Determination of Acoustical Energy Dissipation/Production Potentiality from the Acoustical Transfer Functions of a Multiport
The acoustic energy conservation law in presence of flow can be very effectively expressed with the help of two variables: the acoustic mass velocity and the acoustic exergy. The minimal and maximal ratio of the dissipated or generated acoustic power over the incident acoustic power are computed from the scattering matrix of an acoustic element. This method is applied to a diaphragm and to a laminar element in presence of flow. It is shown that the results provide indication for the physics of dissipation of acoustic energy in these sytems.
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Document Type: Research Article
Publication date: 1999-11-01
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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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