To see the other types of publications on this topic, follow the link: Manufacturing planning and control.
Dissertations / Theses on the topic 'Manufacturing planning and control'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Manufacturing planning and control.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Yang, Yihong. "Integrated quality control planning in computer-aided manufacturing planning." Worcester, Mass. : Worcester Polytechnic Institute, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-041607-164054/.
Full textAbstract:
Thesis (Ph. D.)--Worcester Polytechnic Institute.Keywords: In-process inspection; tolerance assignment; tolerance stack-up analysis; quality control planning. Includes bibliographical references (leaves 136-148).
2
Olson, Dana Marc. "Implementing lean manufacturing tools in a small manufacturing environment." Menomonie, WI : University of Wisconsin--Stout, 2004. http://www.uwstout.edu/lib/thesis/2004/2004olsond.pdf.
Full text
3
Chan, Wai Kuen. "Configurations in manufacturing planning and control (MPC) systems : manufacturing environment perspective." Thesis, Loughborough University, 2001. https://dspace.lboro.ac.uk/2134/7531.
Full textAbstract:
The quest for a viable manufacturing planning and control (MPQ system that supports organizational strategy is a crucial issue in operations management. Previous studies on MPC discipline have paid little attention on the basic performance differences that associated with strategic and organization environmental issues. This thesis addresses these issues by exploring the configurations in MPC systems in a macro perspective that integrates several areas, namely: organizational environment, competitive strategy, manufacturing strategy, supply chains, NIPC system and organizational performance. This thesis attempts to shift the conventional research focus of NTC processes and mechanisms to enviromnent-strategy-system-performance (E-S-S-P) paradigm. In this respect, the configurational research in WC systems requires the study of a wider body of knowledge (Chapters 2- 5) including: (1) a detailed assessmenot f the current state-of-the art of MPC practices; (2) the review of the relations between strategies and MPC systems; (3) a study of organization environmental variables and their influences; and (4) an identification of methodological issues relating to configuration research. Thirty hypothesized relationships are proposed (Chapter 6) and tested (Chapters 8 and 9). The research methodology has been concentrated in three distinctive areas. The first area is in the design of instruments (Chapter 7) for the measurement of manufacturing environments, competitive strategy, manufacturing strategy, and MPC systems in several manufacturing industries. Five databases are gathered to test the hypotheses, i.e. trade census and industrial production statistics, published business data, published survey data (for content analysis), data from field visits, and questionnaire survey data. The second area is the construction of a 3-dimensional organization environment (Chapter 7). Besides, a reference model is proposed that takes into account of the theory of autopoiesis and enacted environment, based on several field visits (Chapter 8). The third area is the study of correlations between the organizational environment, competitive strategy, manufacturing strategy, and NIPC systems (Chapter 9). The quantitative analyses are used such as Pearson correlation, linear regression, and causal modeling. There are seven main contributions of this thesis: (1) It is the first study of the configurations in NTC systems that will have significant theoretical implications for the development of NTC practices. (2) It develops the network relationships of E-S-S-P research paradigm. (3) It broadens the knowledge in operations management by exploring the hypothesized relations between organizational environment, strategies, supply chains and MPC systems. (4) It shows the adoption of new thinking, i. e. the theory of autopoiesis, in the configuration study. (5) It develops a reference MPC model that adds to the body of knowledge in this discipline. (6) It constructs the task environment classification framework for the study related to manufacturing environment in Hong Kong. (7) It proposes path modelling analysis to explore the causal relationships of WC system and other organizational variables, which is rarely applied in this field.
4
Karimabady, Houman. "Control of small manufacturing systems." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363248.
Full text
5
Kang, Dilbir. "A capacity planning system for bespoke manufacturing." Thesis, University of Huddersfield, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293378.
Full textAbstract:
The majority of the commercially available systems developed for capacity planning have been designedf or organisationsw hich are involved with make-to-stockm anufacturingT. heses ystemsa re difficult to implementi n bespokem anufacturing( make-to-ordero) rganisationss ince they are unable to accommodateth e requirementso f the volatile productione nvironment. This thesisi dentifies the uniqueo peratingc haracteristicos f the manufacturinge nvironmenta ssociated with bespokem anufacturingw hich caused ifficulty with the implementationo f commerciallya vailable systemsT. he findings from this investigationa re usedt o formulatea design for a capacityp lanning systemw hich fulfils the unique requirementso f the bespokem anufacturinge nvironment. The proposed system executes the capacity planning function at two separate levels of detail by integrating rough cut capacity planning with finite capacity planning. The two planning mechanisms are also integrated with a shop floor data collection system which has been designed for the assembly environment. Data interaction is achieved between the capacity planning modules and the shop floor data collection system via an Interface ManagemenSt ystem which ensurest hat the scheduled ata containedi n the individual systemsr emainsi n synchronisationa t all times. The capacity planning system also includes the design and development of a large scale display facility which is able to accommodateth e large volume of scheduled ata required to be viewed for finite capacity planning. This facility has been designed using multiple co-ordinated screens which are linked by a local area network. A data interface and parallel processing facility is incorporated in the design which enable the processing of a software application to be distributed over multiple nodes.
6
Berry, Stuart. "Production planning and control in small manufacturing firms." Thesis, University of Derby, 1999. http://hdl.handle.net/10545/305076.
Full text
7
Byrne, M. D. "A search simulation approach to manufacturing planning and control." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381204.
Full text
8
Ford, Derek William. "The next generation planning board : a visible solution for effective manufacturing planning and control for a process manufacturing environment." Thesis, Cranfield University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393696.
Full text
9
Rashdi, Pir Roshandin Shah Rashdi. "The manufacturing planning and control of make-to-order companies." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309549.
Full text
10
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.
Full text
11
Pandya, Kaushik Vinodrai. "Investigations of generic communications standards for production planning and control systems." Thesis, Teesside University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304639.
Full text
12
Evans, Clive R. "Computer-assisted production scheduling, planning and control in foundries." Thesis, Aston University, 1987. http://publications.aston.ac.uk/11850/.
