上海交通大学学报(自然版)

• 数学 • 上一篇    

一种改进的多元指数加权移动平均控制图

唐灵寒1,苗瑞1,杨东2,赵言正1,江志斌1   

  1. (1. 上海交通大学 机械与动力工程学院,上海 200240; 2. 东华大学 工商管理学院,上海 200051)
  • 收稿日期:2009-06-20 修回日期:1900-01-01 出版日期:2010-06-30 发布日期:2010-06-30

An Improved Multivariate EWMA Control Chart

TANG Linghan1,MIAO Rui1,YANG Dong2,ZHAO Yanzheng1,JIANG Zhibin1   

  1. (1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. School of Business and Management, Donghua University, Shanghai 200051, China)
  • Received:2009-06-20 Revised:1900-01-01 Online:2010-06-30 Published:2010-06-30

摘要: 对多元指数加权移动平均(Multivariate Exponentially Weighted Moving Average,MEWMA)控制图的优化方法进行了深入研究.在绘制控制图的第一阶段,利用基于相邻向量差的数据矩阵构建的协方差矩阵S2作为总体协方差矩阵Σ的估计量,建立了一种改进的MEWMA图.在均值向量发生阶跃偏移和单向持续偏移两种不同失控模式下,比较分析了传统的MEWMA图以及改进的MEWMA图的信号概率和平均运行链长.仿真结果表明,在平滑系数r和偏移系数λ较大时,该改进方法显著提高了MEWMA控制图的监控性能.

关键词: 多元指数加权移动平均(MEWMA)控制图, 总体协方差矩阵估计量, 均值向量偏移系数, 平滑系数

Abstract: This paper researched on the optimization of multivarate exponentially weighted moving average(MEWMA) control chart. In the retrospective phase, a new covariance matrix S2 based on successive differences is recommended for estimating the common covariance matrix Σ. An improved MEWMA chart based on estimator S2 was established. When step shifts or ramp shifts in mean value occur, the signal probabilities and ARLs(average run length) of two MEWMA charts are compared. According to the simulation results, the new control chart presents a remarkable optimization with large smoothing factor r and noncentrality parameter λ.

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