Dissertations / Theses: 'Flexible manufacturing'

1

Aluskan, Aziz Batur. "Emulated Flexible Manufacturing Facility." [Florida] : State University System of Florida, 1999. http://etd.fcla.edu/etd/uf/1999/amj9902/aluskan.pdf.

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Thesis (M.S.)--University of Florida, 1999.
Title from first page of PDF file. Document formatted into pages; contains x, 90 p.; also contains graphics. Vita. Includes bibliographical references (p. 89).

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2

Scott, Wesley Dane. "A flexible control system for flexible manufacturing systems." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/158.

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A flexible workcell controller has been developed using a three level control hierarchy (workcell, workstation, equipment). The cell controller is automatically generated from a model input by the user. The model consists of three sets of graphs. One set of graphs describes the process plans of the parts produced by the manufacturing system, one set describes movements into, out of and within workstations, and the third set describes movements of parts/transporters between workstations. The controller uses an event driven Petri net to maintain state information and to communicate with lower level controllers. The control logic is contained in an artificial neural network. The Petri net state information is used as the input to the neural net and messages that are Petri net events are output from the neural net. A genetic algorithm was used to search over alternative operation choices to find a "good" solution. The system was fully implemented and several test cases are described.

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3

Fan, I.-P. "Intelligent flexible manufacturing system control." Thesis, Cranfield University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234483.

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Desai, Neha K. "Scheduling algorithm for flexible manufacturing cells." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23274.pdf.

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5

Washington, Lisa Anne. "Effectiveness analysis of flexible manufacturing systems." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15317.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.
Bibliography: leaves 112-114.
by Lisa Anne Washington.
M.S.

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6

Lee, Bill W. J. "The cost conflicts of flexible manufacturing." Thesis, University of Bath, 1993. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306834.

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Scott, Peter. "Craft skills in flexible manufacturing systems." Thesis, University of Bath, 1987. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377776.

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8

Dadone, Paolo. "Fuzzy Control of Flexible Manufacturing Systems." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36531.

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Flexible manufacturing systems (FMS) are production systems consisting of identical multipurpose numerically controlled machines (workstations), automated material handling system, tools, load and unload stations, inspection stations, storage areas and a hierarchical control system. The latter has the task of coordinating and integrating all the components of the whole system for automatic operations. A particular characteristic of FMSs is their complexity along with the difficulties in building analytical models that capture the system in all its important aspects. Thus optimal control strategies, or at least good ones, are hard to find and the full potential of manufacturing systems is not completely exploited.

The complexity of these systems induces a division of the control approaches based on the time frame they are referred to: long, medium and short term. This thesis addresses the short-term control of a FMS. The objective is to define control strategies, based on system state feedback, that fully exploit the flexibility built into those systems. Difficulties arise since the metrics that have to be minimized are often conflicting and some kind of trade-offs must be made using "common sense". The problem constraints are often expressed in a rigid and "crisp" way while their nature is more "fuzzy" and the search for an analytical optimum does not always reflect production needs. Indeed, practical and production oriented approaches are more geared toward a good and robust solution.

This thesis addresses the above mentioned problems proposing a fuzzy scheduler and a reinforcement-learning approach to tune its parameters. The learning procedure is based on evolutionary programming techniques and uses a performance index that contains the degree of satisfaction of multiple and possibly conflicting objectives. This approach addresses the design of the controller by means of language directives coming from the management, thus not requiring any particular interface between management and designers.

The performances of the fuzzy scheduler are then compared to those of commonly used heuristic rules. The results show some improvement offered by fuzzy techniques in scheduling that, along with ease of design, make their applicability promising. Moreover, fuzzy techniques are effective in reducing system congestion as is also shown by slower performance degradation than heuristics for decreasing inter- arrival time of orders. Finally, the proposed paradigm could be extended for on-line adaptation of the scheduler, thus fully responding to the flexibility needs of FMSs.

Master of Science

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9

Mather, Charles. "Flexible manufacturing in Vancouver's clothing industry." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28112.

