Journal
JOURNAL OF QUALITY TECHNOLOGY
Volume 41, Issue 3, Pages 247-258Publisher
AMER SOC QUALITY CONTROL-ASQC
DOI: 10.1080/00224065.2009.11917780
Keywords
Forward Selection; Linear Regression; Multivariate Statistical Process Control; T-2 Chart
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Both process monitoring and fault isolation are important and challenging tasks for quality control and improvement in high-dimensional processes. Under a practical assumption that not all variables would shift simultaneously, this paper proposes a variable-selection-based multivariate statistical process control (SPC) procedure for process monitoring and fault diagnosis. A forward-selection algorithm is first utilized to screen out potential out-of-control variables; a multivariate control chart is then set up to monitor suspicious variables. Therefore, detection of faulty conditions and isolation of faulty variables can be achieved in one step. Both simulation studies and a real example have shown the effectiveness of the proposed procedure.
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