dc.contributor.author | Svensson, U. Peter | |
dc.contributor.author | Martin Roman, Sara-Regina | |
dc.contributor.author | Slechta, Jan | |
dc.contributor.author | Summers, Jason E. | |
dc.contributor.author | Teres, Blake H. | |
dc.contributor.author | Gaumond, Charles F. | |
dc.date.accessioned | 2019-03-28T09:00:00Z | |
dc.date.available | 2019-03-28T09:00:00Z | |
dc.date.created | 2018-12-20T13:51:30Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Euronoise. 2018, 2093-2098. | nb_NO |
dc.identifier.issn | 2226-5147 | |
dc.identifier.uri | http://hdl.handle.net/11250/2592097 | |
dc.description.abstract | Edge-diffraction based modeling, in the form of the Edge Source Integral Equation (ESIE), [J. Acoust. Soc. Am. 133, pp. 3681-3691, 2013], has proven efficient and accurate for radiation problems such as modeling loudspeakers in convex-shaped rigid enclosures. Some singularity issues have been identified for certain source/receiver positions, and the problem as regards receiver positions can be avoided through a recently suggested hybrid technique [Proc. Meet. of Acoustics. 26, 015001, 2016]. The hybrid technique uses the edge-diffraction formulation to find the sound pressure at the surface of the scatterer, and employs the Kirchhoff-Helmholtz Integral Equation to propagate the surface sound pressure to external receiver points. For these techniques mentioned above, computed results are assumed to converge towards a correct result, and one usually has to use the finest mesh that is computable with the available resources. Such a single computation does, however, not directly indicate the accuracy of the result, but by employing computations for several mesh sizes, a Taylor expansion model of the computation error can offer the possibility for a Richardson extrapolation as a convergence acceleration technique. This technique is well-known for some computation techniques but possibly not so widely known. Here, this technique will be demonstrated for some particularly challenging cases of computing far-field backscattering at low frequencies from compact scatterers with the ESIE method, as well as some other challenging geometries. Pronounced cancellation effects between first- and higher-order diffraction components lead to very high accuracy requirements for the computations, and convergence acceleration turns out to be highly effective. [Portions of this material are based upon work supported by the Office of Naval Research under Contract No. N68335- 17-C-0336; the Research Council of Norway, project no. 240278; and the ERCIM Alain Bensoussan Fellowship Programme]. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | European Acoustics Association | nb_NO |
dc.relation.uri | http://www.euronoise2018.eu/docs/papers/350_Euronoise2018.pdf | |
dc.title | Accuracy aspects for diffraction-based computation of scattering | nb_NO |
dc.type | Journal article | nb_NO |
dc.description.version | publishedVersion | nb_NO |
dc.source.pagenumber | 2093-2098 | nb_NO |
dc.source.journal | Euronoise | nb_NO |
dc.identifier.cristin | 1646277 | |
dc.relation.project | Norges forskningsråd: 240278 | nb_NO |
dc.relation.project | Andre: N68335- 17-C-0336 | nb_NO |
dc.description.localcode | This article will not be available due to copyright restrictions (c) 2018 by European Acoustics Association | nb_NO |
cristin.unitcode | 194,63,35,0 | |
cristin.unitname | Institutt for elektroniske systemer | |
cristin.ispublished | true | |
cristin.fulltext | original | |