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Flexible production techniques have been implemented in a number of industries in response to the crisis following the long post World War Two boom. These new methods have recently captured the attention of social scientists from a broad range of perspectives. In the large North American automobile industry, where flexible manufacturing is best documented, firms are introducing programmable equipment, work teams are replacing the assembly line, inventories are kept at a minimum, improving turnaround time and quality are important goals, and markets are smaller as specific consumers are targeted. However, it is becoming increasingly clear that the experience of the automobile industry is not representative of other manufacturing sectors. The implementation of the new techniques is likely to be different where the organisation of production is different, the structure of the industry is less concentrated, and where norms of consumption are distinct. This thesis focuses on the clothing industry in Vancouver, British Columbia. For this study, interviews were conducted with fourteen clothing firms in the city, ten workers (most of whom were Chinese female immigrants), union officials, equipment salespeople and a government official. The primary research question was to understand the pervasiveness of the new techniques and their effects on workers and the industry in Vancouver. The results of this study suggest that it is overwhelmingly the very large fashion firms that have invested in flexible machinery. These firms are large enough to lay out the capital for the new machines which improve turnaround time and flexibility, both vital for manufacturers of fashion apparel. A second advantage of the equipment for factory owners is that it reduces their dependence on skilled male workers who command the highest wages on the shop floor. For women workers in the industry (machinists), the new machines simply speed up work, making an already debilitating job worse. On the other hand, many smaller fashion firms are unable to raise the capital for the equipment even though the potential benefits are significant. In addition, standardised clothing manufacturers in Vancouver have not purchased the new technology because it does not suit their needs. Firms without the new technology weather downturns in the economy primarily through workers in the secondary labour market, which, in Vancouver is dominated by immigrant women. At this stage it seems that are barriers to the widespread implementation of flexible equipment in Vancouver clothing industry.
Arts, Faculty of
Geography, Department of
Graduate

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10

Salzman, Rhonda A. (Rhonda Ann) 1978. "Manufacturing system design : flexible manufacturing systems and value stream mapping." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/82697.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references.
by Rhonda A. Salzman.
S.M.

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11

Chen, Yufeng. "Optimal supervisory control of flexible manufacturing systems." Thesis, Paris, CNAM, 2015. http://www.theses.fr/2015CNAM0990/document.