Full textAbstract:
The present study describes a pragmatic approach to the implementation of production planning and scheduling techniques in foundries of all types and looks at the use of `state-of-the-art' management control and information systems. Following a review of systems for the classification of manufacturing companies, a definitive statement is made which highlights the important differences between foundries (i.e. `component makers') and other manufacturing companies (i.e. `component buyers'). An investigation of the manual procedures which are used to plan and control the manufacture of components reveals the inherent problems facing foundry production management staff, which suggests the unsuitability of many manufacturing techniques which have been applied to general engineering companies. From the literature it was discovered that computer-assisted systems are required which are primarily `information-based' rather than `decision based', whilst the availability of low-cost computers and `packaged-software' has enabled foundries to `get their feet wet' without the financial penalties which characterized many of the early attempts at computer-assistance (i.e. pre-1980). Moreover, no evidence of a single methodology for foundry scheduling emerged from the review. A philosophy for the development of a CAPM system is presented, which details the essential information requirements and puts forward proposals for the subsequent interactions between types of information and the sub-system of CAPM which they support. The work developed was oriented specifically at the functions of production planning and scheduling and introduces the concept of `manual interaction' for effective scheduling. The techniques developed were designed to use the information which is readily available in foundries and were found to be practically successful following the implementation of the techniques into a wide variety of foundries. The limitations of the techniques developed are subsequently discussed within the wider issues which form a CAPM system, prior to a presentation of the conclusions which can be drawn from the study.
13
Ren, Lan. "Integrated process planning for a hybrid manufacturing system." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Ren_09007dcc8046714a.pdf.
Full textAbstract:
Thesis (Ph. D.)--Missouri University of Science and Technology, 2008.Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 18, 2008) Includes bibliographical references.
14
He, Naihui. "Agent-based hierarchical planning and scheduling control in dynamically integrated manufacturing system." Thesis, University of Exeter, 2011. http://hdl.handle.net/10036/3207.
Full textAbstract:
It has been broadly recognised that today’s manufacturing organisations face increasing pressures from continuous and unexpected changes in the business environment such as changes in product types, changes in demand pattern, changes in manufacturing technologies etc. To enable manufacturing organisations to rapidly and timely deal with these changes, operational decisions (e.g., process planning and production scheduling) have to be integrated with dynamic system restructure or reconfiguration so that manufacturing organisations do not only use the flexible resource utilisations to deal with these changes, but also can dynamically reconfigure their existing system structures in response these changes. A manufacturing system concept and implementation methodology is proposed by the Exeter Manufacturing Enterprise Centre (XMEC), which is called the Dynamically Integrated Manufacturing System (DIMS). The overall aim of DIMS is to provide a systematic modelling and control framework in which operational decisions can be integrated with the dynamic system restructuring decisions so as to help manufacturing systems to dynamically deal with changes in the business environment. This PhD research is a part of DIMS research, which focuses on the investigation on operational control in DIMS. Based on the established agent-based modelling architecture in DIMS, this research develops two agent bidding mechanisms for the hierarchical control of production planning and scheduling. These two mechanisms work together to assist manufacturing systems in making optimal and flexible operational decisions in response to changes in the business environment. The first mechanism is the iterative agent bidding mechanism based on a Genetic Algorithm (GA) which facilitates the determination of the optimal or near optimal allocation of a production job containing a set of sub-jobs to a pool of heterarchical resources. The second mechanism is the hierarchical agent bidding mechanism which enables product orders to be cost-efficiently and flexibly planned and scheduled to meet the orders’ due dates. The novelty of this mechanism is that it enables orders to be fulfilled within structural constraints of manufacturing systems as far as possible and however enables resources to be regrouped flexibly across system boundaries when orders cannot be fulfilled within structural constraints of manufacturing systems.
15
Lassila, Anna-Maija. "Reference architecture for configuration, planning and control of 21st century manufacturing systems." Thesis, Sheffield Hallam University, 2007. http://shura.shu.ac.uk/19943/.
Full textAbstract:
Today's dynamic marketplace requires flexible manufacturing systems capable of cost-effective high variety - low volume production in frequently changing product demand and mix. Several new paradigms, e.g. holonic, fractal, biological and responsive manufacturing, have recently been proposed and studied in the academic literature. These 'next generation of manufacturing systems' have been especially designed to meet the requirements of an unstable and unpredictable marketplace. However, very little in-depth research of the configuration, planning and control methodologies of these new concepts has been conducted. This research aims to improve the comprehension and implementation of these 21st century manufacturing systems by developing an integrated reference architecture from the combination of their distinctive features that would enable manufacturing enterprises to handle successfully the configuration/reconfiguration, planning and control activities under the conditions of uncertainty and continuous change. In the course of the research, a detailed investigation into the fractal, biological and responsive manufacturing systems is conducted in order to identify the strengths and weaknesses of each concept. The common and distinctive features of the paradigms are then used to merge them to create an integrated reference architecture. The fractal configuration, biological scheduling and 'resource element' representation of resource capabilities and product processing requirements are selected as the major elements of the new system. A detailed study of fractal layout design resulted in seven distinctive methods for structuring and managing fractal cellular systems. A design methodology that supports three types of dynamic scheduling is developed for biological manufacturing systems. Resource elements are used with fractal layouts and biological scheduling to enhance performance and to enable an integration of the concepts. The proposed reference architecture is modelled and evaluated using object-oriented programming, computer simulation and heuristic algorithms. The research results indicate that the performance of systems that employ biological scheduling and fractal layouts can be improved by using the concept of resource elements to utilise any hidden capabilities of resources and to achieve an optimal distribution of resources on the shop floor.
16
Stephenson, Paul. "Estimating, planning and control systems based on production data in the construction industry." Thesis, Sheffield Hallam University, 1988. http://shura.shu.ac.uk/20400/.
Full textAbstract:
The processes of estimating, planning and control within the building industry are seldom fully integrated. This study considers the integration of the processes based on production data collected from several projects. The aim of the research is to investigate the feasibility of the integrated approach as a means of improving the estimating, planning and control processes within the construction industry. Selected cost significant work sections are considered in the study and production data are formulated based on feedback information from several first sample projects. Comparisons are made between average production data and individual project data. A structured systems analysis of the collaborating body identifies existing processes and production orientated information requirements. A model and working system prototype are developed which illustrate integration of the processes and generation of management information. Application of the model as a basis for estimating and planning at various levels of detail is demonstrated. Forecast-observation diagrams provide the necessary control mechanism for monitoring production outputs. Forecasts on a second independent sample of projects are assessed based on tolerances of performances from first sample projects. Accuracy of average forecasts from the model are compared with other data sources, these being estimators' data used in the preparation of the estimate, and bonus surveyors' targets used during the production process. The research concludes that the production data and model give a worthwhile improvement over existing methods in forecasting average productivity performances when methods of placing can be clearly identified and related to work packages. The production data and model are insufficiently accurate to give a worthwhile improvement when measured items cover work packages of varying degrees of complexity, and when proportioning methods are used to obtain production data for different categories of items which collectively represent work packages. Assessment of the model together with refinements are also discussed.
