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Impedance deduction from broad-band, point-source measurements at grazing incidence

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Abstract:

A new method has been developed which derives surface impedance from measurements of excess attenuation at grazing angles over locally reacting surfaces. The technique uses classical sound propagation theory to fit complex surface impedance to acoustic measurements. Short range excess attenuation measurements have been made over dry sand, glass beads and felt. Two versions of the impedance deduction technique and two non-invasive measurement methods are presented. The results obtained using both procedures are shown to be consistent with each other and with standing wave tube data.

Document Type: Research Article

Publication date: 1997-11-01

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  • 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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