脈沖埋弧焊過程的動態(tài)仿真及實驗驗證.pdf

1、⑧中國近代第一所大學FOUNDEDIN1895天畢滅薯TlANJlNUNIVERSITY碩士學位論文●學科專業(yè)：作者姓名：指導教師：天津大學研究生院2005年1月ABSTRACTABSTRACTPulsedsubmergedarcweldingisoueoftheweldingtechniqueswhichareappliedeffectivelyinproduction，buttheproblemofamultitudeofadjus

2、tableparametershasnotbeenthoroughlysolvedasyetandrestrainsgreatlyitspopularizationandapplicationMoreovertherelationshipamongtheweldingprocessparametersisverycomplicatedVerylargerepeatedexperimentsarerequiredtodetermineth

3、eoptimalweldingparameters，andthiswillcauseagreatconsumptionofmaterial，energyandmanpowerTherefore，itisnecessarytodesignamorepracticalandreasonablesimulationmodelforraisingpredictionaccuracyofweldingprocessparameterstoobta

4、intheoptimumweldingtechnologyproperties。Afterthestudyofthemechanismofpulsedsubmergedarcweldingprocessandbasedonthesimulatingresearchachievementsofotherweldingmethods，dynamicsimulationsareperformedonthesystemsofalternativ

5、ewire—feedpulsedsubmergedarcweldingprocessandthatofconstantandthesystemofennstantwirefeedpulsedargonarcweldingprocesswiththeMATLAB／SIMUL／NKsystemanalysistoolrespectivelythewholesystemsimulatingmodelisdeveloped，whichconsi

6、stsofthemainckcuitsimulationmodel，arcloadsystemsimulationmodelandarcchangingsystemsimulationmodel，andanalyzestheinfluenceofthesimulatingparameters(pulsedfrequency／dutyfactor／peakcurrent(voltage)／basecurrent(voltage))onsi

7、mulatingwaveformwhichproves：theinfluenceofpulsedparametersonthesimulatingwaveformisremarkable，itisfeasiblet0conlrolthearcvoltageandweldingcurrentinsomerangesthroughadjustingthepulsedparametersofsimulatingmodelinpulsedsub

8、mergedarcwelding，andthestabilityofweldingprocess，weldingproductivityandweldingqualityaterelatedtothearcvoltageandweldingcurrenttightlyintheactualweldingproduction，whichprovesthepracticabilityofthedesignedsimulatingmodelG

9、oodagreementisshownbetweenthesimulatedandexperimentalresultsThereforethedesignedsimulationsystemplaysanimportantroleinpredictingweldingprocessparametersandCangreatlyshortentheexperimentperiodandsaveagreatconsumptionofmat