An economic design of CUSCORE control chart for quality characteristics with exponential distribution

제품의 수명특성 관리를 위한 누적점수 관리도의 경제적 설계

  • Kim, Jong-Gurl (Dept. of Industrial Engineering, Natural Science Campus, Sung Kyun Kwan University) ;
  • Jeong, Young-Min (Dept. of Industrial Engineering, Natural Science Campus, Sung Kyun Kwan University)
  • Published : 1993.10.01

Abstract

This paper considers a procedure for the economic design of a cumulative score(CUSCORE) control chart and more sensitive than X-type control chart for small shift to control the mean of a process with a exponentially distributed quality characteristic. An expected loss - cost model as a function of design variables(sample size, sampling interval, scoring limit and decision limit) is derived. Direct search techniques are used to optimize the model subject to ARL in control. Numerical examples and sensitivity analysis of the model are presented. For selected values of situation parameters a comparison study with CUSUM charts is given. CUSCORE control charts compare favourably with CUSUM charts in cost for speedy production process. The proposed control chart can be directly applied for controlling the lifetime characteristics.

Keywords