17
Murthy, Nagesh Narasimha. "The manufacturing, marketing, and design interface : implications for manufacturing planning and control in an assemble-to-order environment." Connect to resource, 1997. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=osu1261400836.
Full text
18
Lau, C. C. "Development and assessment of a reactive simulation-based manufacturing planning and control system." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269057.
Full text
19
Stirling, M. D. "Methodologies for the structured development and documentation of manufacturing planning and control systems." Thesis, University of Salford, 2000. http://usir.salford.ac.uk/2042/.
Full textAbstract:
Computerised Manufacturing Planning and Control, (MPC), systems are used by many manufacturing organisations and there has been a significant amount of research into the implementation and use of these systems. It is apparent that these systems, once implemented, require continuous development to meet changing business requirements. What is not well understood is the optimal approach for this development process. This thesis presents the findings of a collaborative industrial research project that addresses this issue. The collaborative partner was Ferodo Ltd., Chapel-en-le-Frith, a leading automotive friction product manufacturer. The project was conducted under the Total Technology scheme. A review of the development of MPC systems is presented. This review considers three approaches to MPC; Manufacturing Resource Planning, (MRPII), Just in Time, (JIT) and Optimised Production Technology, (OPT). It is shown that whilst there is diversity between these approaches and their application in industry, there is convergence between their data structure requirements. The work presented in this thesis is based around the MRPII package used within Ferodo. The research concentrated on defining methodologies for structured systems development, with two main themes:- 1. The development of a multi-stage methodology to assist in the appropriate choice of systems development technique for creation of an effective manufacturing database. 2. Following on from the above, the thesis identifies the need for structured, hierarchical documentation to accompany a manufacturing database. A methodology for creation of this documentation is presented which is based on a pre-defined, top level, template. The methodology uses modelling techniques and defines four levels of documentation to help system developers derive comprehensive documentation from this template. Intranet technology is proposed as a mechanism for providing general access to this documentation. Proposals for further work are presented which include additional testing of the systems development methodology and creation of templates for different industrial scenarios.
20
Lee, Y. "A comparative study of conventional and simulation-based manufacturing planning and control techniques." Thesis, Queen's University Belfast, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402530.
Full text
21
Stallworth, Thomas Earl. "A forward scheduling heuristic for real time control of a flexible manufacturing system." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/24095.
Full text
22
Kleiman, Shanti Lisa. "Ceramic filter manufacturing in Northern Ghana : water storage and quality control." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67230.
Full textAbstract:
Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning; and, (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2011.Page 6 missing. Cataloged from PDF version of thesis.
Includes bibliographical references (p. 68-70).
In 2009, Pure Home Water (PHW), a Ghana based non-profit organization working to provide affordable and safe drinking water to people in the Northern Region of Ghana, began the construction of a ceramic pot filter (CPF) factory near the city of Tamale. By 2011, the factory had the molds, supplies, and kiln necessary for large-scale filter production, but needed to both increase its own water storage capacity, and to implement quality control standards. This thesis documents elements of PHW's efforts to bring household water treatment and safe storage (HWTS) to scale through local manufacturing of ceramic pot filters. Specifically, it records work done between January and April 2011 to build water infrastructure for the PHW factory and to improve quality control for CPF production. Detailed documentation of the design and construction of an underground water storage system, observations about the iterative process of establishing standardized quality control procedures, and recommendations for additional research, are provided to serve as a practical guide for PHW management and others who may engage in similar work in the future.
by Shanti Lisa Kleiman.
M.Eng.
M.C.P.
23
Bielunska-Perlikowski, Krystyna. "Planning, control and management of multicellular manufacturing systems by production authorization cards, PAC, system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ31517.pdf.
Full text
24
Chee, W. Y. "Development of a computerised production planning and control system for a small manufacturing company." Thesis, University of Canterbury. Engineering, 1990. http://hdl.handle.net/10092/6408.
Full textAbstract:
In this project a personal computer-based Oracle software package was used as a development tool for a material requirements planning (MRP) system for a small company. The main objective was to find the right approach and techniques to use in developing such a system.
The system and structured design approaches were followed. The emphasis was on the use of graphic tools for designing. Three diagramming tools were used at the system design stage: decomposition, entity-relationship and data flow diagrams.
A relational database approach was used for data organisation. It was necessary to use the normalisation process to design the tables in the database.
Test runs of the designed system showed that the MRP system was working and with Oracle as the software platform it was flexible to changes.
25
Yeung, Jeff Hoi Yan. "Master production schedule with multiple freeze fences in MRP systems." Thesis, Queensland University of Technology, 1997.
Find full text
26
Smith, Anthony William. "A connectionist network for some elements of real-time planning and control in a manufacturing system." Thesis, Kingston University, 1987. http://eprints.kingston.ac.uk/20762/.
Full textAbstract:
Connectionism is an approach currently being used in the field of cognitive science to investigate intelligence. Connectionist models are based upon the information processing properties of neurons in the brain and consist of very many, simple, interconnected processing elements which operate upon simple signals in parallel. The main objective of the work reported here is to show that connectionism may be applied to areas other than cognitive science. A simulation program has been implemented in which a connectionist network performs the real-time planning and control activities required to supervise the movement and processing of parts in a manufacturing system. The concurrency of connectionism is exploited in such a way that production of a part type may be characterised as “parallel”, where many machine tools are specified to perform each one of the operations required to transform raw material into finished product. The connectionist network is able to control all of these machines simultaneously and in real-time so that many parts can be at any stage of completion in a production facility. The precise routing of a part through the production facility is not specified in advance. Instead, the machine to which a part is scheduled next and the route by which it reaches this machine are decided when the part completes its current operation. These decisions are based upon the availabilities of machines at the time the decisions are made. The connectionist network is able to make these decisions, for every part in the production facility, in negligible time. The benefit of this approach is shown when the breakdown of machines is simulated. The network is able to react autonomously to breakdown by scheduling and routing parts around the affected machine. The necessary computations can be performed in real-time so that breakdown does not cause the manufacturing system to halt while production is re-planned.
