Time-between-events charts for on-line process monitoring
Liu, J.Y.
Xie, M.
Goh, T.N.
Ranjan, P.
Dept. of Industrial & Syst. Eng., National Univ. of Singapore, Singapore;
This paper appears in: Engineering Management Conference, 2004. Proceedings. 2004 IEEE International
Publication Date: 18-21 Oct. 2004
Volume: 3,
On page(s): 1061- 1065 Vol.3
ISBN: 0-7803-8519-5
INSPEC Accession Number: 8331246
Digital Object Identifier: 10.1109/IEMC.2004.1408854
Current Version Published: 2005-04-04
Abstract
With the development of automation and high-quality manufacturing techniques, on-line process monitoring system has become essential for enterprises to ensure product quality and reduce cost. This paper presents an on-line process monitoring system, which provides the users with different charting methods to monitor time-between-events data, and detect process shifts. Some advanced time-between-events control charts, such as cumulative quantity control (CQC) chart, CQC-r chart, exponential EWMA and exponential CUSUM chart are discussed. Comparisons of their performance are carried out based on average time to signal (ATS). The design of an on-line SPC system is described, followed by an application example. The approaches presented in this paper complement other on-line systems and can be integrated into existing systems easily.
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