Revisiting nonlinear impedance in acoustic liners

IF 4.3 2区 工程技术 Q1 ACOUSTICS
Rémi Roncen
{"title":"Revisiting nonlinear impedance in acoustic liners","authors":"Rémi Roncen","doi":"10.1016/j.jsv.2025.119058","DOIUrl":null,"url":null,"abstract":"<div><div>Acoustic liners are essential for sound dissipation in aeroacoustic applications, but their impedance response often displays significant nonlinearity under varying sound pressure levels. This study investigates the impact of complex source excitations on the nonlinear impedance of aeroacoustic liners. Using both experiments and the Impulse Response Time-Domain Impedance Boundary Condition (IR-TDIBC) model, the paper explores how varying spectral content, including multitone excitations with different phase configurations, influences the impedance characteristics of liners. Experimental results are compared with theoretical predictions, revealing strong alignment and highlighting the significant role of excitation phase and amplitude in shaping the impedance response. It is the time-domain instantaneous particle velocity at the liner interface that proves to be the primary determinant of the nonlinear response, and the sole input required by the IR-TDIBC.</div><div>Additionally, the influence of the shear grazing flow noise on the impedance is examined by superimposing a single-tone excitation on background flow noise at different Mach numbers. Flow-induced noise is found to increase resistance and decrease reactance, as observed in duct experiments, accounting for some of the changes in impedance under shear grazing flow conditions. These findings underscore the importance of considering both complex source excitations and flow-induced noise when modeling the impedance of aeroacoustic liners, with implications for improving the accuracy of impedance predictions in practical aeroacoustic applications.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"608 ","pages":"Article 119058"},"PeriodicalIF":4.3000,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Sound and Vibration","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022460X25001324","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ACOUSTICS","Score":null,"Total":0}
引用次数: 0

Abstract

Acoustic liners are essential for sound dissipation in aeroacoustic applications, but their impedance response often displays significant nonlinearity under varying sound pressure levels. This study investigates the impact of complex source excitations on the nonlinear impedance of aeroacoustic liners. Using both experiments and the Impulse Response Time-Domain Impedance Boundary Condition (IR-TDIBC) model, the paper explores how varying spectral content, including multitone excitations with different phase configurations, influences the impedance characteristics of liners. Experimental results are compared with theoretical predictions, revealing strong alignment and highlighting the significant role of excitation phase and amplitude in shaping the impedance response. It is the time-domain instantaneous particle velocity at the liner interface that proves to be the primary determinant of the nonlinear response, and the sole input required by the IR-TDIBC.
Additionally, the influence of the shear grazing flow noise on the impedance is examined by superimposing a single-tone excitation on background flow noise at different Mach numbers. Flow-induced noise is found to increase resistance and decrease reactance, as observed in duct experiments, accounting for some of the changes in impedance under shear grazing flow conditions. These findings underscore the importance of considering both complex source excitations and flow-induced noise when modeling the impedance of aeroacoustic liners, with implications for improving the accuracy of impedance predictions in practical aeroacoustic applications.

Abstract Image

重新审视声学衬垫中的非线性阻抗
声学衬垫在气动声学应用中具有重要的消声作用,但在不同声压级下,其阻抗响应往往表现出明显的非线性。本文研究了复杂源激励对气声衬垫非线性阻抗的影响。通过实验和脉冲响应时域阻抗边界条件(IR-TDIBC)模型,探讨了不同谱含量(包括不同相位配置的多音激励)对衬垫阻抗特性的影响。实验结果与理论预测进行了比较,揭示了强一致性,并突出了激励相位和振幅在形成阻抗响应中的重要作用。线性界面处的时域瞬时粒子速度被证明是非线性响应的主要决定因素,也是IR-TDIBC所需的唯一输入。此外,通过在不同马赫数的背景流噪声上叠加单音激励,考察了剪切掠流噪声对阻抗的影响。在风管实验中发现,流动引起的噪声增加了阻力,降低了电抗,这解释了剪切掠流条件下阻抗的一些变化。这些发现强调了在建立气动声学衬垫阻抗模型时考虑复杂源激励和流动诱导噪声的重要性,这对于提高实际气动声学应用中阻抗预测的准确性具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Journal of Sound and Vibration
Journal of Sound and Vibration 工程技术-工程:机械
CiteScore
9.10
自引率
10.60%
发文量
551
审稿时长
69 days
期刊介绍: The Journal of Sound and Vibration (JSV) is an independent journal devoted to the prompt publication of original papers, both theoretical and experimental, that provide new information on any aspect of sound or vibration. There is an emphasis on fundamental work that has potential for practical application. JSV was founded and operates on the premise that the subject of sound and vibration requires a journal that publishes papers of a high technical standard across the various subdisciplines, thus facilitating awareness of techniques and discoveries in one area that may be applicable in others.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信