重力式毛細(xì)管粘度儀恒溫水浴溫度控制系統(tǒng)研究.pdf

1、湖南師范大學(xué)碩士學(xué)位論文重力式毛細(xì)管粘度儀恒溫水浴溫度控制系統(tǒng)研究姓名：楊艷華申請學(xué)位級別：碩士專業(yè)：電路與系統(tǒng)指導(dǎo)教師：汪魯才20100501ABSTRACTGravity。capillaryviscometeristheinstrumentfortestingviscosityofliquid，itisappliedinmanyfields，suchaspetroleum，chemicalindustry，chemicalfiber

2、foodandmedicineThermostaticwaterbathiStheonekeypartofgravity—capillaryviscometers，anditstemperaturecontrolistheonekeytechnologyofviscometersUnderthesupportsofChangshaWeiTeTechniqueDevelopmentCompany’SProject(“Intelligent

3、Viscometer’)，somestudiesareperformedTheconceptionofviscosityispresented，therelationshipofviscosityandtemperatureiSexpounded，andtheresearchstatusanddevelopmenttrendoftemperaturecontrolmethodforthermostaticwaterbathofgravi

4、tycapillaryviscometeriSintroducedAccordingtothethermostaticwaterbath’Ssomecharacteristics，suchasnonlinearity，greathysteresis，ancomplexintelligentcontrolmethodisproposedtomeetthetemperatureerrorofthermostaticwaterbathbyna

5、tionalstandardsofviscositytesting(“methodformeasurementandtestoftheviscosityGB／T256—88”)，whichcombinesimprovedBang—Bangcontrol，selforganizingfuzzycontrol，human—simulatedintelligentcontrolandPWMcontrolofDSPWhenthetemperat

6、ureerrorbetweenthedesiredtemperatureandactualtemperatureinthewatertankislarge，theimprovedBang—BangcontrollerisemployedtoreducetherisetimeofcontrollerisusedtOdecreasethesystemtemperature，theselforganizingfuzzyovershootwhe

7、nthetemperatureerrorissmall，thehuman—simulatedintelligentcontrollerisappliedwhenthetemperatureerrorislessthanthesteady—stateerroroffuzzycontrollerAllexperimentalresultsshowthatthethermostaticwaterbathwithcomplexintellige

8、ntcontrolmethodhassmisfiedperformance，itsovershootisslightandsteady—stateerrorislessthan005。C，whichisbetterthantheChineseNationalStandardsforviscositymeasurementAnonlinearerrorcompensationmethodfordigitaltemperaturesenso