Identificação Distribuída de Sistemas de Eventos Discretos com o Objetivo de Detecção de Falhas

Abstract

The main drawback of identification of Discrete Event Systems with aim of fault detection is that if the system is composed of several subsystems with concurrent behavior, it may be necessary to record a huge amount of data to obtain the monolithic model with a view to guaranteeing that a large part of the possible fault-free system behavior has been observed. In these cases, we can use a distributed identification technique, where models for the fault-free behavior of the subsystems are obtained, and then these models are run in parallel for fault detection. In this work, we present a method for identifying concurrent subsystems based only on the observation of the input and output controller signals. A virtual plant, simulated using a 3D simulation software and controlled by a programmable logic controller, is used to illustrate the proposed method and to compare the efficiencies of the fault detection methods using the subsystem models and the monolithic model.