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时间:2017-11-08
《基于lsnpe算法的化工过程故障检测》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、第65卷第2期化工学报Vol.65No.22014年2月CIESCJournal·February620·基于LSNPE算法的化工过程故障检测宋冰,马玉鑫,方永锋,侍洪波(华东理工大学化工过程先进控制和优化技术教育部重点实验室,上海200237)摘要:复杂化工过程通常具有多个操作模态,而且采集的数据不服从单一的高斯或非高斯分布。针对化工过程的多模态和复杂数据分布问题,将局部标准化(localstandardized,LS)策略应用于邻域保持嵌入(neighborhoodpreservingembedding,NPE)算法,提出
2、了一种新的基于局部标准化邻域保持嵌入(localstandardizedneighborhoodpreservingembedding,LSNPE)算法的故障检测方法。首先,使用LSNPE算法提取高维数据的低维子流形,进行维数约减,同时保持邻域结构不变。其次,通过特征空间中样本的局部离群因子(localoutlierfactor,LOF)构造监控统计量并确定其控制限。相较于监控多模态化工过程的多模型策略,提出的LSNPE方法不需要过程先验知识的支持,只需建立一个全局的监控模型。最后,通过数值仿真及TennesseeEastma
3、n(TE)过程仿真研究验证了本文提出方法的有效性。关键词:局部标准化;邻域保持嵌入算法;局部离群因子;多模态过程系统;监控模型DOI:10.3969/j.issn.0438-1157.2014.02.036中图分类号:TP277文献标志码:A文章编号:0438—1157(2014)02—0620—08FaultdetectionforchemicalprocessbasedonLSNPEmethodSONGBing,MAYuxin,FANGYongfeng,SHIHongbo(KeyLaboratoryofAdvancedCo
4、ntrolandOptimizationforChemicalProcessesofMinistryofEducation,EastChinaUniversityofScienceandTechnology,Shanghai200237,China)Abstract:Complexchemicalprocessesoftenhavemultipleoperatingmodesandthewithin-modeprocessdatadonotfollowGaussianornon-Gaussiandistributions.To
5、handletheproblemofmultipleoperatingmodesandcomplexdatadistribution,anovelfaultdetectionmethod,localstandardizedneighborhoodpreservingembedding(LSNPE)wasproposedbyapplyinglocalstandardization(LS)strategytotheneighborhoodpreservingembedding(NPE)algorithm.Firstly,LSNPE
6、algorithmwasperformedfordimensionalityreductionandthusthemainfeaturesofthecollecteddatawereextracted.Atthesametime,itcouldkeeptheneighborhoodstructureunchanged.Next,amonitoringstatisticswasestablishedusingthelocaloutlierfactor(LOF)ofeachsampleinfeaturespaceanditscon
7、trollimitwasdetermined.Insteadofbuildingmultiplemonitoringmodelsforcomplexchemicalprocesswithdifferentoperatingmodes,theproposedLSNPEmethodbuiltonlyoneglobalmodeltomonitoramulti-modeprocesswithoutthesupportofanypriorprocessknowledge.Finally,thefeasibilityandefficien
8、cyoftheproposedmethodwereillustratedthroughanumericalexampleandtheTennesseeEastmanprocess.Keywords:localstandardized;neighborhoodpreservin
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