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A Comparative Study of Two Variants of the Equivalent Sources Method in Scattering Problems

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In order to compare the stability and accuracy of two particular variants of the Equivalent Sources Method – one using the "least square minimization" technique (LSM) and the other being Ochmann's "full-field equations" method (FFE)–, numerical experiments on a three-dimensional scattering problem have been performed. Results obtained with monopole sets show that, in spite of exhibiting much less stability than FFE and being more affected by the source configuration employed, LSM can provide, under particular conditions, better solutions. It is also shown that, with an expansion in spherical wave functions, FFE and LSM solutions have comparable precision for higher frequencies. At low frequencies the two methods differ, LSM being more precise. Examination of the amplitude and phase of the sources provided by the two methods is used in order to explain their differences in performance. It has been verified that an indicator, based on the LSM source strengths for a given source configuration, can give information concerning which of the two methods is likely to produce a better solution in that case.
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Document Type: Research Article

Publication date: September 1, 2005

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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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