27
Agrawal, Rakshita. "Planning and scheduling problems in manufacturing systems with high degree of resource degradation." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34767.
Full textAbstract:
The term resource is used to refer to a machine, tool-group, piece of equipment or personnel. Optimization models for resource maintenance are obtained in conjunction with other production related decisions like production planning, production scheduling, resource allocation and job inspection. Emphasis is laid on integrating the above inter-dependent decisions into a unified optimization framework. This is accomplished for large stationary resources, small non-stationary resources with high breaking rate and for resources that form a part of a network.
Owing to large problem size and high uncertainty, the optimal decisions are determined by formulating and solving the above problems as Markov decision processes (MDPs). Approximate dynamic programming based algorithms are used for solving the large optimization problems at hand. The performance of resulting near optimal policies is compared with that of traditional formulations in all cases. The latter treat the resource maintenance decisions independent of other manufacturing related decisions.
In certain formulations, the resource state is not completely observable. This results in a partially observable MDP (POMDP). An alternative algorithm for the solution of POMDP is developed, where several mixed integer linear programs (MILPs) are solved during each ADP iteration. This helps obtain better quality solutions for the POMDPs with very large or continuous action spaces in an efficient manner.
28
Boughton, Nicholas J. "Modelling manufacturing planning and control systems: the application of object-oriented principles and discrete-event simulation." Thesis, Aston University, 1995. http://publications.aston.ac.uk/15285/.
Full textAbstract:
This thesis argues that the fit between the planning and control system and the manufacturing organisation is a crucial element of success. The design of appropriate control systems is, therefore, important. The different approaches to the design of manufacturing planning and control systems are investigated. It is concluded that there is no provision within these design methodologies to properly assess the impact of a proposed design on the manufacturing facility. Consequently, an understanding of how a new (or modified) planning and control system will perform in the context of the complete manufacturing system is unlikely to be gained until after the system has been implemented and is running. There are many modelling techniques available, however discrete-event simulation is unique in its ability to model the complex dynamics inherent in manufacturing systems, of which the planning and control system is an integral component. The existing application of simulation to manufacturing control system issues is limited: although operational issues are addressed, application to the more fundamental design of control systems is rarely, if at all, considered. The lack of a suitable simulation-based modelling tool does not help matters. The requirements of a simulation tool capable of modelling a host of different planning and control systems is presented. It is argued that only through the application of object-oriented principles can these extensive requirements be achieved. This thesis reports on the development of an extensible class library called WBS/Control, which is based on object-oriented principles and discrete-event simulation. The functionality, both current and future, offered by WBS/Control means that different planning and control systems can be modelled: not only the more standard implementations but also hybrid systems and new designs. The flexibility implicit in the development of WBS/Control supports its application to design and operational issues. WBS/Control wholly integrates with an existing manufacturing simulator to provide a more complete modelling environment.
29
Beedu, Atul. "Integrated inventory control to manage blanket orders in a contract manufacturing environment a case study /." Diss., Online access via UMI:, 2005.
Find full text
30
Mbaya, Martin (Martin Njagi) 1977. "The constraints and limitations of manufacturing resource planning (MRP II) as a tool for shop floor control." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/28226.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.Includes bibliographical references (leaves 63-64).
Manufacturing Resource Planning (MRP II) is a planning system used in various industries to manage manufacturing resources. This study explored the suitability of MRP II in controlling the shop floor by analyzing its constraints and limitations. The study is part of a larger effort by MIT's Production System Design Laboratory to establish an information system that meets the functional requirements of a physical (manufacturing) system. A literature survey of different books and papers on MRP II and Shop Floor Control was conducted and supplemented by interviews with individuals who have worked with MRP II systems. The production System Design Decomposition, a diagnostic tool developed by the Production System Design Laboratory was then used to determine what the constraints and limitations facing MRP II on the shop floor were. A case study at company X, a centrifuge manufacturer which uses MRP II in its production process was then used to tie in the issues raised from the literature survey with a real world example. The results of the literature review and the case study both revealed that MRP II was a poor tool for controlling the shop floor and proposed the use of hybrid systems that combined Kanban control with the strong planning capabilities of MRP II.
by Martin Mbaya.
S.B.
31
Hua, Xia M. Eng Massachusetts Institute of Technology. "Multiple-part-type systems in high volume manufacturing : long-term capacity planning & time-based production control." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/46161.
Full textAbstract:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.Includes bibliographical references (leaf 76).
This project examines a production station that faces fluctuating demand with seasonal pattern. The cumulative capacity exceeds the cumulative demand in a one year period; however, its weekly capacity is not able to meet the weekly demand during the peak season. In addition, a Kanban system has been employed at the station, and the management is concerned about the appropriateness of the Kanban bin levels as well as the efficiency of the resulting production flow. Having characterized the station as a multiple part type system with mixed low and high volume manufacturing, the lead strategy for long-term capacity planning was applied to fulfill excess demand. In the second stage of the project, the Setup-Enhanced Control-Point Policy was adapted to derive an effective scheduling policy, and ultimately the production control parameters were employed to design a suitable Kanban system. With a proper planning technique and Kanban system developed for the station, it achieved a 30% reduction in overall operation cost by avoiding extra workload during peak demand period, and its performance can be greatly improved with effective and automatic production scheduling, as well as better utilization of manufacturing resources at the station level. Key words: Capacity Planning, Control-Point Policy, Kanban Production System Disclaimer: The content of the thesis is modified to protect the real identity of the attachment company. Company name and confidential information are omitted.
by Xia Hua.
M.Eng.
32
McGarrie, Brian. "A framework for the selection and implementation of production planning and control systems for small manufacturing companies." Thesis, Liverpool John Moores University, 1996. http://researchonline.ljmu.ac.uk/5566/.
