Scheme and application of dual analytic model based fault isolation and estimation

Jun Zhou, Rufei Zhang, Xiaozhou Yu

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Existent problem of observer based fault detection and isolation is analyzed systemically, and a novel scheme for fault diagnosis is originated based on nominal model and unknown input observer (UIO), which is called dual analytic scheme. The scheme designs UIO from the viewpoint of observing faults instead of estimating states, and then uses the state error between nominal model and UIO to modify and substitute the state estimation error of UIO, so as to establish feasible and practical analytic expression for fault isolation and estimation. The scheme was applied to the fault diagnosis of a three-axis stabilized satellite actuators/sensors, and five simulated reaction wheel/gyro composite faults were isolated and estimated correctly, which demonstrates the efficacy of the dual analytic scheme. Also, it can be seen from the design and application of the scheme that the design of the scheme is simple and has no existence limitation, which effectively extends the application range and depth of observer based fault diagnosis.

Original languageEnglish
Pages (from-to)1017-1022
Number of pages6
JournalYi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument
Volume31
Issue number5
StatePublished - May 2010

Keywords

  • Dual analytic scheme
  • Fault isolation and estimation
  • Nominal system
  • Observer
  • Three-axis stabilized satellite

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