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Notre thèse est consacrée à l’étude de la supervision des réseaux de Petri en vue de la conception de systèmes manufacturiers flexibles. L’objectif est la définition de stratégies de pilotage en ligne pour l’évitement de conflits et d’interblocages, dans le cadre de la théorie de la supervision. Le point de départ de notre travail est d’exploiterle graphe de marquage du réseau de Petri, ce qui permet en particulier d’obtenir des stratégies de commande maximalement permissive pour des problèmes d’évitement de conflits et d’interblocages. Nous avons ainsi introduit des techniques originales, manipulations d’inégalités ou réductions d’ensembles de marquages, destinées à diminuerla complexité algorithmique d’une telle méthode. Dans premier temps, nous avons focalisé sur la synthèse de superviseurs dits purs, ce qui correspond au cas particulier où l’ensemble de marquage légaux, est convexe.Cette optimisation est ensuite considérée du point de vue de la facilité de mise en oeuvre. Nous traitons ainsi de la minimisation de la structure du superviseur et de son coût d’implémentation en préservant une structure de supervision qui offre à la fois la permissivité maximale et une complexité de calcul raisonnable en vue d’utilisationsur des installations réelles. Aussi, nous avons cherché à réduire le nombre de places de contrôle nécessaires pour réaliser un superviseur maximalement permissif, pour cela nous avons formule le calcul du nombre minimal de places de contrôle en termes d’un problème de programmation linéaire. Afin d’affaiblir la complexité de ce calcul de superviseur, deux versions de l’algorithme sont proposées. Ce problème de minimisation de la taille dusuperviseur, quoique fondamental, n’est pas abordé aussi directement dans la littérature. Il s’agit là d’une première contribution.Dans u second temps, nous nous sommes intéressés aux réseaux de Petri à boucles (self-loops). Les boucles étant représentées par une variable qui s’ajoute dans la contrainte inégalité définissant l’ensemble de marquages légaux. Après avoir proposé une méthode de réduction du nombre d’inégalités ainsi que du superviseur optimalen se basant sur les approches et résultats précédents, nous avons établi une condition suffisante d’obtention d’un superviseur maximalement permissif permettant de traiter des ensembles de marquages légaux non convexes.Enfin nous proposons une méthode de synthèse de contrôleur pour une nouvelle classe de réseaux de Petri, avec des arcs inhibiteurs correspondant à des contraintes définies par des intervalles. La taille du contrôleur ainsi obtenu et défini en termes d’arcs inhibiteurs à intervalles s’en trouve réduite ainsi que par conséquent sont coût d’implémentation
Reachability graph analysis is an important technique for deadlockcontrol, which always suffers from a state explosion problem since it requires togenerate all or a part of reachable markings.Based on this technique, an optimal or suboptimal supervisor with high behavioralpermissiveness can always be achieved. This thesis focuses on designing liveness enforcing Petri net supervisors for FMSs by considering their behavioralpermissiveness, supervisory structure, and computationnal complexity.The following research contributions are made in this thesis.1. The design of a maximally permissive liveness-enforcing supervisor for an FMSis proposed by solving integer linear programming problems (ILPPs).2. Structural complexity is also an important issue for a maximally permissivePetri net supervisor. A deadlock prevention policy for FMSs is proposed, which canobtain a maximally permissive liveness-enforcing Petri net supervisor while thenumber of control places is compressed.3. In order to overcome the computational complexity problem in MCPP and ensurethat the controlled system is maximally permissive with a simple structure, wedevelop an iterative deadlock prevention policy and a modified version.4. We consider the hardware and software costs in the stage of controlimplementation of a deadlock prevention policy, aiming to obtain a maximallypermissive Petri net supervisor with the lowest implementation cost. A supervisorconsists of a set of control places and the arcs connecting control places totransitions. We assign an implementation cost for each control place and controland observation costs for each transition. Based on reachability graph analysis,maximal permissiveness can be achieved by designing place invariants that prohibitall FBMs but no legal markings.5. Self-loops are used to design maximally permissive supervisors. A self-loop ina Petri net cannot be mathematically represented by its incidence matrix. Wepresent a mathematical method to design a maximally permissive Petri netsupervisor that is expressed by a set of control places with self-loops. A controlplace with a self-loop can be represented by a constraint and a selfloopassociated with a transition whose firing may lead to an illegal marking

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12

Gupta, Avaneesh. "Characterization and measurement of manufacturing flexibility for production planning in high mix low volume manufacturing system /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202004%20GUPTA.

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13

Ng, Koon-hung, and 吳冠雄. "Dynamic process planning for flexible manufacturing cells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31240823.

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Ng, Koon-hung. "Dynamic process planning for flexible manufacturing cells /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22029709.

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15

Roth, Aleda V. "Strategic planning for the optimal acquisition of flexible manufacturing systems technology." Connect to resource, 1986. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=osu1262794556.

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16

丘杰 and Jie Qiu. "Scheduling flexible manufacturing systems using fuzzy heuristics." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31244671.

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17

Wybrow, M. "An ultrasonic recognition system for flexible manufacturing." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381070.

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18

Farshbaf, Mohamad Reza. "Mixed metal forming/machining flexible manufacturing system." Thesis, Open University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277924.

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19

Rogers, Paul. "Object-oriented modelling of flexible manufacturing cells." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276540.

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Lap-Keung, Chu. "Design and operation of flexible manufacturing cells." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276498.

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21

Doulgeri, Z. "Production scheduling policy for flexible manufacturing systems." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/38292.

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Altobelli, Frank Robert. "Flexible manufacturing systems and the housing industry." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43352.

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23

Whitehead, Jonathan David. "Scheduling and layout in flexible manufacturing systems." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/50617/.