Full textAbstract:
This study describes the development and application of a framework to aid small manufacturing companies in the selection, improvement and implementation of production planning and control systems. The framework is developed from the existing literature, which indicates an almost total absence of similar frameworks for small manufacturing companies. The literature was categorised in a Supply Chain Management manner to facilitate close relations between companies when undertaking improvements to the production planning and control system. The framework involves an examination of four phases within a company. The first phase, the Current Reality, enables the company under study to undertake an in-depth audit of their existing production planning and control system. The framework provides focus for the small manufacturing company by identifying problems within the existing system. Problem-solving, via education and training, is an integral part of the framework, with phase two facilitating this by organising and planning for change. The third phase of the framework, the implementation provides the company with a choice of pursuing a software solution to the problems identified in the previous phases, or of simpler, incremental improvements in performance. The final phase, the feedback loop to the Current Reality phase enables companies to follow a programme of continuous improvement. A normal change implementation plan lacks the focus that this framework can provide for the selection and implementation of production planning and control systems. The framework has been validated in ten small manufacturing companies in the U.K., and has enabled one company to successfully select and implement a new computerised production planning and control system. The study reports the application of the framework in this company over a three year period. The advantages of using this framework in action research mode are reported. The other nine case studies highlight the ability of the framework to focus on smaller, incremental improvements in production planning and control performance. The empirical research also concludes that a lack of human resources to devote to improvements and implementations, is the main difference between large and small companies when undertaking such exercises. Recommendations for future work on the framework are presented, and the usefulness of the framework for managers in small manufacturing companies, consultants and academic researchers is discussed.
33
Tashtoush, Tariq Husni. "Using lean principles and simulation to enhance the effectiveness of a failure analysis laboratory in a manufacturing environment." Diss., Online access via UMI:, 2009.
Find full textAbstract:
Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Systems Science and Industrial Engineering, 2009.Includes bibliographical references.
34
Boonlertvanich, Karin. "Extended-CONWIP-Kanban System: Control and Performance Analysis." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-04122005-120706/unrestricted/boonlertvanich%5Fkarin%5F200505%5Fphd.pdf.
Full textAbstract:
Thesis (Ph. D.)--Industrial and Systems Engineering, Georgia Institute of Technology, 2005.Griffin, Paul, Committee Member ; Ferguson, Mark, Committee Member ; Billings, Ronald, Committee Member ; Zhou, Chen, Committee Chair ; Reveliotis, Spiridon, Committee Member. Includes bibliographical references.
35
Perdigão, Fabiano Marques. "Proposta de metodologia para analise da gestão de manutenção." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265561.
Full textAbstract:
Orientador: Oswaldo Luis AgostinhoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-08-14T09:48:29Z (GMT). No. of bitstreams: 1 Perdigao_FabianoMarques_M.pdf: 1243627 bytes, checksum: a069968ef5e4e70026b43aa882ecf238 (MD5) Previous issue date: 2009
Resumo: Este estudo procura constatar e analisar os perfis da gestão de manutenção encontrados nas organizações. Por outro lado, verifica quais componentes do fluxo dos processos de manutenção são impactados pela inovação tecnológica, estratégias de negócios e de manufatura. Para alcançar este objetivo foi proposta uma metodologia exploratória com três dimensões S1, S2 e S3, com oito variáveis distribuídas em cinco atributos A1, B2, C3, D4 e E5, que servem para referenciar o posicionamento das organizações com relação ao controle do processo da gestão de manutenção. Aplicou-se a proposta em três empresas através de entrevistas e questionários, sendo uma do setor de serviços, outra do setor de transportes e a terceira de manufatura. Os dados confiados ao autor não são de domínio público. Após a análise dos dados coletados e a simulação, percebeu-se que as capacitações geradas pelo processo de controle da gestão de manutenção formam uma base para tomada de decisões quanto ao posicionamento estratégico, à manufatura e aos negócios. O resultado final da pesquisa indica que os gestores de manutenção demonstraram algumas dificuldades para elaborar um plano de ação para a manutenção, principalmente por se distanciarem dos problemas operacionais. Observou-se que as alterações nos processos de controle da gestão de manutenção estão direcionadas para a adequação de custos, enquanto o desenvolvimento de novos processos de manutenção não possui um processo estruturado, limitando-se à habilidade dos manutentores.
Abstract: This study aims to observe and analyze the maintenance management profiles found in organizations. On the other hand, it verifies which components of the maintenance processes flow are impacted by technological innovation, business strategy and manufacturing. To achieve this goal, a methodology was proposed to explore three dimensions S1, S2 and S3, with eight variables divided into five attributes A1, B2, C3, D4 and E5, used to reference the positioning of organizations regarding the maintenance management process control. The proposal was applied to three companies through interviews and questionnaires. One of them works in the services sector, another in the transport sector, and the third one in manufacturing. The data entrusted to the author are not public domain. After analyzing the collected data and simulation, it was noticed that the skills generated by the maintenance management process control. formed a basis for making decisions about strategic positioning, manufacturing, and businesses. The research's outcome indicates that maintenance managers demonstrated some difficulties in drawing up an action plan for maintenance, especially because of their distance from operational problems. It was observed that changes in control processes of maintenance management are targeted to the costs adaptation, while development of new maintenance procedures do not have a structured process, limited just to the maintainers' skill.
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
36
Fresco, John Anthony. "Automated process modelling and continuous improvement." Thesis, De Montfort University, 2010. http://hdl.handle.net/2086/4572.
Full textAbstract:
This thesis discusses and demonstrates the benefits of simulating and optimising a manufacturing control system in order to improve flow of production material through a system with high variety low volume output requirements. The need for and factors affecting synchronous flow are also discussed along with the consequences of poor flow and various solutions for overcoming it. A study into and comparison of various planning and control methodologies designed to promote flow of material through a manufacturing system was carried out to identify a suitable system to model. The research objectives are; • Identify the best system to model that will promote flow, • Identify the potential failure mechanisms within that system that exist and have not been yet resolved, • Produce a model that can fully resolve or reduce the probability of the identified failure mechanisms having an effect. This research led to an investigation into the main elements of a Drum-Buffer-Rope (DBR) environment in order to generate a comprehensive description of the requirements for DBR implementation and operation and attempt to improve the limitations that have been identified via the research literature. These requirements have been grouped into three areas, i.e.: a. plant layout and kanban controls, b. planning and control, and c. DBR infrastructure. A DBR model was developed combined with Genetic Algorithms with the aim of maximising the throughput level for an individual product mix. The results of the experiments have identified new knowledge on how DBR processes facilitate and impede material flow synchronisation within high variety/low volume manufacturing environments. The research results were limited to the assumptions made and constraints of the model, this research has highlighted that as such a model becomes more complex it also becomes more volatile and more difficult to control, leading to the conclusions that more research is required by extending the complexity of the model by adding more product mix and system variability to compare results with the results of this research. After which it will be expected that the model will be useful to enable a quick system response to large variations in product demand within the mixed model manufacturing industry.
