A new method using discriminant analysis and control charts is proposed for monitoring multivariate process operations more reliably.Fisher discriminant analysis (FDA) is used to derive a feature discriminant direct...A new method using discriminant analysis and control charts is proposed for monitoring multivariate process operations more reliably.Fisher discriminant analysis (FDA) is used to derive a feature discriminant direction (FDD) between each normal and fault operations,and each FDD thus decided constructs the feature space of each fault operation.Individuals control charts (XmR charts) are used to monitor multivariate processes using the process data projected onto feature spaces.Upper control limit (UCL) and lower control limit (LCL) on each feature space from normal process operation are calculated for XmR charts,and are used to distinguish fault from normal.A variation trend on an XmR chart reveals the type of relevant fault operation.Applications to Tennessee Eastman simulation processes show that this proposed method can result in better monitoring performance than principal component analysis (PCA)-based methods and can better identify step type faults on XmR charts.展开更多
在过程监控中,使用现代工业系统中的变量进行准确有效的监控诊断仍然是一个具有挑战性的任务.本文以多元指数加权移动平均(MEWMA)策略结合一种有监督分类器(“one plus epsilon”,简称OPE分类器),提出OPE-MEWMA控制图.在考虑不同模型、...在过程监控中,使用现代工业系统中的变量进行准确有效的监控诊断仍然是一个具有挑战性的任务.本文以多元指数加权移动平均(MEWMA)策略结合一种有监督分类器(“one plus epsilon”,简称OPE分类器),提出OPE-MEWMA控制图.在考虑不同模型、偏移模式和偏移大小的情况下,探究了控制图对均值偏移的检测能力,通过比较平均运行长度等多个指标衡量控制图的性能表现.仿真结果表明,所开发的OPE-MEWMA控制图能够快速检测到均值偏移,灵敏度较高.展开更多
统计过程控制(statistic process control,SPC)是一种科学有效的方法,该技术的应用改变了以往靠经验来进行调整生产的模式。以M IM电容为例,首先通过对电容容值数据连续采集,进行定量的数理统计分析,评估该工艺的工艺控制能力。然后绘...统计过程控制(statistic process control,SPC)是一种科学有效的方法,该技术的应用改变了以往靠经验来进行调整生产的模式。以M IM电容为例,首先通过对电容容值数据连续采集,进行定量的数理统计分析,评估该工艺的工艺控制能力。然后绘制控制图,对工艺进行监控。通过分析控制图,最终对工艺过程的能力水平以及是否处于统计受控状态作出定量结论。在工艺过程中当发现统计数据异常时,及时采取纠正措施,使工艺状态始终受控。通过运用SPC技术对数据进行分析,能有效改进工艺,提高产品质量。展开更多
基金Sponsored by the Scientific Research Foundation for Returned Overseas Chinese Scholars of the Ministry of Education of China
文摘A new method using discriminant analysis and control charts is proposed for monitoring multivariate process operations more reliably.Fisher discriminant analysis (FDA) is used to derive a feature discriminant direction (FDD) between each normal and fault operations,and each FDD thus decided constructs the feature space of each fault operation.Individuals control charts (XmR charts) are used to monitor multivariate processes using the process data projected onto feature spaces.Upper control limit (UCL) and lower control limit (LCL) on each feature space from normal process operation are calculated for XmR charts,and are used to distinguish fault from normal.A variation trend on an XmR chart reveals the type of relevant fault operation.Applications to Tennessee Eastman simulation processes show that this proposed method can result in better monitoring performance than principal component analysis (PCA)-based methods and can better identify step type faults on XmR charts.
文摘在过程监控中,使用现代工业系统中的变量进行准确有效的监控诊断仍然是一个具有挑战性的任务.本文以多元指数加权移动平均(MEWMA)策略结合一种有监督分类器(“one plus epsilon”,简称OPE分类器),提出OPE-MEWMA控制图.在考虑不同模型、偏移模式和偏移大小的情况下,探究了控制图对均值偏移的检测能力,通过比较平均运行长度等多个指标衡量控制图的性能表现.仿真结果表明,所开发的OPE-MEWMA控制图能够快速检测到均值偏移,灵敏度较高.
文摘统计过程控制(statistic process control,SPC)是一种科学有效的方法,该技术的应用改变了以往靠经验来进行调整生产的模式。以M IM电容为例,首先通过对电容容值数据连续采集,进行定量的数理统计分析,评估该工艺的工艺控制能力。然后绘制控制图,对工艺进行监控。通过分析控制图,最终对工艺过程的能力水平以及是否处于统计受控状态作出定量结论。在工艺过程中当发现统计数据异常时,及时采取纠正措施,使工艺状态始终受控。通过运用SPC技术对数据进行分析,能有效改进工艺,提高产品质量。