Investigating the possibility to solve the Hamilton-Jacobi-Bellman Equation by the Finite Element Method to enable feedback control of nonlinear dynamical systems
Publikationen: Thesis / Studienabschlussarbeiten und Habilitationsschriften › Masterarbeit
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2021.
Publikationen: Thesis / Studienabschlussarbeiten und Habilitationsschriften › Masterarbeit
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TY - THES
T1 - Investigating the possibility to solve the Hamilton-Jacobi-Bellman Equation by the Finite Element Method to enable feedback control of nonlinear dynamical systems
AU - Flachberger, Wolfgang
N1 - no embargo
PY - 2021
Y1 - 2021
N2 - Even though Optimal Control Theory was developed in the 1950s its usage in feedback control systems is restricted to linear dynamical systems. In General PID and LQR controllers are still the state of the art which is due to their simple implementation and reliability. There is, however, a wide range of problems in robotics and mechatronics that exceed the ability of these practices due to nonlinear dynamical behaviour. To make Optimal Control Theory feasible in these fields, its application has to be unified and simplified within a software that can reliably solve these problems. It is possible to formulate the Optimal Control Problem in such a way that a solution to the resulting boundary value problem does not only reveal one optimal trajectory but a feedback control law or strategy, as it is called in Game Theory. The PDE which could provide the strategy is called Hamilton-Jacobi-Bellman Equation and it was the aim of this thesis to find out whether or not it is possible to solve it via the Finite Element Method. The first chapters were used to outline the applications of Optimal Control Theory and to derive the needed mathematical concepts. Next, various ways to prepare a problem formulation for the Finite Element Analysis were presented. One of the major challenges of this thesis was to develop a Finite Element software that can solve PDEs in a space with arbitrary dimension. Finally, a problem formulation was developed that features a convex variational form with a unique solution which promises reliable solvability by numerical methods. The results showed that it is fact possible to generate feedback control laws for nonlinear dynamical systems by the Finite Element Method. The author is convinced that the developed methods will shape the future of fields such as control engineering, robotics, automation and AI.
AB - Even though Optimal Control Theory was developed in the 1950s its usage in feedback control systems is restricted to linear dynamical systems. In General PID and LQR controllers are still the state of the art which is due to their simple implementation and reliability. There is, however, a wide range of problems in robotics and mechatronics that exceed the ability of these practices due to nonlinear dynamical behaviour. To make Optimal Control Theory feasible in these fields, its application has to be unified and simplified within a software that can reliably solve these problems. It is possible to formulate the Optimal Control Problem in such a way that a solution to the resulting boundary value problem does not only reveal one optimal trajectory but a feedback control law or strategy, as it is called in Game Theory. The PDE which could provide the strategy is called Hamilton-Jacobi-Bellman Equation and it was the aim of this thesis to find out whether or not it is possible to solve it via the Finite Element Method. The first chapters were used to outline the applications of Optimal Control Theory and to derive the needed mathematical concepts. Next, various ways to prepare a problem formulation for the Finite Element Analysis were presented. One of the major challenges of this thesis was to develop a Finite Element software that can solve PDEs in a space with arbitrary dimension. Finally, a problem formulation was developed that features a convex variational form with a unique solution which promises reliable solvability by numerical methods. The results showed that it is fact possible to generate feedback control laws for nonlinear dynamical systems by the Finite Element Method. The author is convinced that the developed methods will shape the future of fields such as control engineering, robotics, automation and AI.
KW - Optimale Steuerung
KW - Regelungstechnik
KW - nichtlineare dynamische systeme
KW - Spieltheorie
KW - Optimal Control
KW - Game Theory
KW - Differential Games
KW - Feedback Control
KW - Control Theory
KW - nonlinear dynamical systems
M3 - Master's Thesis
ER -