Reflected sound field over microperforated panel systems

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-03-14 DOI:10.1016/j.apacoust.2025.110628

Raffaele Dragonetti , Elio Di Giulio , Annunziata Bruno , Antonio Scofano , Rosario Aniello Romano

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Abstract

In this paper the reflected sound field over micro-perforated systems (MPPS) is investigated by using experimental, numerical and theoretical approaches. Two types of MPPS configurations are considered: one with an air cavity termination and the other with a honeycomb layer termination. A theoretical model to assess the reflected sound pressure and particles velocity fields by a microperforated panel backed by a honeycomb layer or by a simple air layer, as well as the angle of reflection, is reported. The theoretical method has been validated by means of experimental measurements in free field and numerical finite element simulations. Results highlight significant differences between MPPS in the case of honeycomb layer or when a simple air cavity is considered. Measurements performed in reverberation chamber and standing wave tube for the same micro-perforated panel have been carried out as well, allowing a further validation of the theoretical model. The latter measurements make possible, at the same time, experimentally appreciate the differences of the absorption coefficient values with and without honeycomb layer, in the case of normal, oblique and diffuse sound incidence.

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微孔板系统的反射声场

本文采用实验方法、数值方法和理论方法对微穿孔系统的反射声场进行了研究。考虑了两种类型的MPPS配置：一种是空腔端接，另一种是蜂窝层端接。本文建立了一种计算蜂窝层或空气层微孔板反射声压场和粒子速度场以及反射角的理论模型。理论方法已通过自由场实验测量和数值有限元模拟得到验证。结果突出了蜂窝层和简单空腔情况下MPPS的显著差异。在混响室和驻波管中对相同的微穿孔板进行了测量，从而进一步验证了理论模型。后一种测量方法可以同时从实验上了解在正常、倾斜和漫射声入射情况下，有蜂窝层和没有蜂窝层的吸收系数值的差异。

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

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.