 6 acoustic impedance model in references agree well with measurement results,while at high frequency there exists remarkable deviation between calculation results and measurements.The combination model of the resistance part of Lee&Ih model and the reactance part of Cummings model matches best with the measured results at the flow speed not higher than 0.2 Ma.

关 键 词：穿孔板 切向流 声阻抗 传声损失 

分 类 号：O422.4[理学—声学]