一.一曼罾鼻皇舞鲁曼皇曼曼鼍曼皇曼曼量曼皇鼍鼍曼曼曼曼曼量皇曼曼曼曼曼曼毫曼量曼量量曼曼曼曼曼舅曼曼鼍量曼曼曼曼曼皇曼量曼鼍曼芭皇曼蔓曼皇曼曼曼一华北电力大学硕十学位论文’
ABSTRACT
Today,electricpowerindustryisdevelopingtowardslnorelarge-scaleunitcapacity
andmorecomplicategrid,leadingtoincreasinglyprominentproblemsoftheshafts
torsionalvibration,whichisbigthreattothesecurityoftheunitsandgrid.Thispaper
givesindetailthecurrentresearchprogressofsafetyanalysisontorsionalvibrationof
turbo-Generetorshaftsatdomesticandinternational,deseribstheproblemsofexisting
theories,andthendoessomefurtherresearchaboutitandalsoputsforward
correspondingsolutions.Themethodofshaftsmodelingisdiscused,advantagesand
disadvantagesofmethodstocalculateshaftinherentcharacteristicsiscomparedand
analysed,andthesuperiorityofverifiedriecati—transfer-matrixmethodisverified,using
thefiniteelementmethod.Thecalculationprinciplesofshaftsresponseisanalyzed,and
theanal如ealalgorithmofshaftsresponseundertwo-phaseshortcircuitisdeduced.
ThoroughlyanalysisisgiventoreversefatigueS-NclLrveanditsinfluencefactors,such
astorsionalmeanstressandhi曲cyclefatigue.Thecorrespondinganalyticalcorrection
formulaisobtainedanditsaccuracyisverifiedbyfiniteelementmethod.Thispaperalso
presentsanimprovedmodelofreal -timerain -flowcounting,whicheliminatesthedefects
oftheoriginalmodelwhicheasilyproducesleakagepointinthesecondstage.
Combiningthemalfunctionresponsecharacteristics,thethresholdofthefatigue
accumulatingdamageisanalyzedspeciallyandstudiedquantitativelyunderdifferent
loadspectrum,whichprovidestheorybasisfortorsionalvibrationmonitoringand
warning.Themethodofcheckingtorsionalintensityofaxisisanalyzed,thecorrelation
ofintensitycheckingandfatiguedamageisdiscussed,andthechangesoftorsional
fatiguelimitisobtainedunderfatiguedamage.Thepaperprobesthesafetystrategy
analysisoftorsionalvibrationathomeandabroad,getsfatiguelifelossrangeofshafts
withstanding锄impactunderallkindsoffaults,andputforwardthemethodof
computingelement’Svalueatrisl【,whichlayafoundationfortorsionalvibrationsafety
analysis.Thesafetyofshaftsisanalyzedbycombining、航tlllow-pressurerotorweal"
faultofonepowerplantandtwo-phaseshort-circuitfaultsoftheotherpowerplant,
whichverifiesthefeasibilityandaccuracyofthecorrespondingtheory.Thestudyofthis
paperwillhaveapositivesignificanceonreal timelifeassessmentandsafetyanalysisof
torsionalvibrationinpowershafts.
PangLe(Thermalpowerengineering)
Directedbyprof.GuYujiong
Keywords:steamturbineunits;torsionalfatigue;t'miteelementmethod;safetyanalysis;rain flow
methodHcounting
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