Three transdimensional factors for the conversion of 2D acoustic rough surface scattering model results for comparison with 3D scattering

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dc.contributor.advisorWilson, Preston S.
dc.contributor.advisorIsakson, Marcia J.
dc.creatorTran, Bryant Minhen
dc.date.accessioned2014-03-19T17:17:30Zen
dc.date.accessioned2017-05-11T22:48:12Z
dc.date.available2017-05-11T22:48:12Z
dc.date.issued2013-12en
dc.date.submittedDecember 2013en
dc.date.updated2014-03-19T17:17:31Zen
dc.descriptiontexten
dc.description.abstractRough surface scattering is a problem of interest in underwater acoustic remote sensing applications. To model this problem, a fully three-dimensional (3D) finite element model has been developed, but it requires an abundance of time and computational resources. Two-dimensional (2D) models that are much easier to compute are often employed though they don’t natively represent the physical environment. Three quantities have been developed that, when applied, allow 2D rough surface scattering models to be used to predict 3D scattering. The first factor, referred to as the spreading factor, adopted from the work of Sumedh Joshi [1], accounts for geometrical differences between equivalent 2D and 3D model environments. A second factor, referred to as the perturbative factor, is developed through the use of small perturbation theory. This factor is well-suited to account for differences in the scattered field between a 2D model and scattering from an isotropically rough 2D surface in 3D. Lastly, a third composite factor, referred to as the combined factor, of the previous two is developed by taking their minimum. This work deals only with scattering within the plane of the incident wave perpendicular to the scatterer. The applicability of these factors are tested by comparing a 2D scattering model with a fully three-dimensional Monte Carlo finite element method model for a variety of von Karman and Gaussian power spectra. The combined factor shows promise towards a robust method to adequately characterize isotropic 3D rough surfaces using 2D numerical simulations.en
dc.description.departmentMechanical Engineeringen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/2152/23594en
dc.subjectAcousticsen
dc.subjectRough surfaceen
dc.subjectScatteringen
dc.subjectVon Karmanen
dc.subjectGaussianen
dc.subjectFinite elementsen
dc.subjectFinite element methoden
dc.subjectPerturbation theoryen
dc.subject3Den
dc.subject2Den
dc.subjectTransdimensionalen
dc.subjectCOMSOLen
dc.subjectTexSOARen
dc.subjectScattering cross sectionen
dc.subjectScattering strengthen
dc.titleThree transdimensional factors for the conversion of 2D acoustic rough surface scattering model results for comparison with 3D scatteringen
dc.typeThesisen

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