由于巴西坚果效应，粒度梯度颗粒材料的吸音效果得到改善

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2024-11-21 DOI:10.1016/j.apacoust.2024.110416

Long Xu , Minglong Wang , Hui Li , Xiaozhen Li , Teng Wu , Chunguang Wang , Zhandong Huang , Peipei Jia , Jun Yang , Xiaobing Cai

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引用次数: 0

摘要

颗粒材料因其普遍存在和丰富独特的特性，正吸引着越来越多的研究人员。然而，与其在其他领域的众多功能相比，颗粒材料在声波领域的应用却较少受到关注。在本文中，我们提出利用颗粒材料中的巴西坚果效应引起的粒度偏析，可以显著改善吸声效果。首先，我们分析了尺寸逐级增大的颗粒的吸声情况。研究发现，声能耗散机制可能与粒度有关。其次，研究了经过振动处理的大小混合颗粒的吸声情况。由于巴西坚果效应引起的尺寸偏析，最初吸声能力有限的尺寸混合颗粒表现出明显的吸声能力，既拓宽了吸声带，又提高了低频吸声率。这项研究表明，对颗粒材料进行简单加工可能是制造优质吸声材料的一种可行方法。

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Improved sound absorption by size gradient granular materials due to Brazil-nut effect

Granular material is attracting increasing research momentum due to its prevalence and rich unique properties. Nevertheless, compared with its numerous functions in other areas, the application of granular material in acoustic waves has received less attention. In this paper, we propose that by exploiting Brazil-nut effect induced particle size segregation in granular material, a significant improvement in the sound absorption can be achieved. Firstly, sound absorptions by particles with step-increasing sizes have been analyzed. It is found that size-dependent mechanisms of sound energy dissipation may occur. Secondly, sound absorptions by size-mixed particles with vibration treatment have been studied. As a result of the Brazil-nut effect induced size segregation, the size-mixed particles with initially limited sound absorptivity exhibited remarkably improved sound absorbing capability, with both broadened absorbing band and raised low-frequency absorption. This work demonstrates that simple processing of the granular material may become a promising way to create premium sound absorbers.

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来源期刊

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

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.