37
Betts, John Maurice 1960. "Just-in-time replenishment and component substitution decisions for assemble-to-order manufacturing when capital is investor-supplied." Monash University, School of Business Systems, 2002. http://arrow.monash.edu.au/hdl/1959.1/9361.
Full text
38
Andersson, Carl. "Designing a lean manufacturing model for Johnson Controls SA." Thesis, Nelson Mandela Metropolitan University, 2006. http://hdl.handle.net/10948/188.
Full textAbstract:
An increase in global competitiveness has forced manufacturing organisations to re – look at their facility from an output and quality standpoint. Leveraging a manufacturing operation into a competitive advantage must at all times support the organisation’s objectives. It is therefore vital that the operation reviews its strategy so that it fulfils the everchanging needs of its market. The main objective of this research was to identify possible approaches that Johnson Controls South Africa (JCI SA) could pursue when implementing a Lean Manufacturing model. In doing this it will improve JCI SA’s manufacturing efficiency and quality, thus giving the organisation a competitive edge over its opposition. The research presented an empirical study of how a Lean Manufacturing model should be implemented in JCI SA. A theoretical and empirical study was conducted on how to successfully implement Lean Manufacturing within an organisation. The main purpose was to establish a theoretical Lean Manufacturing model that the organisation can utilise as a strategic plan to become the global leader in its market place.
39
Rizvi, Syed Zia Abbas. "Production and inventory control of a multi-item multi-stage manufacturing system : simulation modeling, capacitated shipment planning and Kanban design." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55232.
Full textAbstract:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 101).
The project work presented in this thesis has proposed solutions related to the control of production and work-in-process inventory in a multi-item multi-stage manufacturing system. A suitable base-stock inventory control policy is recommended to ensure that the desired service levels are maintained between production stages and for the final customers. Concept of coupling the production lines though coupling-stock under suitable assumptions is then introduced to reduce the stock levels at certain consecutive production stages. A framework for demand seasonality and characteristic analysis is also established to enable the inventory control policy to respond to seasonal variations. Monte Carlo simulation was performed on a model of chain of production stages controlled under base-stock policy for the verification of results and to study the effects of stock-outs on base-stock levels. The results of simulation study showed that overall system performance is satisfactory and desired service levels were achieved. Simulation work was also carried out to validate the line coupling concept and its performance under certain conditions. A novel Kanban based visual management system design, which is aligned with the requirements of inventory control policy, along with the material transfer batch sizes between production stages is proposed to facilitate the implementation of inventory control policy. Furthermore, capacitated shipment planning approach is proposed and implemented in form of a spreadsheet-based interface to aid planning personnel in shipment planning under the constraints provided by the inventory control policy.
by Syed Zia Abbas Rizvi.
M.Eng.
40
Celik, Nurcin. "INTEGRATED DECISION MAKING FOR PLANNING AND CONTROL OF DISTRIBUTED MANUFACTURING ENTERPRISES USING DYNAMIC-DATA-DRIVEN ADAPTIVE MULTI-SCALE SIMULATIONS (DDDAMS)." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195427.
Full textAbstract:
Discrete-event simulation has become one of the most widely used analysis tools for large-scale, complex and dynamic systems such as supply chains as it can take randomness into account and address very detailed models. However, there are major challenges that are faced in simulating such systems, especially when they are used to support short-term decisions (e.g., operational decisions or maintenance and scheduling decisions considered in this research). First, a detailed simulation requires significant amounts of computation time. Second, given the enormous amount of dynamically-changing data that exists in the system, information needs to be updated wisely in the model in order to prevent unnecessary usage of computing and networking resources. Third, there is a lack of methods allowing dynamic data updates during the simulation execution. Overall, in a simulation-based planning and control framework, timely monitoring, analysis, and control is important not to disrupt a dynamically changing system. To meet this temporal requirement and address the above mentioned challenges, a Dynamic-Data-Driven Adaptive Multi-Scale Simulation (DDDAMS) paradigm is proposed to adaptively adjust the fidelity of a simulation model against available computational resources by incorporating dynamic data into the executing model, which then steers the measurement process for selective data update. To the best of our knowledge, the proposed DDDAMS methodology is one of the first efforts to present a coherent integrated decision making framework for timely planning and control of distributed manufacturing enterprises.To this end, comprehensive system architecture and methodologies are first proposed, where the components include 1) real time DDDAM-Simulation, 2) grid computing modules, 3) Web Service communication server, 4) database, 5) various sensors, and 6) real system. Four algorithms are then developed and embedded into a real-time simulator for enabling its DDDAMS capabilities such as abnormality detection, fidelity selection, fidelity assignment, and prediction and task generation. As part of the developed algorithms, improvements are made to the resampling techniques for sequential Bayesian inferencing, and their performance is benchmarked in terms of their resampling qualities and computational efficiencies. Grid computing and Web Services are used for computational resources management and inter-operable communications among distributed software components, respectively. A prototype of proposed DDDAM-Simulation was successfully implemented for preventive maintenance scheduling and part routing scheduling in a semiconductor manufacturing supply chain, where the results look quite promising.
41
Yarkinoglu, Onur. "Computer Aided Manufacturing (cam) Data Generation For Solid Freeform Fabrication." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608834/index.pdf.
Full textAbstract:
Rapid prototyping (RP) is a set of fabrication technologies that are used to produce accurate parts directly from computer aided drawing (CAD) data. These technologies are unique in a way that they use an additive fabrication approach in which a three dimensional (3D) object is directly produced.