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This thesis covers a variety of inter-related scheduling and layout issues encountered in flexible manufacturing systems. The principal focus is upon systems which adopt the commonly implemented loop layout configuration. A pivotal idea behind the work is that products must revisit machines during their manufacture. The work encompasses both computational and theoretical results. The computational work consists of testing both new and standard heuristic and local search techniques on two strongly NP-hard combinatorial optimisation problems, one related to layout and the other to single machine scheduling. In the layout problem, machines must be sequenced around a loop of conveyor belt with the objective of minimising the amount of movement carried out by the worst affected product type within the manufacturing system. In the single machine scheduling problem, coupledoperation jobs must be scheduled so that the maximum completion time on the machine, the makespan, is minimised; each coupled-operation job consists of two arbitrary processing time operations separated by a time lag that is bounded both below and above. Our results suggest that local search techniques, while well suited to standard search spaces, do not perform well when the search space contains infeasible neighbours and the cost of evaluating candidate solutions is high. The theoretical work stems from the repetitive manufacture of single product types in loop layout flexible manufacturing systems. We demonstrate that in such a system, the efficiency is strongly governed by the balance of workloads on the machines. We develop mixed integer programming models for tool allocation and machine sequencing with the objective of balancing workloads, and as a secondary criterion, minimising product movement. Focusing on a single machine, we study the computational complexity of a class of coupled-operation scheduling problems; each job consists of two unit processing time operations separated by a fixed delay of two units of time, and their order of production is restricted by precedence constraints. For several standard scheduling objective functions, we provide either polynomial algorithms or proof of NP-hardness for parallel chain and tree precedence constraints.

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Dhooky, Aruna N. D. "Development of a flexible manufacturing system (FMS)." Master's thesis, University of Cape Town, 2004. http://hdl.handle.net/11427/5572.

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Includes bibliographical references.
This report describes how the latest technology in computing and interfacing has been used in a traditional manufacturing environment to integrate old stand-alone CNC machines, a FANUC robot, a conveyor and a Robot Positioning Device (RPD) into a Flexible Manufacturing System (FMS). Also described are the benefits that South African manufacturers still using old CNC machines could achieve if they implemented a similar process in their organisation.

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Martin, Timothy Patrick. "Flexible manufacturing system software development using simulation." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/101236.

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This paper presents a hierarchical modeling method that can be used to simulate a Flexible Manufacturing System (FMS) at all levels of detail. The method was developed specifically to aid the software development needed for the hierarchy of computers that are present in an FMS. The method was developed by modeling an existing FMS. The models developed of the existing FMS are described in detail to provide an example of how to model other FMSs. The basic building blocks needed for designing other FMSs with this modeling method are provided. The models were written in the SIMAN simulation language. SIMAN was found to be an easy language to use for the hierarchical modeling of FMSs.
M.S.

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Granados, Fernández Víctor Hugo. "Modelling and optimization of flexible manufacturing systems." Master's thesis, Instituto Politécnico de Bragança, Escola Superior de Tecnologia e Gestão, 2012. http://hdl.handle.net/10198/7982.

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The Lagrangian relaxation method for solving a Mixed-Integer Linear Problem was implemented in order to improve the current TEMPO-PSI team exible manufacturing system solutions, available at the AIP-primeca pole in University of Valenciennes, France. The MILP optimization model, from TEMPO-PSI team, can not guarantee good results when the amount of jobs in the manufacturing system increases due to the growth in the number of variables of the model. A study on the optimization model was conducted with the objective to nd the candidate constraints for Lagrangian relaxation. A comparative study is made between the initial model solutions and Lagrange-relaxed model solutions. The results of the present research indicate that the use of the Lagrangian relaxation method on the scheduling problems could have advantages in obtaining better solutions. Um método relaxação lagrangeana para resolver um problema de Programação Misto- Inteira Linear foi implementado com o objetivo de melhorar as soluções actuais dos sistemas de manufatura exíveis da equipa TEMPO-PSI, disponível no laboratório AIPprimeca da Universidade de Valenciennes, França. O modelo de optimização MILP, da equipa TEMPO-PSI, não consegue garantir bons resultados quando a quantidade de operações no sistema de manufactura aumenta, devido ao crescimento do número de variáveis do modelo. O estudo do modelo de optimização foi levado a cabo com o objectivo de encontrar as restrições candidatas para a relaxação Lagrangeana. O estudo comparativo é feito entre as soluções iniciais do modelo e as soluções do modelo relaxado com o método de Lagrange. Os resultados da presente investigação indicam que o uso de método da relaxação Lagrangeana nos problemas de escalonamento de tarefas poderá ter vantagens na obtenção de melhores soluções.

