{"title":"Composite structure with porous material and parallel resonators for broadband sound absorption at low-to-mid frequencies","authors":"","doi":"10.1016/j.apacoust.2024.110193","DOIUrl":null,"url":null,"abstract":"<div><p>Herein, a broadband acoustic metamaterial composed of parallel Helmholtz resonators (PHR) with embedded channels and porous material (PM), is designed for low-to-mid-frequency noise absorption. A theoretical model of acoustic impedance is developed to illustrate the absorption characteristics of PHR–PM. The validity of the present model is confirmed by comparing the experimental results and numerical simulations. The PM may enhance the sound absorption performance of the PHR–PM by satisfying impedance matching conditions, which provides a new strategy for designing resonant systems with tunable sound-absorption characteristics. Both PM and PHR contribute to sound absorption, although their absorption capacities depend on the frequency ranges. The effects of structural and material parameters on sound absorption capacity are also analytically explored. Results indicate that sound absorption in the co-action and PM-dominated regions is mainly affected by material parameters, while that across the entire frequency range is considerably affected by structural parameters. Moreover, the average absorption coefficient of the 13HRs–PM may reach up to 0.6 at the frequency range of 100–1600 Hz, demonstrating its potential in achieving good broadband sound absorption performance and excellent absorption tenability. The proposed novel composite structure offers a new strategy for realizing high sound absorption at low-to-mid frequencies.</p></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4000,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Acoustics","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0003682X2400344X","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ACOUSTICS","Score":null,"Total":0}
引用次数: 0
Abstract
Herein, a broadband acoustic metamaterial composed of parallel Helmholtz resonators (PHR) with embedded channels and porous material (PM), is designed for low-to-mid-frequency noise absorption. A theoretical model of acoustic impedance is developed to illustrate the absorption characteristics of PHR–PM. The validity of the present model is confirmed by comparing the experimental results and numerical simulations. The PM may enhance the sound absorption performance of the PHR–PM by satisfying impedance matching conditions, which provides a new strategy for designing resonant systems with tunable sound-absorption characteristics. Both PM and PHR contribute to sound absorption, although their absorption capacities depend on the frequency ranges. The effects of structural and material parameters on sound absorption capacity are also analytically explored. Results indicate that sound absorption in the co-action and PM-dominated regions is mainly affected by material parameters, while that across the entire frequency range is considerably affected by structural parameters. Moreover, the average absorption coefficient of the 13HRs–PM may reach up to 0.6 at the frequency range of 100–1600 Hz, demonstrating its potential in achieving good broadband sound absorption performance and excellent absorption tenability. The proposed novel composite structure offers a new strategy for realizing high sound absorption at low-to-mid frequencies.
期刊介绍:
Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense.
Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems.
Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.