Johan Ylikiiskilä
Modelon AB, Lund, Sweden
Johan Åkesson
Departement of Automatic Control, Lund University, Sweden
Claus Führer
Departement of Numerical Analysis, Lund University, Sweden
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http://dx.doi.org/10.3384/ecp1106397Ingår i: Proceedings of the 8th International Modelica Conference; March 20th-22nd; Technical Univeristy; Dresden; Germany
Linköping Electronic Conference Proceedings 63:12, s. 97-104
Publicerad: 2011-06-30
ISBN: 978-91-7393-096-3
ISSN: 1650-3686 (tryckt), 1650-3740 (online)
Initializing a model written in Modelica translates to nding consistent initial values to the underlyinDAE. Adding initial equations and conditions creates a system of non-linear equations that can be solved for the initial con guration. This pap reports an implementation of Newton’s method to solve the non-linear initialization system. This implementation also uses a regularization method to deal with singular Jacobians as well as sparse solvers to exploit the sparsity structure of the Jacobian. The implementation is based on the opensource projects Jmodelica.org and Assimulo; KINSOL from the SUNDIALS suite and SuperLU.
Initialization; Newton’s method; regularization; Jmodelica.org; Assimulo; KINSOL; SuperLU
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