Functional Dependability of Distributed Control of Multi-Zone Objects Under Failures Conditions
Author
Dubovoi, Volodymyr
Yukhimchuk, Maria
Kovtun, Viacheslav
Grochla, Krzysztof
Дубовой, В. М.
Юхимчук, М. С.
Ковтун, В. В.
Date
2024Metadata
Show full item recordCollections
- Наукові роботи каф. КСУ [203]
Abstract
The significance of the functional dependability problem of distributed control systems is constantly
increasing due to the spread of inexpensive controllers and sensors and the creation of Internet of Things (IoT) systems. In
the case of distributed control of multi-zone objects with the mutual influence of zones, the problem is complicated by
changes in the operating modes of local control systems (LCS) due to the failures of elements of the systems of neighbouring
zones. This, in turn, leads to a change in their failure rates. In this work, the functional dependability model of the
decentralized distributed control system for multi-zone objects was developed and investigated. The model is obtained in the
form of an inhomogeneous Markov chain of the system states caused by failures of elements of LCS. The probabilities of
transitions between states are described by the Chapman-Kolmogorov equations and additional equations that describe the
relationship between the parameters of neighbouring zones and the corresponding LCS. The impact of Data Transmission
System (DTS) overload, controller failures, sensor failures, and DTS failures on the probability of the zones’ state exceeding
the permissible limits was studied. The functional safety assessment model of decentralized control of multi-zone objects,
proposed in the previous works of the author was used for the theoretical analysis. Verification of the theoretical model is
achieved through simulation, leveraging a library of modules developed by the authors on the Scilab/Xcos platform. The
simulation showed that the "cascade failures" process is probable for multi-zone objects with coordinated control according
to a global criterion and a strong connection between the parameters of the zones, which leads to the rapid loss of functional
dependability.
URI:
https://ir.lib.vntu.edu.ua//handle/123456789/43500