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27

Mansour, Mohammad Ahmad Chaudhry Ghulam M. "A generalized simulation model for flexible manufacturing system." Diss., UMK access, 2005.

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Thesis (Ph. D.)--School of Computing and Engineering and Dept. of Mathematics. University of Missouri--Kansas City, 2005.
"A dissertation in engineering and mathematics." Advisor: Ghulam Chaudhry. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed June 26, 2006. Includes bibliographical references (leaves 341-346 ). Online version of the print edition.

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Fleischman, David R. "A data oriented approach to integrating manufacturing functions in flexible Manufacturing Systems." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23150.

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Computer Integrated Manufacturing (CIM) seeks to integrate computers into the manufacturing environment, with the end result being a more efficient and productive factory. Current approaches to CIM generally fail to truly integrate the various manufacturing functions (design, scheduling, planning, manufacture, business, etc.) and instead result in self-sufficient, computer- served 'islands of automation.' In these systems, data must be translated before moving from one manufacturing function to another. Wu and Madison have approached data modeling in a CIM environment from a new perspective. Their approach seeks to provide one data model that meets the needs of all manufacturing functions within a factory, negating the need for human or machine data translators. Keywords: Computer integrated manufacturing; Flexible manufacturing systems; Data modeling

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Ma, Xiaonan. "An approach to measure manufacturing system flexibility /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?IELM%202007%20MA.

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Cooper, D. J. "Realising flexibility through manufacturing simplification." Thesis, Cranfield University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379489.

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Hsu, Chih-hua. "Dynamic scheduling of manufacturing systems /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Brückner, Sven. "Return from the ant synthetic ecosystems for manufacturing control /." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=962331511.

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Tayanithi, Piyapan. "A new integrated framework for analyzing interruptions in a flexible manufacturing system." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/30997.

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Özbolat, Nida Kamil Süel Akın. "The debate on the transition to flexible production:A case study on manufacturing industry in Turkey and its provinces/." s.l.]: [s.n.], 2003. http://library.iyte.edu.tr/tezler/master/sehirplanlama/T000275.rar.

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Pardasani, Ajit Carleton University Dissertation Information and Systems Science. "Network flow optimization models for integrated flexible manufacturing systems." Ottawa, 1989.

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Ozpeynirci, Selin. "Allocation And Tooling Decisions In Flexible Manufacturing Systems." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12609161/index.pdf.

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In this thesis, we consider a capacity allocation problem in flexible manufacturing systems. We assume limited time and tool magazine capacities on the Computer Numerically Controlled (CNC) machines. We have a set of operations that have to be assigned to the machines and each operation requires a set of tools to be processed. Our problem is to allocate the available capacity of the CNC machines to operations and their required tools. We consider two problems in this study: maximizing the total weight of operations where there are a limited number of tools of each type available and maximizing total weight minus total tooling cost where the tools can be used or purchased at a cost. We model the problems as Integer Linear Programs and show that they are NP-hard in the strong sense. For the total weight problem, we propose upper bounds, branch and bound algorithm for exact solutions and several heuristics for approximate solutions. For the bicriteria problem, we use Lagrangean relaxation technique to obtain lower and upper bounds. Our computational results have revealed that all solution approaches give satisfactory results in reasonable times.

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Zhang, Wenle. "Scalable deadlock avoidance algorithms for flexible manufacturing systems." Ohio : Ohio University, 2000. http://www.ohiolink.edu/etd/view.cgi?ohiou1179862449.

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Selim, Hassan Mohamed. "A flexible cell formation approach for cellular manufacturing." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186350.

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Cell formation in cellular manufacturing deals with the identification of machines which can be grouped to create manufacturing cells as well as the identification of part families processed within each cell. Manufacturing flexibility is the property of the system components that are integrally designed and linked to each other in order to allow the adaptation to various tasks. This research focuses on classifying and quantifying several types of cellular manufacturing flexibility. These types are defined in order to respond to internal and external changes. Based on these definitions, we link components of the cellular manufacturing systems (part families and machine groups) to develop a CM flexibility hierarchy. Several cellular flexibility and structural measures are developed at each level of the CM flexibility hierarchy and for each component of the CM systems. These measures can be used in order to evaluate and/or design cellular manufacturing systems. A new cell formation method (Flexible Cell Formation method), which has several unique features, is developed. This method incorporates the flexibility measures in designing cellular systems and can generate several alternative designs with different levels of flexibility. The method developed also uses a new similarity measure which incorporates machine processing capability. The proposed method is compared to selected methods of cell formation. Finally, this research concludes with a comprehensive experimental analysis to investigate the impact of several input parameters. The results are used to show how each parameter should be set by the user of the method to incorporate specific types of flexibility.

