## Optimal Trajectory Tracking of Nonlinear Dynamical SystemsBy establishing an alternative foundation of control theory, this thesis represents a significant advance in the theory of control systems, of interest to a broad range of scientists and engineers. While common control strategies for dynamical systems center on the system state as the object to be controlled, the approach developed here focuses on the state trajectory. The concept of precisely realizable trajectories identifies those trajectories that can be accurately achieved by applying appropriate control signals. The resulting simple expressions for the control signal lend themselves to immediate application in science and technology. The approach permits the generalization of many well-known results from the control theory of linear systems, e.g. the Kalman rank condition to nonlinear systems. The relationship between controllability, optimal control and trajectory tracking are clarified. Furthermore, the existence of linear structures underlying nonlinear optimal control is revealed, enabling the derivation of exact analytical solutions to an entire class of nonlinear optimal trajectory tracking problems. The clear and self-contained presentation focuses on a general and mathematically rigorous analysis of controlled dynamical systems. The concepts developed are visualized with the help of particular dynamical systems motivated by physics and chemistry. |

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### Contents

1 | |

2 Exactly Realizable Trajectories | 17 |

3 Optimal Control | 79 |

4 Analytical Approximations for Optimal Trajectory Tracking | 119 |

5 Control of ReactionDiffusion Systems | 195 |

Appendix Appendix | 221 |

Curriculum Vitae
| 237 |

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### Common terms and phrases

activator-controlled FHN model affine control system blue solid boundary layers Cayley–Hamilton theorem co-state components composite solution condition Eq constraint equation control signal u(t controllability matrix controlled state equation controlled state trajectory cosh coupling matrix defined depend derivative desired trajectory xd differential equations Dirac delta function dynamical system exact solution exactly realizable trajectories Example feedback control feedback linearization given by Eq inhibitor initial and terminal initial conditions inner equations ISBN leading order linearizable linearizing assumption Löber LTI system matching conditions necessary optimality conditions numerical open loop control optimal control problems optimal trajectory tracking outer equations outer solutions perturbation expansion projectors Qs xo reaction-diffusion systems red dashed line regularization parameter Sect singular perturbation sinh solved Springer terminal conditions traveling wave TU Berlin vector velocity xd r,t XL TL XR TR yend Yi Tl yields yinit