In this thesis study, a RP application with a modular architecture is designed and implemented to satisfy the possible requirements of future rapid prototyping studies. After
a functional classification, the developed RP software is divided into View, RP and Slice Modules. In the RP module, the process parameter selection and optimal build orientation
determination steps are carried out. In the Slice Module, slicing and tool path generation steps are performed. View Module is used to visualize the inputs and outputs of the RP
software. To provide 3D visualization support for View Module, a fully independent, open for development, high level 3D modeling environment and graphics library called Graphics
Framework is developed.
The resulting RP application is benchmarked with the RP software packages in the market according to their memory usage and process time. As a result of this benchmark, it
is observed that the developed RP software has presented an equivalent performance with the other commercial RP applications and has proved its success.
42
Picinato, Luis Carlos Molina. "Determinação de curvas caracteristicas de unidades produtivas utilizando simulação de sistemas." [s.n.], 1999. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264318.
Full textAbstract:
Orientador: Oswaldo Luiz AgostinhoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-07-26T00:09:18Z (GMT). No. of bitstreams: 1 Picinato_LuisCarlosMolina_M.pdf: 10983707 bytes, checksum: 744dc466209cb542546002c28c0683b3 (MD5) Previous issue date: 1999
Resumo: Para enfrentar a crescente competitividade, as atuais empresas ainda executam as suas principais funções de gerenciamento utilizando soluções padrões. Isto ocorre principalmente com relação às atividades de Planejamento e Controle da Produção -PCP. Tais soluções normalmente são insensíveis às relações entre parâmetros operacionais do sistema produtivo, e portanto, não oferecem um suporte adequado aos processos decisórios associados ao PCP. Neste contexto, este traballio, propõe a utilização de Curvas Características em sistemas descentralizados de PCP, subdivididos em Unidades Produtivas. Essas curvas descrevem as relações entre níveis de inventário em processo, tempo de fluxo e nível de utilização do sistema. Para determinar essas relações, foi desenvolvida uma metodologia baseada em técnicas de simulação discreta, que é aplicada em Unidades Produtivas, no caso prático estudado. Os resultados mostram que o processo de determinação das curvas utilizando-se técnicas de simulação é viável, assim como a utilização das curvas podem representar uma importante ferramenta para o controle do fluxo produtivo. Foi também demonstrado que as curvas obtidas podem ser ajustadas em um processo contínuo de mellioriada modelagem do sistema produtivo
Abstract: To face increasing competitive pressures, companies still perform their main management functionsmaking use of standard pattem solutions. This occurs mainlywith regard to the activities of Production Planning and Control - PPC. Such solutions are normallyinsensitiveto the relations among operational parameters of the production system, and consequent1y,do not offer suitable support to the decisive process associated to the PPC. In this sense, this work proposes the use of the "Characteristic Curves" in the decentralized PPC systems (subdivided in Production Units). These curves describe the relations between levels of work in process, flow time and leveI of the system utilization. To establish these relations, a methodology was developed based on discrete simulation techniques, which is applied in Production Units, through a practical case study. The results show that the process of determination of the curves by making use of simulation techniques is viable, as well as that the utilization of the curves can represent an important tool to the control of production flow. It is also shown that the obtained curves can be adjusted in a continuous improvement process ofthe production system modeling
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
43
Karlsson, Per-Johan, and Mariana Porto. "Improving the control of work-in-process at VSM Group AB." Thesis, Jönköping University, JTH, Industrial Engineering and Management, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-1302.
Full textAbstract:
Today many companies face problems with inventory management. The importance of adequate inventory management has become more evident, while organizations try to reduce their costs and increase their service level.
This master thesis was conducted at VSM Group AB in Huskvarna, which is a manufacturer that produces and delivers sewing machines to a worldwide market. VSM Group AB has problems with the management and the refilling of the work-in-process (WIP) inventories and also with lack of information about component balance and location in the production and material planning system.
Therefore, the purpose of the thesis was to improve the control of the WIP inventories and the information about the components in the production and material planning system. In order to achieve the purpose, interviews and observations were performed, theories in inventory management were reviewed and the production process was studied.
Afterwards solutions for improvements were proposed. To solve the management and refilling problem, a kanban ordering system was proposed, which would use kanban cards to order components from the storages to the WIP inventories. To develop the component information displayed in the production and material planning system, an additional feature was proposed to the system. So instead of showing one inventory balance for each component, the system would display balances for three different places in the factory: the goods arrival and quality control area, the storage and the production.
The proposed solutions can provide several benefits to the company. The kanban ordering system can increase the material handlers’ efficiency, set a standard refilling quantity and be a tool for reducing the WIP inventory levels. The more detailed information in the production and material planning system can improve the decision making for the purchasers and planners and give the ability to measure the flow and level of material inside the factory.
These solutions will provide a more appropriate inventory management to the company, with better control of the components and improved information quality.
44
Masood, Tariq. "Enhanced integrated modelling approach to reconfiguring manufacturing enterprises." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/6371.
Full text
45
Wu, Zuobao. "Multi-agent workload control and flexible job shop scheduling." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001193.
Full text
46
Chaharsooghi, S. K. "Manufacturing planning and control in small companies : A contribution to the application of 'scientific' methods in small business with the help of microcomputers." Thesis, University of Hull, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382109.
Full text
47
Júnior, Walther Azzolini. "Tendência do processo de evolução dos sistemas de administração da produção." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-21102015-162319/.
