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Conference Contribution

Integration of CasADi and JModelica.org

Joel Andersson, Johan Åkesson, Francesco Casella, Moritz Diehl

Abstract

This paper presents the integration of two open source softwares:
CasADi, which is a framework for efficient
evaluation of expressions and their derivatives, and the
Modelica-based platform JModelica.org. The integration of the tools is
based on an XML format for exchange of DAE models. The JModelica.org
platform supports export of models in this XML format, wheras CasADi
supports import of models expressed in this format. Furthermore, we have carried out comparisons with
ACADO, which is a multiple shooting package for solving optimal control problems.

CasADi, in turn, has been interfaced with ACADO Toolkit, enabling users to
define optimal control problems using Modelica and Optimica
specifications, and use solve using direct multiple shooting. In addition, a collocation algorithm targeted at
solving large-scale DAE constrained dynamic optimization problems has
been implemented. This implementation explores CasADi's Python
and IPOPT interfaces, which offer a convenient, yet highly efficient environment for development
of optimization algorithms. The algorithms are evaluated using industrially relevant benchmark problems.

Links

http://www.control.lth.se/database/publications/article.pike?artkey=and%2B11mod11


In 8th International Modelica Conference 2011, Dresden, Germany , March 2011.

 
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