Conference article

Implementation of a Modelica Library for Smooth Spline Approximation

Jörg Ungethüm
German Aerospace Center, Institute of Vehicle Concepts, Germany

Dirk Hülsebusch
German Aerospace Center, Institute of Vehicle Concepts, Germany

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Published in: Proceedings of the 7th International Modelica Conference; Como; Italy; 20-22 September 2009

Linköping Electronic Conference Proceedings 43:78, s. 669-675

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Published: 2009-12-29

ISBN: 978-91-7393-513-5

ISSN: 1650-3686 (print), 1650-3740 (online)


In system modeling; table data interpolation is frequently used for e.g. characteristic maps or as replacement of a complicated system. In many cases; the available data are noisy and of limited accuracy. It turns out; that data approximation is advantageous against data interpolation in these cases. A Modelica library for 1-D and 2-D spline approximation on basis of external functions is presented in this paper.


Interpolation; approximation; polynomial splines; data tables


[1] T. Hirsch und M. Eck; “4-Dimensional Table Interpolation with Modelica;” Proceedings of 6th International Modelica Conference 2008; Bielefeld: 2008.

[2] P. Dierckx; Curve and Surface Fitting with Splines; Mcgraw Hill Book Co; 1995.

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