Quality control and maintenance float models in unreliable flexible manufacturing systems.
Item
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Title
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Quality control and maintenance float models in unreliable flexible manufacturing systems.
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Identifier
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AAI9304693
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identifier
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9304693
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Creator
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Lin, Chinho.
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Contributor
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Advisers: Georghios Sphicas | William Chien | Lie-Fern Hsu
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Date
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1992
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Language
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English
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Publisher
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City University of New York.
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Subject
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Business Administration, Management | Engineering, Industrial | Operations Research
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Abstract
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This dissertation investigates two reliability issues pertaining to flexible manufacturing systems (FMS): the reliability of the manufactured products and the reliability of the equipment.;In studying the product reliability, we model the system as an open queueing network and derive the relationships between inspection rates and operational characteristics of the FMS. This study deals with the working, reworking, partial scrapping, and in-process inspection issues. Based on the results of our study, we have found that incorporating an appropriate in-process quality control policy can improve the quality level and enhance the revenue of the FMS. Therefore, we conclude that building a quality control system within the FMS is a viable alternative to the much more expensive zero-defect technology to ensure product reliability.;For the equipment reliability, a model is proposed to deal with the maintenance float of the key flexible manufacturing cell (FMC) and the repair system of the FMS. A systematic approach is proposed, which combines the simulation, Taguchi design, regression and classical queueing models. This approach is useful in determining the expression of the fractional utilization of the system. These models are then used to determine the optimal (or near-optimal) number of floats of the module in a key flexible manufacturing cell and the optimal (or near-optimal) capacity of repair stations in the FMS. The benefits of the approach are: (1) Flexibility of simulation by not requiring some of the restrictive assumptions made in analytical models; (2) Reduction of the amount of work needed inorder to obtain a reliable and applicable model; and (3) Savings in time and cost by not requiring to run full-scale simulation experiments, as a result of adopting the Taguchi experiment design. Furthermore, this approach provides a guide and reference source for operations managers and industrial practitioners involved in design and planning problems of maintenance float systems. It also serves as an alternative to dealing with the intricate issues existing in complex stochastic models. (Abstract shortened by UMI.).
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
