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Near-field effects on the sound transmission and absorption of elastic micro-perforated plates in impedance tubes
Journal of Sound and Vibration ( IF 4.3 ) Pub Date : 2021-02-03 , DOI: 10.1016/j.jsv.2021.116001
Hyun-Sil Kim , Pyung-Sik Ma , Bong-Ki Kim , Sang-Ryul Kim , Seong-Hyun Lee

In this study, the effects of near-field waves on the sound absorption and insulation performance of elastic micro-perforated plates (MPPs) installed in impedance tubes are studied. The sound absorption coefficient and the sound transmission loss (STL) of MPPs are computed by solving structure-acoustic coupled equations, and the results are compared to those by the finite element method (FEM) to confirm the accuracy of the proposed method. As additional near-field waves are included, the results show convergence. For the low-frequency sound absorption of a circular plate without micro-perforations, the first peak frequency is derived analytically as a function of the cavity depth, radius and surface mass density of the plate. It is shown that as more near-field waves are included, the peak frequency moves toward a lower frequency. It is observed that as the mass density decreases or the radius of the tube increases, the peak shift increases. However, the difference between the two solutions remains constant with an increase in the cavity depth. The effect of the near-field waves on the STL of two identical plates is such that the single peak obtained from the plane wave solution splits when the near-field waves are included. As the cavity depth increases, the near-field waves decrease rapidly except the vicinity of the plates, which in turn results in the narrower split, and eventually splitted peaks reduce to a single peak. When two plates have different thicknesses, no peak splitting occurs. Rather, the peak shifts as additional near-field waves are included, similar to the case of sound absorption.



中文翻译:

近场对阻抗管中弹性微孔板传声和吸收的影响

在这项研究中,研究了近场波对安装在阻抗管中的弹性微孔板(MPP)的吸声和隔音性能的影响。通过求解结构声耦合方程来计算MPP的吸声系数和传声损耗(STL),并将结果与​​有限元方法(FEM)进行比较,以确认该方法的准确性。由于还包括其他近场波,因此结果表明收敛。对于没有微孔的圆形板的低频吸声,第一峰值频率是根据腔体深度,板的半径和表面质量密度解析得出的。结果表明,随着更多近场波的加入,峰值频率向更低的频率移动。可以观察到,随着质量密度的降低或管子半径的增加,峰位移增大。但是,两种解决方案之间的差异随着腔深度的增加而保持恒定。近场波对两个相同板的STL的影响是,当包含近场波时,从平面波解获得的单个峰会分裂。随着腔体深度的增加,除了板附近,近场波迅速减小,这又导致分裂变窄,最终分裂的峰减少为单个峰。当两个板的厚度不同时,不会发生峰分裂。而是,与其他吸声情况类似,随着其他近场波的加入,峰移动。峰移增加。但是,两种解决方案之间的差异随着腔深度的增加而保持恒定。近场波对两个相同板的STL的影响是,当包含近场波时,从平面波解获得的单个峰会分裂。随着腔体深度的增加,除了板附近,近场波迅速减小,这又导致分裂变窄,最终分裂的峰减少为单个峰。当两个板的厚度不同时,不会发生峰分裂。而是,与其他吸声情况类似,随着其他近场波的加入,峰移动。峰移增加。但是,两种解决方案之间的差异随着腔体深度的增加而保持恒定。近场波对两个相同板的STL的影响是,当包含近场波时,从平面波解获得的单个峰会分裂。随着腔体深度的增加,除了板附近,近场波迅速减小,这又导致分裂变窄,最终分裂的峰减少为单个峰。当两个板的厚度不同时,不会发生峰分裂。而是,包括其他近场波时的峰移,类似于吸声的情况。近场波对两个相同板的STL的影响是,当包含近场波时,从平面波解获得的单个峰会分裂。随着腔体深度的增加,除了板附近,近场波迅速减小,这又导致分裂变窄,最终分裂的峰减少为单个峰。当两个板的厚度不同时,不会发生峰分裂。而是,与其他吸声情况类似,随着其他近场波的加入,峰移动。近场波对两个相同板的STL的影响是,当包含近场波时,从平面波解获得的单个峰会分裂。随着腔体深度的增加,除了板附近,近场波迅速减小,这又导致分裂变窄,最终分裂的峰减少为单个峰。当两个板的厚度不同时,不会发生峰分裂。而是,与其他吸声情况类似,随着其他近场波的加入,峰移动。反过来导致更窄的拆分,最终拆分的峰减少为单个峰。当两个板的厚度不同时,不会发生峰分裂。而是,与其他吸声情况类似,随着其他近场波的加入,峰移动。反过来导致更窄的拆分,最终拆分的峰减少为单个峰。当两个板的厚度不同时,不会发生峰分裂。而是,与其他吸声情况类似,随着其他近场波的加入,峰移动。

更新日期:2021-02-11
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