On the indirect measurement of airflow resistivity of thin specimens in mid-frequencies via measured transfer matrix (T12).

IF 2.3 2区 物理与天体物理 Q2 ACOUSTICS
S Pandey, D P Jena
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引用次数: 0

Abstract

Recent experiments demonstrated that airflow resistivity (AFR) of fibrous porous materials can be calculated indirectly via impedance and transmission loss tubes in the mid-frequency region [Pandey and Jena (2025). Meas. Sci. Technol. 36, 035901]. In the present work, a method for estimating AFR is devised using the second element, T12, of the four-pole parameters or the transfer matrix (T), of the given porous material, as measured via a transmission loss tube. The theoretical background is discussed first, followed by the finite element simulation [conducted according to ASTM (2019a) E2611-19 standard] on fourteen materials, sourced from literature, with AFR ranging from ∼ 2 to 99 kPa·s/m2. It is observed that these results depend significantly on the sample thickness, and by keeping the thickness in the range of 10-15 mm, the AFR can be estimated in a broadband mid-frequency region with errors of ≤ 2.6%. At last, experiments are conducted on five materials, three (fibrous materials, high AFR) having samples of three different thicknesses and the other two (low AFR) having thicknesses of 10 mm and 15 mm. The results are presented to authenticate the observations made from simulations, followed by the uncertainty analyses to determine the reliability.

通过测量传递矩阵(T12)间接测量薄试件中频气流电阻率。
最近的实验表明,纤维状多孔材料的气流电阻率(AFR)可以通过中频区域的阻抗和传输损耗管间接计算[Pandey和Jena(2025)]。量。科学。科学通报,2016,33(5):951 - 951。在目前的工作中,设计了一种估计AFR的方法,使用通过传输损耗管测量的给定多孔材料的四极参数的第二元素T12或传递矩阵(T)。首先讨论理论背景,然后对文献中14种材料进行有限元模拟[根据ASTM (2019a) E2611-19标准进行],AFR范围为~ 2至99 kPa·s/m2。观察到,这些结果很大程度上取决于样品厚度,并且通过将厚度保持在10-15 mm范围内,可以在宽带中频区域估计AFR,误差≤2.6%。最后,对5种材料进行了实验,其中3种材料(纤维材料,高AFR)有3种不同厚度的样品,另外2种材料(低AFR)有10 mm和15 mm的厚度。给出了结果来验证模拟的观察结果,然后进行了不确定性分析以确定可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.60
自引率
16.70%
发文量
1433
审稿时长
4.7 months
期刊介绍: Since 1929 The Journal of the Acoustical Society of America has been the leading source of theoretical and experimental research results in the broad interdisciplinary study of sound. Subject coverage includes: linear and nonlinear acoustics; aeroacoustics, underwater sound and acoustical oceanography; ultrasonics and quantum acoustics; architectural and structural acoustics and vibration; speech, music and noise; psychology and physiology of hearing; engineering acoustics, transduction; bioacoustics, animal bioacoustics.
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