Institutionen för naturvetenskap och teknik

Research Seminar in Mathematics - Energy Based Mathematical Modeling, Simulation, and Control of Real World Systems

06 december 2023 13:15 Bio in Forumhuset

Please contact Andrii Dmytryshyn if you have any questions regarding this seminar series.

About the speaker

On Wednesday, 6 december, there will be a special seminar by Volker Mehrmann, who will be visiting us the week 4–8 December. Volker Mehrmann is a world-renowned mathematician. He is a recipient of several prestigious prizes, including  W. T. and Idalia Reid Prize, Hans Schneider Prize in Linear Algebra, as well as an Advanced ERC grant. He is also a fellow of the Society for Industrial and Applied Mathematics and American Mathematical Society. Volker was a president of Gesellschaft für Angewandte Mathematik und Mechanik (GAMM) 2011-2013 and European Mathematical Society (EMS) 2019-2022.


Most real world dynamical systems consist of subsystems from different physical domains, modelled by partial-differential equations, ordinary differential equations, and algebraic equations, combined with input and output connections. To deal with such complex system, in recent years the class of dissipative port-Hamiltonian (pH) descriptor systems has emerged as a very successful modeling methodology. The main reasons are that the network based interconnection of pH systems is again pH, Galerkin projection in PDE discretization and model reduction preserve the pH structure and the physical properties are encoded in the geometric properties of the flow as well as the algebraic properties of the equations. Furthermore, dissipative pH system form a very robust representation under structured perturbations and directly indicate Lyapunov functions for stability analysis.

Another advantage of energy based modelling via pH systems is that each separate model of a physical system can be a whole model catalog from which models can be chosen in an adaptive way within simulation and optimization methods.

We discuss the class of constrained pH systems and illustrate how many classical real world mathematical models can be formulated in this class.

We illustrate the results with some real world examples from gas transport and district heating systems and point out emerging mathematical challenges.