Publication Date

1994

Document Type

Dissertation/Thesis

First Advisor

Marcellus, Richard L.

Degree Name

M.S. (Master of Science)

Department

Department of Industrial Engineering

LCSH

Production control

Abstract

This study compares the two-sided Shewhart chart using runs tests and the two-sided Cumulative Sum chart using runs tests, on the basis of two performance measures-the expected frequency of false alarms between assignable causes and the expected delay in detection of the assignable cause. The production process is examined using the two types of charts under three specific control policies which are: Policy 1 - An assignable cause is sought if a single observation plots beyond the control limits, or if two successive observations plot within the control limits but beyond the warning limits. Policy 2 - An assignable cause is sought if a single observation plots beyond the control limits, or if two out of three observations plot within the control limits but beyond the warning limits. Policy 3 - An assignable cause is sought if a single observation plots beyond the control limits, or if seven successive observations plot within the control limits on any one side of the mean. This is followed by an investigation of the operating curves for the above mentioned policies. Performance of the charts, using these policies, is compared using their operating curves as well as an economic analysis. The results of performance analysis indicate that the two-sided Shewhart chart employing Policy 2 performs the best in terms of operating curves and is also the most economic to adopt, for the particular set of control chart design parameters.

Comments

Includes bibliographical references (pages [97]-98)

Extent

203 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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