Presents a method for designing observers of discrete event systems that are modeled with interpr... more Presents a method for designing observers of discrete event systems that are modeled with interpreted Petri nets. Definitions for observability and structural observability are introduced in order to deal with the computation of initial marking and current marking respectively. The structure of observers is proposed, then an architecture of a system-observer is defined. Finally, the feedback input to the observer is computed; it leads the observer initial marking to the current system marking
INTRODUCTION Assembly workcells are robotic systems constituted by several kinds of components of... more INTRODUCTION Assembly workcells are robotic systems constituted by several kinds of components of miscellaneous nature and behaviour, na-mely manipulators, sensors of diverse complexity, conveyors and other peripheral devices. These systems perform several tasks ...
This paper addresses the problem of online identification of discrete event systems (DES). A pass... more This paper addresses the problem of online identification of discrete event systems (DES). A passive method for the progressive building of Petri net (PN) models from DES outputs evolution is presented. After introducing several concepts related with dynamical properties of DES, a learning algorithm that computes ordinary PN models according to the measurement of cyclic output streams is proposed. A procedure based on this algorithm can be on-line executed tracking the DES behavior from its output signals; the successive computed models tend progressively to represent the actual observed behavior.
Presents a method for designing observers of discrete event systems that are modeled with interpr... more Presents a method for designing observers of discrete event systems that are modeled with interpreted Petri nets. Definitions for observability and structural observability are introduced in order to deal with the computation of initial marking and current marking respectively. The structure of observers is proposed, then an architecture of a system-observer is defined. Finally, the feedback input to the observer is computed; it leads the observer initial marking to the current system marking
INTRODUCTION Assembly workcells are robotic systems constituted by several kinds of components of... more INTRODUCTION Assembly workcells are robotic systems constituted by several kinds of components of miscellaneous nature and behaviour, na-mely manipulators, sensors of diverse complexity, conveyors and other peripheral devices. These systems perform several tasks ...
This paper addresses the problem of online identification of discrete event systems (DES). A pass... more This paper addresses the problem of online identification of discrete event systems (DES). A passive method for the progressive building of Petri net (PN) models from DES outputs evolution is presented. After introducing several concepts related with dynamical properties of DES, a learning algorithm that computes ordinary PN models according to the measurement of cyclic output streams is proposed. A procedure based on this algorithm can be on-line executed tracking the DES behavior from its output signals; the successive computed models tend progressively to represent the actual observed behavior.
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Papers by Ernesto Lopez