Examination of Acoustic Absorption Characteristics of Foamed Aluminum
Authors: Fusheng, Han; Zhengang, Zhu; Changson, Liu
Source: Acta Acustica united with Acustica, Volume 84, Number 3, May/June 1998 , pp. 573-576(4)
Publisher: S. Hirzel Verlag
Abstract:It has been investigated that the influence of structural parameters of foamed aluminum (FA) is important for its acoustic absorption characteristics. Unlike other fibrous sound-absorbing materials, the relation of acoustic absorption coefficient of FA to the porosity is uncertain. The effect of pore size is non-monotonous, and higher absorption can be obtained only in moderate pore sizes, which is clearly connected with the flow resistance. Absorption at frequencies lower than 800 Hz can be improved by an air gap layer between the sample and the rigid wall. It is also found that compressive deformation is an effective measure to increase the peak absorption and widen the frequency range of higher absorption.
Document Type: Short Communication
Publication date: May 1, 1998
- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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