Analysis and applications of the motion message estimator for network control systems

Chen-Chou Hsieh, Pau-Lo Hsu

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The time-delay effect in network systems is unavoidable because of its limited transmission bandwidth. In real-time network control systems (NCS), all messages are required to be transmitted or received to meet specifications of the deadline. Therefore, the data dropout may thus occur in NCS due to its time delay in a stochastic nature. In this paper, a motion message estimator is proposed to construct a real-time motion NCS to significantly reduce the data-dropout effect. Both simulation and experimental results indicate that a 3rd-order message estimator based on the Taylor expansion can be properly implemented in NCS for industrial motion control systems. Furthermore, since the uncertainties of the NCS estimator are greatly suppressed by applying the message, experimental results indicate that its integration with the feedforward control leads to significantly improved accuracy for the NCS implemented on an industrial computerized numerical control (CNC) machine tool.
Original languageEnglish
Pages (from-to)45-54
Number of pages10
JournalAsian Journal of Control
Volume10
Issue number1
DOIs
StatePublished - Jan 2008

Keywords

  • motion message estimator; data-dropout; NCS; feedforward control

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