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ID:32136734
大小:2.60 MB
页数:76页
时间:2019-01-31
《基于pca的流程工业故障诊断方法分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西南科技大学硕士研究生学位论文第II页AbstractFaultdiagnosisoftheprocessindustryplaysanimportantroleinensuringthesafetyofindustrialproductionandimprovingproductquality.Thispaperstudiesondatainformationextraction,multi-modeandcomplexdistributedprocessdataoffaultdiagnosisforprocessindustry.Themaincontentsareasfollo
2、ws:(1)FortraditionalPCAmethodonlyconsidersdata’sglobalstructureintheprocessofdatadimensionalityreduction,thispaperappliesamethodcalledlocalandglobalstructurepreservingprojections(LGSPP),whichcanprojectthedatatoalow-dimensionalfeaturespacethathassimilarlocalityneighborhoodstructureandglobalstruc
3、turewithoriginalspace.Afterprojection,statisticsandBayesianclassifierareusedtodetectandidentifyfault.Consideringthedynamicproblemindata,augmentedmatrixcontainingthefirsthobservationsisconstructed.SimulationonTEprocessidentifiesitseffectiveness.(2)Tosolvetheproblemofmulti-modeinindustrialprocess
4、data,thispapermakessomeimprovementsfromtheperspectiveofdatapreprocessing.Localneighborhoodstandardization(LNS)isintroducedtodatapreprocessing,thenthepaperproposesLNS-LGSPP.ThismethodappliesLNStopreprocessdata,soitcannotonlysolvetheinfluenceofdifferentmagnitudesbutalsoremovethemulti-distribution
5、feature.ThentheprocesseddataisappliedtoLGSPPtodetectfaultofmulti-modalprocess.ThevalidityoftheproposedmethodisillustratedthroughnumericalandTEprocess.Keywords:faultdetection;principalcomponentanalysis;localitypreserveprojection;multi-mode;localneighborhoodstandardization万方数据西南科技大学硕士研究生学位论文第III页
6、目录1绪论............................................................11.1课题研究背景及意义........................................11.2故障诊断概念及方法........................................21.2.1故障诊断概念........................................21.2.2故障诊断方法........................................21.3基于多元统计理论的故障诊断研究现
7、状.......................41.4本文主要内容...............................................72基于PCA的故障检测..............................................92.1主元分析基本原理..........................................92.2主元选取方法...........................
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