Development and evaluation of the control charts for variables

In quality control (QC), control chart is one of the most effective tools to monitor the process and ensure the product quality. It is a powerful Statistical Process Control (SPC) method to make quick response when quality problems occur in order to avoid serious economic loss. The first objective o...

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Main Author: Ou, Yanjing.
Other Authors: School of Mechanical and Aerospace Engineering
Format: Theses and Dissertations
Language:English
Published: 2013
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Online Access:http://hdl.handle.net/10356/51178
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-511782023-03-11T17:31:08Z Development and evaluation of the control charts for variables Ou, Yanjing. School of Mechanical and Aerospace Engineering Chen Songlin Wu Zhang DRNTU::Engineering::Industrial engineering::Quality engineering In quality control (QC), control chart is one of the most effective tools to monitor the process and ensure the product quality. It is a powerful Statistical Process Control (SPC) method to make quick response when quality problems occur in order to avoid serious economic loss. The first objective of this PhD project is to develop new SPC techniques, for which several highly effective control charts for variables have been proposed and carefully investigated. The second task is to provide a systematic performance comparison among all typical control charts for variables including the Shewhart chart, Cumulative Sum (CUSUM) chart and Sequential Probability Ratio Test (SPRT) chart. These studies are conducted in two phases. The first phase presents the development of the control charts for monitoring process mean. The Syn- , optimal SPRT and VSI (Variable Sampling Interval) SPRT charts have been developed in Chapter 3. A systematic study has also been conducted to compare the effectiveness and robustness of nine typical control charts for monitoring the mean of variables in Chapter 4. The nine charts are categorized into three types (the type, CUSUM type and SPRT type) and three versions (the basic version, optimal version and fully-adaptive (FA) version). A design table has been made to facilitate the users to select a chart by taking into considerations of both performance and simplicity of the charts, as well as the probability distribution of the mean shift δµ of the process. The second phase presents the development of the control charts for monitoring both process mean and variance. The VSSI (Variable Sample Size and Sampling Interval) CUSUM and ABS (Absolute) SPRT charts have been developed in Chapter 5. This phase also studies the overall performance of nine typical control charts for monitoring process mean and variance in a quantitative and analytical manner in Chapter 6. A general model for the optimal designs of the control charts is adopted throughout this thesis. In this model, Average Extra Quadratic Loss (AEQL) is used as the objective function, in-control Average Time to Signal (ATS0) and inspection rate (R) are the constraints. It is expected that the development of the new charts and the systematic comparative studies carried out in this thesis will make useful contribution to the literature and practice of quality engineering. Doctor of Philosophy (MAE) 2013-02-26T07:44:12Z 2013-02-26T07:44:12Z 2013 2013 Thesis http://hdl.handle.net/10356/51178 en 205 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Industrial engineering::Quality engineering
spellingShingle DRNTU::Engineering::Industrial engineering::Quality engineering
Ou, Yanjing.
Development and evaluation of the control charts for variables
description In quality control (QC), control chart is one of the most effective tools to monitor the process and ensure the product quality. It is a powerful Statistical Process Control (SPC) method to make quick response when quality problems occur in order to avoid serious economic loss. The first objective of this PhD project is to develop new SPC techniques, for which several highly effective control charts for variables have been proposed and carefully investigated. The second task is to provide a systematic performance comparison among all typical control charts for variables including the Shewhart chart, Cumulative Sum (CUSUM) chart and Sequential Probability Ratio Test (SPRT) chart. These studies are conducted in two phases. The first phase presents the development of the control charts for monitoring process mean. The Syn- , optimal SPRT and VSI (Variable Sampling Interval) SPRT charts have been developed in Chapter 3. A systematic study has also been conducted to compare the effectiveness and robustness of nine typical control charts for monitoring the mean of variables in Chapter 4. The nine charts are categorized into three types (the type, CUSUM type and SPRT type) and three versions (the basic version, optimal version and fully-adaptive (FA) version). A design table has been made to facilitate the users to select a chart by taking into considerations of both performance and simplicity of the charts, as well as the probability distribution of the mean shift δµ of the process. The second phase presents the development of the control charts for monitoring both process mean and variance. The VSSI (Variable Sample Size and Sampling Interval) CUSUM and ABS (Absolute) SPRT charts have been developed in Chapter 5. This phase also studies the overall performance of nine typical control charts for monitoring process mean and variance in a quantitative and analytical manner in Chapter 6. A general model for the optimal designs of the control charts is adopted throughout this thesis. In this model, Average Extra Quadratic Loss (AEQL) is used as the objective function, in-control Average Time to Signal (ATS0) and inspection rate (R) are the constraints. It is expected that the development of the new charts and the systematic comparative studies carried out in this thesis will make useful contribution to the literature and practice of quality engineering.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Ou, Yanjing.
format Theses and Dissertations
author Ou, Yanjing.
author_sort Ou, Yanjing.
title Development and evaluation of the control charts for variables
title_short Development and evaluation of the control charts for variables
title_full Development and evaluation of the control charts for variables
title_fullStr Development and evaluation of the control charts for variables
title_full_unstemmed Development and evaluation of the control charts for variables
title_sort development and evaluation of the control charts for variables
publishDate 2013
url http://hdl.handle.net/10356/51178
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