A 3-d acoustic infinite element based on an ellipsoidal...

Details A 3-d acoustic infinite element based on an ellipsoidal... A 3-d acoustic infinite element based on an ellipsoidal...

G - Physics

06

F

G06F 17/50 (2006.01) G06T 17/20 (2006.01) G06F 19/00 (2006.01)

Patent

CA 2227968

In an improvement over conventional finite element techniques, an ellipsoidal infinite element is used far the modeling of acoustic fields in exterior, fluid-filled domains surrounding a structure. This ellipsoidal infinite element is based on a multipole expansion that describes, to arbitrary accuracy, any scattered and/or radiate field exterior to an ellipsoid. Significantly, the respective eccentricities of the three elliptical cross sections of the ellipsoid can take values that are arbitrary and mutually independent. The ellipsoidal infinite element is readily incorporated in any structural or acoustic finite element code.

Amélioration des techniques traditionnelles à éléments finis, permettant d'utiliser un élément infini ellipsoïdal pour modéliser des champs acoustiques dans des domaines remplis de fluide entourant l'extérieur d'une structure. L'élément infini ellipsoïdal est basé sur une expansion multipolaire qui décrit, avec une précision arbitraire, tout champ diffusé et(ou) rayonné extérieur à un ellipsoïde. Chose importante, les excentricités respectives des trois sections transversales elliptiques de l'ellipsoïde peuvent prendre des valeurs arbitraires et indépendantes les unes des autres. L'élément infini ellipsoïdal est facile à incorporer dans tout code à éléments finis structuraux ou acoustiques.

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