一种变参数的控制图方法及其稳健分析

Research on a kind of control chart with vary- parameter and Its robust analysis

针对在实际应用中,现有的控制图仅仅对某个固定大小的偏移有效的问题,首先提出了一种变参数的控制图设计方法,并对这种控制图的平均运行长度的计算方法进行了探讨。然后讨论了变参数控制图的稳健设计方案,通过与常规控制图和EWMA图进行比较,说明提出的监控方法对过程中出现的不同程度的偏移都是有效的。

Aimed at the limitation that current control charts are effective to only one fixed extend shift, a kind of robust control chart is proposed and the average run length calculating method of this chart is also discussed. Then, an optimal design scheme of the robust control chart is discussed. Comparisons of average run length of the robust control chart with those of different charts show that the method proposed is effective to shifts of different sizes.