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Chutima, Parames. "Real-time operational control of flexible manufacturing systems." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283404.

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Darvishi, Alireza. "Philosophy of fixture design for flexible manufacturing systems." Thesis, University of Leeds, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329682.

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Mohan, Sridhar. "Deadlock avoidance in mixed capacity flexible manufacturing systems." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000428.

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42

Caromicoli, Carl Adam. "Time scale analysis techniques for flexible manufacturing systems." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14705.

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Sierra, Maribel 1973. "Attracting new coating businesses by offering flexible manufacturing." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/84231.

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Thesis (S.M.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; in conjunction with the Leaders for Manufacturing Program at MIT, 2001.
Includes bibliographical references (leaves 82-83).
by Maribel Sierra.
S.M.

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Ko, Hong Seung. "Studies on Performance Analysis of Flexible Manufacturing Cells." Kyoto University, 1992. http://hdl.handle.net/2433/168755.

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本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである
Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第5117号
工博第1238号
新制||工||869(附属図書館)
UT51-92-J164
京都大学大学院工学研究科数理工学専攻
(主査)教授長谷川利治, 教授茨木俊秀, 教授片山徹
学位規則第4条第1項該当

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Xu, Dong. "Hardware-based Parallel Simulation of Flexible Manufacturing Systems." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28787.

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This research explores a hardware-based parallel simulation mechanism that can dramatically improve the speed of simulating flexible manufacturing systems (FMS) by applying appropriate enabling hardware technologies. The hardware-based parallel simulation refers to running a simulation on a multi-microprocessor integrated circuit board, called the simulator, which is specifically designed for the purpose of simulating a specific FMS. The board is composed of a collection of micro-emulators capable of mimicking the operation of equipment in FMS such as machining centers, transporters, and load/unload stations. To design possible architectures for the board, a mapping technology is applied by making use of the physical layout information of an FMS. Under such a mapping method, the simulation model is decomposed into a cluster of micro emulator on the board where each workstation is represented by one micro emulator. Three potential architectures for the proposed simulator, namely, the bus-based architecture, the shared-memory based architecture, and the parallel I/O port based architecture, are studied. To provide a suitable parallel computing platform, a prototype simulator based on the combination of the shared-memory and the parallel I/O port architecture is physically built. Besides the development of the hardware simulator, a time scaling simulation method is also developed for execution on the proposed simulator. The method uses the on-board digital clock to synchronize the parallel simulation being performed on different microprocessors. The advantage of the time scaling technology is that the sequence of simulation events is sorted naturally in consistent with the real events. In this way, no entangled waiting is needed as in the conservative parallel simulation methods so as to reduce the synchronization overhead and the danger of having deadlock. Experiments on the prototype simulator show that the time scaling simulation method, combined with the unique hardware features of the FMS specific simulator, achieves a large speedup compared to conventional software-based simulation methods.
Ph. D.

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46

Kean, Thomas Maxwell. "Supervisory computer control of a flexible manufacturing cell." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/27892.

