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A COST BASED GROUPING HEURISTIC IN GROUP TECHNOLOGYChiu, Kuohung Simon, 1959- January 1987 (has links)
This thesis proposes a cost based grouping procedure for Group Technology. The procedure is a two-stage graph partitioning approach to determine machine cells. Costs of work-in-process inventory, machine depreciation, machine setup and material handling are used as a basis for grouping. The procedure begins by selecting economic lot sizes for each part type and converting these values to machine requirements. The first stage assigns parts to machines of a common type. The second stage groups individual machines to cells, with each machine cell having a number of machines between chosen lower and upper limits. An additional check is given to the final groupings to see if adding a machine of any type can result in savings on the intergroup material handling cost. The process may iterate by next obtaining updated setup times and restarting.
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An automated storage and retrieval system for use in a flexible manufacturing cellCorsaro, Livio Fabio January 1997 (has links)
A dissertation submitted to the Faculty of Engineering, University of the
Witwatersrand, in fulfilment of the requirements for the degree of Master of
Science in Engineering. / The requirement of the project was to design an automatic storage and retrieval
system (AS/RS) to be incorporated into a flexible manufacturing cell (FMC) at the
University of the Witwatersrand. This flexible manufacturing cell currently being
developed in the Industrial engineering department consists of a CNC milling
machine and a CNC turning centre supported by an automated materials handling
system, and an integrated computer control system. The automated materials
handling system consists of a loop conveyor, parts transfer device, tool changing
robot and the AS/RS. All the devices of the materials handling system have been
constructed from low cost items readily available or alternatively have been
manufactured at the University. The research philosophy adopted was to produce a
low cost FMC, using local technology and expertise, to produce a system that is both
economically feasible and relatively simple to implement.
The AS/IRS is computer controlled consisting of three axis, driven by direct current
motors. The AS/RS has a storage matrix of sixteen pallets (four by four) and is able
to operate autonomously. The controlling software was written in turbo Pascal and
designed to allow interface with the other material handling devices. The software
allows for future incorporation of scheduling rules such as first in first out, shortest
operating time or a schedule desired by the user. The AS/RS also allows the system
to generate managerial reports on the status of the system as well as feedback to
the FMC supervisory computer.
The design was carried out with the same philosophy used In the FMC i.e, to use
low cost items to provide an economically feasible design that is both flexible yet
simple to incorporate within a FMC.
In conclusion the AS/RS performs the required pick and place function with sufficient
accuracy to ensure that parts are correctly positioned. The controlling program of the
AS/RS functions correctly in terms of controlling the AS/RS. The AS/RS is fully
autonomous in all operations.
The AS/RS has the following specifications :
Value Units
Accuracy 3.67 mm
Repeatability 7.2 mm
Resolution 0.00977 mm
Average pick & place time 41.6 s
X Axis travel 1000 mm
Y Axis travel 640 mm
Z Axis travel 420 mm
Lifting capacity 20 N
Gripping force 10 N
Degrees of freedom 3
The design can be further improved by using stepper motors instead of direct
current motors to provide a finer control in terms of velocity and position accuracy.
A!though the stepper motors need to have the same price for performance characteristics. / AC 2018
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Iterative methods and analytic models for queueing and manufacturing systems. / CUHK electronic theses & dissertations collectionJanuary 1998 (has links)
by Wai Ki Ching. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references (p. 82-87). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.
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Systems aspects of flexible automated manufacturing networks : final reportJanuary 1982 (has links)
by Stanley B. Gershwin ... [et al.] / Final report. / Bibliography: p. 80-83. / "April, 1982." / National Science Foundation Grant DAR78-17826
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Adaptive tool selection strategies for drilling in flexible manufacturing systemsChander, Karthik Balachandran 30 September 2004 (has links)
The thesis presents an approach to adaptive decision making strategies to reduce bottlenecks in a drilling operation and to extend tool life. It is an attempt to portray the real drilling system in a typical Flexible Manufacturing System (FMS) layout. The system designed serves as back end intelligence to drilling machines (INTELLIDRILL) in a Flexible Manufacturing System for making dynamic and real time decisions. INTELLIDRILL uses mathematical and adaptive tool reliability models to simulate the machining conditions and tool availability for an operation based on history of tool failures. The results are used to compute the machining parameters and the tools required for an operation. INTELLIDRILL can devise strategies for different tool materials to operate on batches of different materials. INTELLIDRILL decisions could lead to significant savings in tooling costs and reduction in flow line bottlenecks.
