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大型汽轮发电机组轴系扭振安全性分析(2)

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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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