1,396 research outputs found
From data and structure to models and controllers
Systems and control theory deals with analyzing dynamical systems and shaping their behavior by means of control. Dynamical systems are widespread, and control theory therefore has numerous applications ranging from the control of aircraft and spacecraft to chemical process control. During the last decades, a series of remarkable new control techniques have been developed. The majority of these techniques rely on mathematical models of the to-be-controlled system. However, the growing complexity of modern engineering systems complicates mathematical modeling. In this thesis, we therefore propose new methods to analyze and control dynamical systems without relying on a given system model. Models are thereby replaced by two other ingredients, namely measured data and system structure. In the first part of the thesis, we consider the problem of data-driven control. This problem involves the development of controllers for a dynamical system, purely on the basis of data. We consider both stabilizing controllers, and controllers that minimize a given cost function. Secondly, we focus on networked systems. A networked system is a collection of interconnected dynamical subsystems. For this type of systems, our aim is to reconstruct the interactions between subsystems on the basis of data. Finally, we consider the problem of assessing controllability of a dynamical system using its structure. We provide conditions under which this is possible for a general class of structured systems
Beyond Persistent Excitation: Online Experiment Design for Data-Driven Modeling and Control
This paper presents a new experiment design method for data-driven modeling
and control. The idea is to select inputs online (using past input/output
data), leading to desirable rank properties of data Hankel matrices. In
comparison to the classical persistency of excitation condition, this online
approach requires less data samples and is even shown to be completely sample
efficient
Cyclic AMP, folic acid and pterin-mediated protein carboxymethylation in cellular slime molds
AbstractIn aggregative cells of Dictyostelium discoideum, extracellular cAMP induces transient methylation of a Mr 46 000 protein. Starvation induces a 10β100-fold increase in the number of cAMP-receptors, but no change in the amount of the methyl accepting protein. In vegetative amoebae, a temporal increase of methylation of the protein is induced by stimulation with folic acid. Aggregative amoebae of Dictyostelium lacteum also contain a Mr 46 000 protein, which is methylated after addition of the attractant monapterin. Therefore, protein carboxymethylation seems to be a general phenomenon during chemotaxis of the cellular slime molds
A Unifying Framework for Strong Structural Controllability
This paper deals with strong structural controllability of linear systems. In
contrast to existing work, the structured systems studied in this paper have a
so-called zero/nonzero/arbitrary structure, which means that some of the
entries are equal to zero, some of the entries are arbitrary but nonzero, and
the remaining entries are arbitrary (zero or nonzero). We formalize this in
terms of pattern matrices whose entries are either fixed zero, arbitrary
nonzero, or arbitrary. We establish necessary and sufficient algebraic
conditions for strong structural controllability in terms of full rank tests of
certain pattern matrices. We also give a necessary and sufficient graph
theoretic condition for the full rank property of a given pattern matrix. This
graph theoretic condition makes use of a new color change rule that is
introduced in this paper. Based on these two results, we then establish a
necessary and sufficient graph theoretic condition for strong structural
controllability. Moreover, we relate our results to those that exists in the
literature, and explain how our results generalize previous work.Comment: 11 pages, 6 Figure
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