Language identification of controlled systems: modeling, control, and anomaly detection
João Martins, J.A. Dente, A. J. Pires, R. Vilela Mendes · IEEE Transactions on Systems Man and Cybernetics Part C (Applications and Reviews) · 2001
Formal language techniques have been used in the past to study autonomous dynamical systems. However, for controlled systems, new features are needed to distinguish between information generated by the system and input control. We show how the modeling framework for controlled dynamical systems leads naturally to a formulation in terms of context-dependent grammars. A learning algorithm is proposed for online generation of the grammar productions, this formulation then being used for modeling, control and anomaly detection. Practical applications are described for electromechanical drives. Grammatical interpolation techniques yield accurate results, and the pattern detection capabilities of the language-based formulation makes it a promising technique for the early detection of anomalies or faulty behavior.