ELEKTROENERGETSKIH OBJEKATA COMPUTATION OF QUASISTATIC ELECTROMAGNETIC FIELDS OF COMPLEX ELECTRIC POWER FACILITIES Bojan
Trkulja, B., Štih, Ž., Proračun kvazistatičkog elektromagnetskog polja..., Energija, god. 57(2008), Br. 5., str. 580-591 Trkulja, B., Štih, Ž., Computation of Quasistatic Electromagnetic Fields ..., Energija, Vol. 57(2008), No. 5, pp. 580-591 PRORAČUN KVAZISTATIČKOG ELEKTROMAGNETSKOG POLJA SLOŽENIH ELEKTROENERGETSKIH OBJEKATA COMPUTATION OF QUASISTATIC ELECTROMAGNETIC FIELDS OF COMPLEX ELECTRIC POWER FACILITIES
Application of bicubic splines in the boundary element method
Abstract In this paper, we proposed the method for improving the accuracy of BEM, which is based on application of bicubic splines for interpolation functions. Application of bicubic splines ensures continuity of class C 1 at the boundaries of element. Such an interpolation results in smooth approximation of the surface sources leading to high accuracy of computation. Set of integral equations is solved by implementation of Galerkin method for determination of unknown coefficients.The accuracy of the proposed approach is illustrated by comparison of the solution of electric field in thin-plate capacitor by BEM using bicubic splines, second-order polynomial, linear and piecewise-constant interpolation.
A three-dimensional B-spline boundary element
The paper deals with the boundary element discretization of three-dimensional structural problems. A model, based on the management of the boundary by macro-elements, the use of a B-spline quadratic description of the boundary variables and a systematic use of analytical integration, is presented. By referring to rectangular piece-wise solids, the results of the analytical integration are given in a general form, utilizable for any order polynomial shape functions. The discretization process has been designed with the aim of obtaining an accurate evaluation of the stress field. Two numerical tests, which can be compared with analytical and refined finite element solutions, have been selected to check the performance of the model.