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1、再生型车削颤振的在线综合预报研究证明监测系统可以准确判别切削颤振的发生，减少偶然因素引起的过判和漏判。关键词：切削颤振，方差比，自相关函数，预报函数，在线监测万方数据宁波大学硕士学位论文ResearchonComprehensiveOn-linePredictionofRegenerativeCuttingChatterAbstractCuttingchatterisanintensiveandrelativevibrationbetweenthecuttingtoolandworkpieceinprocess.Itisoneoftheimportantpr
2、oblembecauseitdecreasesthequalityofproductsandtheefficiencyofprocessing,shortenslifeexpectanciesofcuttingtoolsandmachines.So,itisofsignificantimportanceforacceleratingthedevelopmentofmanufacturingtoanalyzeandcontrolcuttingchatter.Firstly,severalmodelsofcuttingchattermechanismwerere
3、searchedandthecuttingchatterresearchachievementofon-linemonitoring,predictionandcontrolwassummarized.Basedontheregenerativechattersystem,dynamicmodelandequationoftheregenerativechattersystemwiththetime-delayfeedbackwasresearched.Thetheoreticalanalysisofitscharacteristicsatportsboth
4、timeandfrequencydomainvariesprovidedfoundationforsimulations.Secondly,basedonthechattingcharacteristicsatportsbothtimeandfrequencydomainvaries,thesignalanalysistheoryofchattingwassimulated.Inthetimedomain,usingthevariancetheory,chattingsignalstability,transitionandflutterstatewasre
5、searched,andthemainfrequencyandautocorrelationfunctionrelationshipwassimulatedusingtheautocorrelationtheory.TheresolutionofautocorrelationandBurgalgorithmandthepowerspectrumestimationchangesresultfromChattersignalfrequencywereresearchedthroughparameterizationpowerspectralestimation
6、.Thirdly,theonlinechattingsignalacquisitionandanalysissystemusingaccelerationsensorsandFFTanalyzerwasformatted,anditonline-monitoredcuttingprocessonC646Shenyangmachineandcollectedcuttingstatedata.Thesigncharacteristicsatportsbothtimeandfrequencydomainwasanalyzedusingchattingsignala
7、nalysistheory.Thecharacteristicquantityreflectingthechattertimedomainandfrequencydomaincharacteristicswasfound,anditsfeasibility,accuracyandtimelinesswasanalyzed,forconstructionofthecuttingchattercomprehensivepredictionfunctiondobasic.Finally,thecuttingchattercomprehensivepredictio
8、nfunctionwasconstructed,us
