Abstract
As a key feature of networked control systems (NCSs), the time delays induced by communication medium sharing and data exchange over the system components could largely degrade the NCS performances or may even cause system instability, and thus, it is of critical importance to reduce time delays within NCSs. This paper studies the time-delay reduction problem in distributed NCSs and presents a dual-way data scheduling mechanism for time-delay reductions in delay-bounded NCSs with time-varying delays. We assess the time delays and their influences on the NCSs first with various delay factors being considered and then describe a one-way scheduling mechanism for network-delay reductions in NCSs. Based upon such a method, a dual-way scheduling algorithm is finally proposed for distributed NCSs with different types of transmitted data packets. Experiments are conducted on a remote teaching platform to verify the effectiveness of the proposed dual-way scheduling mechanism. Results demonstrate that, with the stability time-delay bound considered within the scheduling process, the proposed mechanism is effective for NCS time-delay reductions while addressing the stability, control accuracy, and settling time issues efficiently. Such a proposed mechanism could also be implemented together with some other existing control algorithms for time-delay reductions in NCSs. Our work could provide both useful theoretical guidance and application references for stable tracking control of delay-bounded NCSs.
Highlights
With the rapid advancements of networking technologies over the past decades, there is a growing trend in both industrial and commercial communities to integrate computing, communication, and control systems together to formulate a unified platform via network remote control
The control commands from different information sources are transmitted and exchanged over networks, while their feedback control systems, whose control loops are formed via real-time communication channels, are called networked control systems (NCSs) [1]
As the time delays within NCSs could either be constant, or bounded, or random, they make the NCS system design and analysis complicated. erefore, it is of critical importance to reduce the NCS time delays in engineering practice [5, 6]
Summary
With the rapid advancements of networking technologies over the past decades, there is a growing trend in both industrial and commercial communities to integrate computing, communication, and control systems together to formulate a unified platform via network remote control. The permissible system time-delay bounds play a critical role in determining the system stability performances for NCSs. is is because, on the one hand, there usually exists a huge amount of information being exchanged over the networks, and such information would inevitably induce time delays, while on the other hand, such information is typically of different types, and each type of information may have its own transmitting priorities within the NCS. Results obtained from experiments carried out on a practical remote teaching platform show that, with the scheduling operations conducted within the lower and upper NCS delay bounds, the proposed algorithm could help significantly improve the performances of the distributed NCSs while the system stability could be guaranteed in different cases
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
