加权多模型控制在中厚板层流冷却中的应用

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1、上海交通大学硕士学位论文加权多模型控制在中厚板层流冷却中的应用姓名：董志坤申请学位级别：硕士专业：电工理论与新技术指导教师：王昕20090101上海交通大学工学硕士学位论文THEAPPLICATIONOFWMMCINMEDIUMPLATECOOLINGPROCESSABSTRACTEndcoolingtemperatureofhotmediumplatehasimportanteffecttomicrostructure,foritdecidesmechanicalworkingproperties,physicalpropert

2、yandstructurepropertyofthefinishedproductplate.Sothepreciseoflaminarcontrolcoolingofplateisimportantforitcanheightentheproductquantity,developthehighandadditionallyworthyproduct.Basedonstudyingandsummarizingthecorrelativetheoriesoflaminarcoolingandbasictheoryofheattra

3、nsfer,tosolvetheproblemoflargescaleofuncertaintyonthicknessinthemediumplatecoolingprocess,theMultipleModelWeightingAdaptiveControllerwasdevelopedandapplied.ThecontrolleriscalculatedbytheresultofmultiplepredefinedPIDcontrollersmultiplyingtheirweightnumberstomakepreciou

4、scontrolofmediumplatesinallrangeofthickness.Torealizeoptimalcontrol,anOptimalControllerBasedonWeightingMultipleModelsIdentificationisthendeveloped,whicheliminatescontrolerrorultimately.Buttheabovetwocontrolmethodscan’tgetsatisfiedcontrolspeedandaccuracywhenmediumplate

5、sofunknownII上海交通大学工学硕士学位论文thicknessarebeingprocessedforthefirsttime.Tosolvethisproblem,anOptimalControllerBasedonBPNNWeightingMultipleModelsisdevelopedandapplied.Thesimulationresultshowsthatthethreecontrolmethodscanachievestrongstability,robustandadaptiveabilityinnoto

6、nlythecontrolprocessoffixthicknessmediumplates,butalsothatofunknownthicknessmediumplates,andareallsuperiortotheconventionalcontrollers.Satisfactorycontrolledeffectwithhighdegreeofaccuracyhasbeenattained.KEYWORDS：mediumplate,laminarcooling,weightingmultiplemodelscontro

7、ller,optimalcontrol，BPneuralnetworkIII上海交通大学工学硕士学位论文图目录图1单个圆形喷嘴射流构成示意图...........................................................................................12图2对流换热系数a与表面温度T的关系...............................................................................14图3层流冷却

8、设备.......................................................................................................................15图