Analysis of the most likely regions of stability of an NCS and design of the corresponding event-driven controller

In this paper, some issues related to design and analysis of real networked control systems (NCS) under the focus of the most likely region of stability are addressed. Such a system is cumbersome due to its inherent variable time delays, ranging from microseconds to hours. To show the influence of s...

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Bibliographic Details
Published in:International journal of automation and computing 2018-02, Vol.15 (1), p.39-51
Main Authors: Batista, Ana Paula, Jota, Fábio Gonçalves
Format: Article
Language:English
Subjects:
CAE) and Design
Computer Applications
Computer-Aided Engineering (CAD
Control
Control stability
Control systems design
Engineering
Luminosity
Mechatronics
Monte Carlo simulation
Redesign
Research Article
Robotics
Stability analysis
Time constant
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Summary:In this paper, some issues related to design and analysis of real networked control systems (NCS) under the focus of the most likely region of stability are addressed. Such a system is cumbersome due to its inherent variable time delays, ranging from microseconds to hours. To show the influence of such huge variations in the control performance, a laboratory-scale luminosity system has been setup using the Internet as part of the control loop with dominant time constant in the order of milliseconds. Proportional and integral (PI) control strategies with and without explicit compensation for the time-delay variations were implemented using an event-driven controller. Using the well-known Monte Carlo method and subsequent analyses of time responses, it has been possible to identify the most likely region of stability. Some experimental results show the influence of the statistical parameters of the delays on the determination of the most likely regions of stability of the NCS and how these can be used in assessment and redesign of the control system. The experiments show that much larger delays than one sample period can be supported by real NCSs without becoming unstable.
ISSN:1476-8186
1751-8520
DOI:10.1007/s11633-017-1099-2