Fault detection and compensation for linear systems over networks with random delays and clock asynchronism

Bo Liu; Yuanqing Xia

doi:10.1109/TIE.2010.2103533

Fault detection and compensation for linear systems over networks with random delays and clock asynchronism

Bo Liu^*, Yuanqing Xia

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

This paper proposes a fault detection and compensation scheme based on likelihood ratios (LRs) for networked predictive control systems with random network-induced time delays and clock asynchronism. The compensator is applied to compensate for the network-induced time delays. The measured outputs are sent back to the local node with random delays and the observer updates based on the time schedule of a remote node clock to avoid the deficiency of asynchronism. Two schemes are proposed in this paper to update the LRs of fault. One of them is to set up a buffer in the local node to save the measured outputs out of sequence, and the observer processes the measured outputs one by one in their original sequence. The other scheme is to discard the measured outputs that are out of sequence; thus, the observer has to estimate the state and update the LRs with intermittent observations. The convergence analysis of a generalized LR test with intermittent observations is proposed as well. A numerical simulation is also given to validate the proposed method.

Original language	English
Article number	5680643
Pages (from-to)	4396-4406
Number of pages	11
Journal	IEEE Transactions on Industrial Electronics
Volume	58
Issue number	9
DOIs	https://doi.org/10.1109/TIE.2010.2103533
State	Published - Sep 2011
Externally published	Yes

Bibliographical note

Funding Information:
The authors would like to thank Prof. Z. Deng for her very helpful suggestions which have improved the presentation of this paper. The work of Prof. Z. Deng was supported by the National Natural Science Foundation of China under Grant 60904086.

Funding Information:
Manuscript received March 17, 2010; revised September 2, 2010, November 20, 2010, and December 8, 2010; accepted December 12, 2010. Date of publication January 6, 2011; date of current version August 12, 2011. The work of Y. Xia was supported in part by the National Natural Science Foundation of China under Grant 60974011, by the Program for New Century Excellent Talents in University of the People’s Republic of China under Grant NCET-08-0047, by the Ph.D. Programs Foundation of the Ministry of Education of China under Grant 20091101110023, by the Program for Changjiang Scholars and Innovative Research Team in University, and by the Beijing Municipal Natural Science Foundation under Grant 4102053.

Keywords

Fault compensation
fault detection (FD)
intermittent observations
likelihood ratio (LR)
networked control systems (NCSs)

ASJC Scopus subject areas

Control and Systems Engineering
Electrical and Electronic Engineering

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10.1109/TIE.2010.2103533

Cite this

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title = "Fault detection and compensation for linear systems over networks with random delays and clock asynchronism",

abstract = "This paper proposes a fault detection and compensation scheme based on likelihood ratios (LRs) for networked predictive control systems with random network-induced time delays and clock asynchronism. The compensator is applied to compensate for the network-induced time delays. The measured outputs are sent back to the local node with random delays and the observer updates based on the time schedule of a remote node clock to avoid the deficiency of asynchronism. Two schemes are proposed in this paper to update the LRs of fault. One of them is to set up a buffer in the local node to save the measured outputs out of sequence, and the observer processes the measured outputs one by one in their original sequence. The other scheme is to discard the measured outputs that are out of sequence; thus, the observer has to estimate the state and update the LRs with intermittent observations. The convergence analysis of a generalized LR test with intermittent observations is proposed as well. A numerical simulation is also given to validate the proposed method.",

keywords = "Fault compensation, fault detection (FD), intermittent observations, likelihood ratio (LR), networked control systems (NCSs)",

author = "Bo Liu and Yuanqing Xia",

note = "Funding Information: The authors would like to thank Prof. Z. Deng for her very helpful suggestions which have improved the presentation of this paper. The work of Prof. Z. Deng was supported by the National Natural Science Foundation of China under Grant 60904086. Funding Information: Manuscript received March 17, 2010; revised September 2, 2010, November 20, 2010, and December 8, 2010; accepted December 12, 2010. Date of publication January 6, 2011; date of current version August 12, 2011. The work of Y. Xia was supported in part by the National Natural Science Foundation of China under Grant 60974011, by the Program for New Century Excellent Talents in University of the People{\textquoteright}s Republic of China under Grant NCET-08-0047, by the Ph.D. Programs Foundation of the Ministry of Education of China under Grant 20091101110023, by the Program for Changjiang Scholars and Innovative Research Team in University, and by the Beijing Municipal Natural Science Foundation under Grant 4102053.",

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N2 - This paper proposes a fault detection and compensation scheme based on likelihood ratios (LRs) for networked predictive control systems with random network-induced time delays and clock asynchronism. The compensator is applied to compensate for the network-induced time delays. The measured outputs are sent back to the local node with random delays and the observer updates based on the time schedule of a remote node clock to avoid the deficiency of asynchronism. Two schemes are proposed in this paper to update the LRs of fault. One of them is to set up a buffer in the local node to save the measured outputs out of sequence, and the observer processes the measured outputs one by one in their original sequence. The other scheme is to discard the measured outputs that are out of sequence; thus, the observer has to estimate the state and update the LRs with intermittent observations. The convergence analysis of a generalized LR test with intermittent observations is proposed as well. A numerical simulation is also given to validate the proposed method.

AB - This paper proposes a fault detection and compensation scheme based on likelihood ratios (LRs) for networked predictive control systems with random network-induced time delays and clock asynchronism. The compensator is applied to compensate for the network-induced time delays. The measured outputs are sent back to the local node with random delays and the observer updates based on the time schedule of a remote node clock to avoid the deficiency of asynchronism. Two schemes are proposed in this paper to update the LRs of fault. One of them is to set up a buffer in the local node to save the measured outputs out of sequence, and the observer processes the measured outputs one by one in their original sequence. The other scheme is to discard the measured outputs that are out of sequence; thus, the observer has to estimate the state and update the LRs with intermittent observations. The convergence analysis of a generalized LR test with intermittent observations is proposed as well. A numerical simulation is also given to validate the proposed method.

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Fault detection and compensation for linear systems over networks with random delays and clock asynchronism

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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