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Developing high performance manufacturing systemsKarlsson, Anders January 2002 (has links)
The work detailed in this dissertation relates to thedevelopment of high performance manufacturing systems. Theperformance factor aimed for is especially flexibility, butthere is an intention of making the results adaptable to focuson performance factors of the readers or users choice. Thefocus of the presented research is not only to provide meansfor accomplishing manufacturing that can handle changes butalso to accomplish flexibility in another area. The resultsshould be applicable in many different situations. The researchhas been divided into three parts: the further development of amanufacturing strategy, the development of a base for amanufacturing system design method and the development of amanufacturing control system. The developed strategy is called Assembly-InitiatedProduction (AIP). An implementation of the strategy shouldprovide high manufacturing system flexibility but at the sametime contribute to the lowering of inventory levels andlead-times. Different solutions coupled to technicalrequirements found are also discussed. The design method research focuses on basic manufacturingsystem properties and the possibility of expressing theseproperties by using simple combinable abstract units calledconcepts. The principle is the same as in physics where realworld phenomena may be expressed by using standard concepts asfor example time and mass. The intended use of the results isin an early manufacturing system design phase. The method isnot directly linked to the AIP strategy, but could be used forimplementing it. Production Planning and Control (PPC) is an important partof a manufacturing system. After having reviewed current PPCpractices, a need for a factory floor PPC system workingregardless of factory floor layout, was identified. Based ontheoretical and industrial studies, the suggested solution is acomputerised, decentralised control system, physicallyseparated from the PPC/ERP system. In order to be able to makequick changes in the schedule, to obtain flexibility and toprovide the organisation with a tool for manufacturing controland decision-making, the system works in real time to provideaccurate and valid data.
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Adaptive tool selection strategies for drilling in flexible manufacturing systemsChander, Karthik Balachandran 30 September 2004 (has links)
The thesis presents an approach to adaptive decision making strategies to reduce bottlenecks in a drilling operation and to extend tool life. It is an attempt to portray the real drilling system in a typical Flexible Manufacturing System (FMS) layout. The system designed serves as back end intelligence to drilling machines (INTELLIDRILL) in a Flexible Manufacturing System for making dynamic and real time decisions. INTELLIDRILL uses mathematical and adaptive tool reliability models to simulate the machining conditions and tool availability for an operation based on history of tool failures. The results are used to compute the machining parameters and the tools required for an operation. INTELLIDRILL can devise strategies for different tool materials to operate on batches of different materials. INTELLIDRILL decisions could lead to significant savings in tooling costs and reduction in flow line bottlenecks.
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Developing high performance manufacturing systemsKarlsson, Anders January 2002 (has links)
<p>The work detailed in this dissertation relates to thedevelopment of high performance manufacturing systems. Theperformance factor aimed for is especially flexibility, butthere is an intention of making the results adaptable to focuson performance factors of the readers or users choice. Thefocus of the presented research is not only to provide meansfor accomplishing manufacturing that can handle changes butalso to accomplish flexibility in another area. The resultsshould be applicable in many different situations. The researchhas been divided into three parts: the further development of amanufacturing strategy, the development of a base for amanufacturing system design method and the development of amanufacturing control system.</p><p>The developed strategy is called Assembly-InitiatedProduction (AIP). An implementation of the strategy shouldprovide high manufacturing system flexibility but at the sametime contribute to the lowering of inventory levels andlead-times. Different solutions coupled to technicalrequirements found are also discussed.</p><p>The design method research focuses on basic manufacturingsystem properties and the possibility of expressing theseproperties by using simple combinable abstract units calledconcepts. The principle is the same as in physics where realworld phenomena may be expressed by using standard concepts asfor example time and mass. The intended use of the results isin an early manufacturing system design phase. The method isnot directly linked to the AIP strategy, but could be used forimplementing it.</p><p>Production Planning and Control (PPC) is an important partof a manufacturing system. After having reviewed current PPCpractices, a need for a factory floor PPC system workingregardless of factory floor layout, was identified. Based ontheoretical and industrial studies, the suggested solution is acomputerised, decentralised control system, physicallyseparated from the PPC/ERP system. In order to be able to makequick changes in the schedule, to obtain flexibility and toprovide the organisation with a tool for manufacturing controland decision-making, the system works in real time to provideaccurate and valid data.</p>
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An empirical investigation of manufacturing flexibility and organizational performance as moderated by strategic integration and organizational infrastructureRogers, Pamela Rose Patterson. White, Richard E., January 2008 (has links)
Thesis (Ph. D.)--University of North Texas, Aug., 2008. / Title from title page display. Includes bibliographical references.
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An agent based infrastructure for manufacturing cell control /Fan, Chi-kit. January 2001 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2002. / Includes bibliographical references.
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