Bernd Kolar, Hubert Rams, Markus Schöberl,
"Application of Symmetry Groups to the Observability Analysis of Partial Differential Equations"
: Proceedings of the 23rd International Symposium on Mathematical Theory of Networks and Systems (MTNS), Seite(n) 247-254, 7-2018
Application of Symmetry Groups to the Observability Analysis of Partial Differential Equations
Sprache des Titels:
Proceedings of the 23rd International Symposium on Mathematical Theory of Networks and Systems (MTNS)
Symmetry groups of PDEs allow to transform solutions continuously into other solutions. In this paper, we use this property for the observability analysis of nonlinear PDEs with input and output. Based on a differential-geometric representation of the nonlinear system, we derive conditions for the existence of special symmetry groups that do not change the trajectories of the input and the output. If such a symmetry group exists, every solution can be transformed into other solutions with the same input and output trajectories but different initial conditions, and this property can be used to prove that the system is not observable. We also put emphasis on showing how the approach simplifies for linear systems, and how it is related to the well-known observability concepts from infinite-dimensional linear systems theory.