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Abstract
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Article Information:
Design of EWMA Control Charts for Assuring Predetermined Production Process Quality
Jitao Fang, Hui Wang and Weiwei Deng
Corresponding Author: Jitao Fang
Submitted: September 16, 2012
Accepted: November 01, 2012
Published: March 25, 2013 |
Abstract:
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In this study, we establish the relationship model in process capability indices, the coefficient of process shift and quality target utilizing statistical tolerance technology. A new systematic method for concurrent design of process quality, Statistical Tolerance (ST) and control chart is presented. A set of standardized Process Quality Indices (PQIs) for variables is introduced for meeting the measurement and evaluation to process yield, process centering and quality loss. To develop a quality-oriented SPC approach, a standardized interface between process quality indices system and the parameter design of EWMA control charts is needed. The two-dimensional array form ST (Cp*, &delta*) is presented for selecting a set of parameters (&lambda, L) with suitable ARL0 and ARL1 to realize the optimal control for a process toward a predetermined quality target. The ST (Cp*, k*) will be the guideline to form the restriction of the centerlines of the control charts for assuring the preset PQIs. If the process statistical parameters are unknown, (Cp*, k*) will be converted into the ST form for estimated values based on a required confidence probability. A case study shows the detail procedure of this concurrent design for PQIs, ST and SPC parameters.
Key words: Concurrent design, EWMA control chart, process quality, statistical tolerance, , ,
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Cite this Reference:
Jitao Fang, Hui Wang and Weiwei Deng, . Design of EWMA Control Charts for Assuring Predetermined Production Process Quality. Research Journal of Applied Sciences, Engineering and Technology, (10): 3010-3014.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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