The use of the singular value decomposition method in the synthesis of the Neumann's boundary problem

• Jan Sikora ^[1] ; Jerzy Skoczylas ^[1] ; Jan Sroka ^[1] ; Stanislaw Wincenciak ^[1]
  1. [1] Institute of the Theory of Electrical Engineering and Electrical Measurements, Technical University of Warsaw, Polonia
• Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 4, Nº 1, 1985, págs. 19-27
• Idioma: inglés
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• Resumen

  • This paper discusses an electrostatic, homogeneous field in a uniform two‐dimensional domain with Neumann's boundary conditions. The boundary conditions are known only at some segments of the boundary. The synthesis is understood as the computation of the remaining boundary conditions which would ensure the required potential distribution in some subdomains within the boundary. The introduction of a single‐layer potential leads to Fredholm's equation of the second order. Stepwise approximation of the source distribution along the boundary rearranges Fredholm's equation and the requirements concerning the single layer potential distribution. It leads to a matrix equation with a rectangular coefficient matrix. In order to solve approximately this equation, in the sense of the least squares minimization, the singular value decomposition (SVD) method is used. The choice of subdomains with determined potential distribution influences significantly the conditioning of the equation. Easy selection of an acceptable solution among all possible solutions proves the suitability of the SVD method in the above problem. The numerical experiments reported in the paper are a good illustration of this.