Networked control with delay measurement and estimation

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2009
Major/Subject
Mcode
Degree programme
Language
en
Pages
231-244
Series
CONTROL ENGINEERING PRACTICE, Volume 17, issue 2
Abstract
In research on networked control systems (NCS), the performance of the control system is assumed to be affected by network-induced parameters such as delays, jitters, packet losses and link failures. In this paper, two delay compensation methods are studied, adaptive Smith Predictor and robust control, in the framework of Networked Control Systems while considering the protocol specifications. First, a clock synchronization protocol is implemented in each device of the network, thereby providing the possibility of end-to-end delay measurement, and a compensation strategy based on this measurement and the adaptive Smith Predictor is applied. Secondly, the end-to-end upper bound delay estimate is calculated on the basis of the network architecture and the traffic estimation, and then subsequently used in a robust control based compensation strategy. The switched Ethernet network is used as an example of the communication network of the NCS.
Description
Keywords
networked control systems, QoS estimation, delay compensation, real time systems, network calculus, networked control systems, QoS estimation, delay compensation, real time systems, network calculus
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Citation
Vatanski , N , Georges , J-P , Aubrun , C & Jämsä-Jounela , S-L 2009 , ' Networked control with delay measurement and estimation ' , Control Engineering Practice , vol. 17 , no. 2 , pp. 231-244 .