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A combined software and hardware package has been developed which coordinates the activities of a Unimation PUMA 560 industrial robot and an ORAC CNC training lathe in a Flexible Manufacturing Cell environment under the supervision of a DEC VAX 11/750 computer. The hardware component is used to provide an intermediate interface between the VAX 11/750 software and the standard manual controls of the ORAC lathe. The interface to the PUMA robot is strictly software oriented and makes use of the Supervisor communication protocol provided by the robot's VAL II controller. The software package has been designed as a hierarchial, multi-tasking system to facilitate modular development and a logical division of labour. The hierarchy consists of three main levels, with the individual machine controllers providing the lowest level. At the middle layer is a number of subprocesses which execute on the VAX 11/750 and are each responsible for the direct supervision of one machine controller. This supervision involves both sending commands and receiving status messages in the native language of the individual controllers. At the top layer of the hierarchy is a single process which is responsible for the overall coordination of the workcell activities. Each subtask in the hierarchy communicates with its vertical neighbours through a series of communication protocols and command vocabularies developed for that purpose. Each subtask is also provided with a structured interface to the operator's console. This interface is implemented by a separate VAX process that provides a status window environment for each machine that is active in the cell, but also intercepts text messages and prompts so that they may be displayed to the operator one at a time. Two different software packages have been developed for the top layer of the hierarchy. The ORCAM package is dedicated to the task of automatically manufacturing turned components from a CAD database. The FMC package provides a flexible interface to each of the supported machines and may be used to supervise any number of user-defined tasks.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate

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47

Newman, Stephen Thomas. "The design of flexible machining cells." Thesis, Loughborough University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293138.

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48

Chen, Chin-Sheng. "Methodologies for manufacturing system selection and for planning and operation of a flexible manufacturing system." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/54242.

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A hierarchical methodology is developed for the overall design of manufacturing systems. The methodology consists of solutions to four levels of problems, namely, (1) manufacturing system selection, (2) shop loading, (3) machine loading and tool allocation, and (4) testing the feasibility of a schedule and determining strategies for the operational control of the system. Although these problem levels are developed in a hierarchical sense, they can be applied independently by assuming appropriate inputs to the problem level under consideration. The third and the fourth level problems are addressed in this research for the flexible manufacturing system. The first level of the hierarchical methodology addresses the problem of manufacturing system selection. The mathematical 4 model formulated for this problem captures the basic and integrated relationships among the systems and system components. This model provides a practical approach and a precise tool to determine an optimal mix of systems, to assign appropriate machines to each system, and to select the best material handling system for each system to best suit long-term production requirements at minimum costs. The second level of the hierarchical methodology addresses the shop loading problem. A mathematical model is developed for partitioning parts among the manufacturing systems selected at the first level to minimize total operating costs. For the third level problem, a mathematical model is formulated to obtain routings of parts through an FMS and to assign appropriate cutting tools to each machine in the system to minimize total machining cost. For the fourth level problem, a simulation model is developed for testing the feasibility of the solution obtained at the third level. It also helps to determine strategies for the operational control of the system. The computational experience with the mathematical models is presented using the MPSX-MIP/370 package. Sensitivity analysis is also performed to further understand system behavior under various operating conditions. Several new findings of the research are reported. Because of the special structure of the mathematical models, a computational refinement for their solution is also proposed based on Lagrangian relaxation.
Ph. D.

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49

Fenney, Lee. "Flexible high speed machinery." Thesis, Aston University, 1989. http://publications.aston.ac.uk/11882/.

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The thesis describes an investigation into methods for the design of flexible high-speed product processing machinery, consisting of independent electromechanically actuated machine functions which operate under software coordination and control. An analysis is made of the elements of traditionally designed cam-actuated, mechanically coupled machinery, so that the operational functions and principal performance limitations of the separate machine elements may be identified. These are then used to define the requirements for independent actuators machinery, with a discussion of how this type of design approach is more suited to modern manufacturing trends. A distributed machine controller topology is developed which is a hybrid of hierarchical and pipeline control. An analysis is made, with the aid of dynamic simulation modelling, which confirms the suitability of the controller for flexible machinery control. The simulations include complex models of multiple independent actuators systems, which enable product flow and failure analyses to be performed. An analysis is made of high performance brushless d.c. servomotors and their suitability for actuating machine motions is assessed. Procedures are developed for the selection of brushless servomotors for intermittent machine motions. An experimental rig is described which has enabled the actuation and control methods developed to be implemented. With reference to this, an evaluation is made of the suitability of the machine design method and a discussion is given of the developments which are necessary for operational independent actuators machinery to be attained.

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50

Ariffin, Saparudin bin. "Modelling and simulation in support of the design and construction of modular machine control system." Thesis, Loughborough University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336507.

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Dissertations / Theses on the topic 'Flexible manufacturing'

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