ISSN:
0332-1649
Source:
Emerald Fulltext Archive Database 1994-2005
Topics:
Electrical Engineering, Measurement and Control Technology
,
Mathematics
Notes:
The slow convergence of the incomplete Cholesky preconditioned conjugate gradient (CG) method, applied to solve the system representing a magnetostatic finite element model, is caused by the presence of a few little eigenvalues in the spectrum of the system matrix. The corresponding eigenvectors reflect large relative differences in permeability. A significant convergence improvement is achieved by supplying vectors that span approximately the partial eigenspace formed by the slowly converging eigenmodes, to a deflated version of the CG algorithm. The numerical experiments show that even roughly determined eigenvectors already bring a significant convergence improvement. The deflating technique is embedded in the simulation procedure for a permanent magnet DC machine.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1108/03321640110359778
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