Fault Diagnosis of Dynamic Systems by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783030177287
Publisher: Springer International Publishing

9.5.3 Petri Nets

Petri nets [26, 30] are another very popular modeling tool for DESs. They are primarily used to model flows of resources. A petri net consists in a collection of places and transitions. A state of the system is defined as the number of tokens in each place: tokens can be interpreted as resources. Each transition links a number of places (the resources consumed by the transition) to a number of places (the resources generated by the transition).

Under some assumptions (for instance, that the number of tokens on a given place is bounded, i.e., the petri nets is safe), it is possible to build a finite state machine (i.e., an automaton) equivalent to the petri net. Petri nets, however, can also very compactly represent concurrent behaviors, where events affect different parts of the system. This property has been exploited for diagnosis [3].

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