A Control Scheme Integrating the T Chart and TCUSUM Chart

作者：Qu Liang; Wu Zhang^*; Liu Tien I

来源：Quality and Reliability Engineering International, 2011, 27(4): 529-539.

DOI：10.1002/qre.1153

• quality control
• statistical process control
• control chart
• time between events
• CUSUM chart
• steady-state ATS
• average loss

This article proposes an integrated scheme (T&TCUSUM chart) which combines a Shewhart T chart and a TCUSUM chart (a CUSUM-type T chart) to monitor the time interval T between the occurrences of an event or the time between events. The performance studies show that the T&TCUSUM chart can effectively improve the overall performance over the entire T shift range. On average, it is more effective than the T chart by 26.66% and the TCUSUM chart by 14.12%. Moreover, the T&TCUSUM chart performs more consistently than other charts for the detection of either small or large T shifts, because it has the strength of both the T chart (more sensitive to large shifts) and the TCUSUM chart (more sensitive to small shifts). The implementation of the new chart is almost as easy as the operation of a TCUSUM chart.

• 出版日期2011-6
• 单位南阳理工学院