Economic design of a CEV x̄ control chart for determining optimal right-censored times

ABSTRACT

Lifetime is a crucial quality characteristic of electronic products that must be monitored using control charts. Lifetime may provide right-censored data. A conditional expected value (CEV) x̄ control chart was developed to monitor type I right-censored data. Researchers had always assumed that the censored time is a known constant when designing control charts. This study provides an economic design model for optimizing CEV x̄ charts and type I right-censored time for reducing costs associated with quality control and life tests. This method was employed on a practical case of a liquid crystal display module. A sensitivity analysis was also conducted on the influence of the model parameters on the design and censored time of the CEV x̄ chart.

KEYWORDS:

• Conditional expected value
• type I right-censored data
• reliability life test
• $\bar{\mathrm{x}}$ control chart
• economic design

Disclosure statement

No potential conflict of interest was reported by the author.

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

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Pei-Hsi Lee

Pei-Hsi Lee received his PhD degree in Institute of Industrial Engineering and Management from National Yunlin University of Science & Technology, Taiwan. He is an associate professor of the School of Internet Economics and Business at the Fujian University of Technology, Fuzhou city, China. Before joining Fujian University of Technology, Dr Lee served as a manager in the smart factory development department of a rubber company in Taiwan, for 7 years and was an assistant professor at Chung Yuan Christian University in Taiwan, for 2 years. His fields of interest are smart quality control system, reliability engineering, and smart production management.