復(fù)合材料液-固擠壓過程辨識與控制.pdf

1、西北工業(yè)大學(xué)碩士學(xué)位論文復(fù)合材料液固擠壓過程辨識與控制姓名：甘才軍申請學(xué)位級別：碩士專業(yè)：機械電子工程指導(dǎo)教師：齊樂華20040301西北工業(yè)大學(xué)碩卜學(xué)位論文IdentificationandControloftheProcessforCompositeFormingbyLiquidSolidExtrusionAbstractLiquidsolidextrusionofcompositematerialisanewkindofmetal

2、formingprocesswhichhasbeendevelopedinrecentyearswithapromisingpracticalapplicationprospectforitssimpleworkingprocedurelowcostandgoodworkpieceperformance.ThroughalotofexperimentsTheoptimizationandchosingmethodofkeyprocess

3、parameters(pouringtemperaturemoldwarmuptemperatureimpregnatingpressureimpregnatingtime)hasbeenmastered.Underthepreconditionofappropriatechosingtheseparameterstheefectivecontrolofextrusionvelocityisthekeyofmadinggoodworkp

4、iece.Butthecontrolofextrusionvelocityremainsahandworkanditisheavilyaffectedbysuchuncertaintiesasahandlersknowledgeandskillabouttheprocess.Inordertosolvetheproblemtheautomaticcontroloftheextrusionvelocityisstudiedandacomp

5、utercontrolsystemisalsodesignedunderexistingcondition.Thecontrolofextrusionvelocityintheprocessisnotonlyinvolvedintheprocessequipmentbutalsorelatedtotheprocessitself.Sointhepaperproceedingfromtheautomaticcontrolofextrusi

6、onvelocityandbasedonthebasiccontrolstrategypresentedfirstlytherelationamongparametersoftheprocesssuchaspressuretemperatureanddisplacementisinvestigatedandthemodeloftheprocesshasbeenbuiltusingsystemidentificationmethod.Th

7、enacorrespondingcontrollerisdesignedtogetherwithitscontrolalgorithmandthecontrolsystemisprovedviableandefectivebytheresultsofsimulationonthecontrolsystem.Intheendtheproblemoftherealizationofthecontrolsystemisdiscussedbyu

8、singmodularizationmethod.Thehardwareofthecontrolsystemisdesignedandasofewarewithaperfectmarnnachineinterfaceisdevelopedtoo.Thustheproblemofthecontrolofextrusionvelocityduringtheprocesshasbeenbasicallysolvedwhichestablish