Alexander Pollok
Institute of System Dynamics and Control, German Aerospace Center (DLR), Germany
Francesco Casella
Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Italy
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http://dx.doi.org/10.3384/ecp15118577Published in: Proceedings of the 11th International Modelica Conference, Versailles, France, September 21-23, 2015
Linköping Electronic Conference Proceedings 118:62, p. 577-583
Published: 2015-09-18
ISBN: 978-91-7685-955-1
ISSN: 1650-3686 (print), 1650-3740 (online)
In conventional aircraft energy systems, Self-regulating pneumatic valves are used to control the pressure and mass flow of the bleed air. The dynamic behavior of these valves is complex and dependant on several physical phenomena. In some cases, limit cycles can occur, deteriorating performance.
This paper presents a complex multiphysical model of Self-regulating pneumatic valves implemented in Modelica.
First, the working-principle is explained and common challenges in control-system design-problems related to these valves are illustrated.
Then, a Modelica-model is presented in detail, taking into account several physical domains.
It is then shown, how limit cycle oscillations occuring in aircraft energy systems can be represented with this model.
Finally, some multi-domain interactive effects are described.
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