›› 2017, Vol. 37 ›› Issue (6): 40-.doi: 10.16708/j.cnki.1000-758X.2017.0062

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Optimal faul tdiagnosis algorithm based on reduced order observer

 TU  Yuan-Yuan, WANG  Da-Yi, LI  Wen-Bo   

  1. 1BeijingInstituteofControlEngineering,Beijing100190,China
    2BeijingInstituteofSpacecraftSystemEngineering,Beijing100094,China
  • Received:2017-02-17 Revised:2017-04-13 Online:2017-12-25 Published:2017-06-29

Abstract: Inordertoreducethecalculationcapacityoffaultdiagnosisalgorithmsandoptimizethealgorithmparameters,anoptimalfaultdiagnosisalgorithmbasedonreducedorderobserverwasproposed.Firstly,areducedorderobserverwasdesignedtoestimatethefaultwithoutcomplexmatrixblockingoperationbydecouplingthestatesofsystemandstatesoffaultbasedontheprincipleoforthogonality.Secondly,theproblemofdeterminingtheobservergainwastranslatedtotheproblemofdesigningoptimalcontrollerforthedualsystemoffaultdiagnosiserrorsystem,basedonwhichtheminimumvarianceestimationoffaultwasimplemented.Thirdly,afaulttolerantcontrollerwasproposedtocompensatethefaultinfluencebyutilizingtheresultofdiagnosis,soastosegregatethesystemwithfaults.Finally,anumericalsimulationwascarriedouttoverifytheeffectivenessoftheproposedmethod.Theresultshowsthatthedesigneddiagnosisalgorithmcanfastconvergetotherealvalueoffaultin7secondsforatwoordersystem.

Key words: reducedorderobserver, optimalgain, principleofduality, faultcompensation