Full textAbstract:
A evolução da tecnologia da informação, tanto em hardware quanto em software, na última década, proporcionou ao mundo globalizado mudanças significativas na Gestão das organizações privadas e governamentais, permitindo a integração do fluxo de informações de operação ao fluxo de informações de gestão dos processos de produção, através de uma linguagem de programação específica como o CAD e CAM. Como resultado desse processo de evolução, a partir da década de 90, surgiram os Sistemas Integrados de Gestão (ERP - Enterprise Resource Planning) os quais passaram a incorporar os processos de negócio das empresas induzindo-as a mudanças significativas no ambiente de operação, desde os procedimentos mais simples até os mais complexos. É nesse contexto que pesquisadores e profissionais envolvidos com a implantação de tais sistemas constataram que o custo de aquisição, incluindo investimentos em inovações tecnológicas e treinamento, necessários à operação desses sistemas, por si só não garantiu o custo benefício e o retorno dos investimentos realizados, resultados esses não compatíveis com as expectativas geradas no período de implantação, causando em alguns casos perda de eficiência e frustração por parte dos usuários desses sistemas. Tal evidência induziu o autor do presente trabalho ao objetivo geral de elucidar as causas dos insucessos, partindo para a pesquisa descritiva de diferentes empresas, de segmentos distintos, que implantaram os sistemas ERP de diferentes fornecedores disponíveis no mercado. A pesquisa descritiva de campo permitiu esclarecer no âmbito de operação dessas empresas as suas peculiaridades quanto à estrutura do departamento de planejamento e controle da produção e sua integração com suas técnicas auxiliares. Nesse contexto foi possível avaliar a implantação desses sistemas pelas unidades produtivas pesquisadas que tiveram o objetivo de garantir ganhos significativos quanto à redução do tempo de resposta ao atendimento das necessidades dos clientes, com a possibilidade do apontamento de indicadores de desempenho mais precisos, direcionando a pesquisa para a avaliação do papel do PCP como agente facilitador do processo de implantação e como responsável pela aderência ou não desses sistemas ao sistema produtivo. Logo, um estudo mais aprofundado dos conceitos elucidados na literatura quanto aos tempos de processo e, conseqüentemente, aos tempos de resposta de todo o processo de fabricação, enfatizou a necessidade de se estudar a evolução do processo de manufatura ao longo das últimas décadas. A condução da pesquisa ao estudo das fases inerentes ao processo de evolução da manufatura nas últimas décadas, apontou para a divisão do processo de evolução em quatro fases: 1. Manufatura em Massa; 2. Manufatura Enxuta; 3. Manufatura Ágil; 4. Manufatura Responsiva. Nesse cenário, um dos objetivos específicos do trabalho é o de apontar as deficiências dos sistemas ERP em operação nas empresas que tiveram como meta reduções significativas de tempo de processo, com base no estudo das fases descritas, das técnicas auxiliares do PCP e da relação da função tempo com o contexto atual, além dos sistemas de gestão integrada. A revisão bibliográfica detalhada e cinco estudos de caso aqui apresentados formam o corpo deste trabalho.The evolution of the technology of information, both in hardware and software, during the last decade, have provided to the globalized world significant changes in the Management of private and governmental organizations, allowing the integration of the flow of information of operation with the flow of information of production management processes, by means of specific programming language as CAD and CAM. As a result of this cycle of evolution, which started in the 90\'s, the ERP - Enterprise Resource Planning - was incorporated to the processes of business in companies leading them to significant changes in the operation environment, from the most simple to the most complex procedures. It is in this context that researchers and professionals, involved with the implantation of such systems, had evidenced that the acquisition cost, including investments in technological innovations and training so necessary to the systems operation, did not guarantee the cost benefits and the return of the investments. These results were not compatible with the expectations generated in the implantation period causing, in some cases, loss of efficiency and frustration on the part of the users of these systems. Such evidences lead the author of the present paper to the general objective of elucidating the causes of the failures. The work started from the descriptive research of different companies of distinct segments, which had implanted ERP systems of different available suppliers in the market. The descriptive field research allowed the clarifying of some peculiarities in the scope of operation of the companies as to the structure of their planning department and production control and the integration with supporting techniques. In this context it was possible to evaluate the implantation of these systems, in the considered productive units, which had aimed at guaranteeing significant profits as to the reduction of time of response to customer needs, with the possibility of pointing to more precise performance indicators, thus directing the research to the evaluation of the role of PCP as a facilitator agent in the implantation process and as a responsible one for the observance or not of these systems to the productive scheme. As a result, a broaden study of the concepts, focused on the specific literature, referring to the time of processing and, consequently, to the time of response of all the manufacturing procedures, emphasized the necessity of studying the evolution of the manufacturing process during the last decades. The conduction of the research to the study of inherent phases of the evolution process of manufacturing in the last decades, pointed to the division of the of evolution process in four phases: 1. Mass Manufacturing; 2. Lean Manufacturing (just in time); 3. Agile Manufacturing; 4. Responsive Manufacturing. In this scenario, one of the specific targets of this work is to spot the deficiencies of ERP systems currently in use in the companies which had as a goal significant reductions of processing time, based on the study of the mentioned paradigms, the PCP supporting techniques, and the relation of the function time with the current context, besides the systems of integrated management. The detailed bibliographical revision and five case studies, herein presented, compose the corpus of this work.
48
Boissier, Mathilde. "Coupling structural optimization and trajectory optimization methods in additive manufacturing." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX084.
Full textAbstract:
Cette thèse porte sur l’optimisation des trajectoires de lasage pour la fabrication additive sur lit de poudre, ainsi que leur lien avec la géométrie de la pièce à construire. L’état de l’art est principalement constitué par des trajectoires basées sur des motifs, dont l’impact sur les propriétés mécaniques des objets finaux est quantifié. Cependant, peu d’analyses permettent de relier leur pertinence à la forme de la pièce elle-même. Nous proposons dans ce travail une approche systématique visant à optimiser la trajectoire sans restriction a priori. Le problème d’optimisation consiste à fusionner la structure en évitant de surchauffer (ce qui induirait des contraintes résiduelles) tout en minimisant le temps de fabrication. L’équation d’état est donc l’équation de la chaleur, dont le terme source dépend de la trajectoire. Deux modèles 2-d sont proposés pour contrôler la température : l’un transitoire et le second stationnaire (pas de dépendance en temps). Basés sur des techniques d’optimisation de forme pour le stationnaire et sur des outils de contrôle pour le transitoire, des algorithmes d’optimisation sont développés. Les applications numériques qui en découlent permettent une analyse critique des différents choix effectués. Afin de laisser plus de liberté dans la conception, l’algorithme stationnaire est adapté à la modification du nombre de composantes connexes de la trajectoire lors de l’optimisation. Deux méthodes sont comparées. Dans la première, la puissance de la source est ajoutée aux variables d’optimisation et un algorithme impliquant une relaxation-pénalisation et un contrôle de la variation totale est proposé. Dans la seconde, la notion de dérivation topologique est adaptée à la source. Enfin, dans le cadre stationnaire, nous détaillons le couplage de l’optimisation de la forme de la pièce, pour améliorer ses performances mécaniques, et de la trajectoire de lasage. Ce problème multiphysique ouvre des perspectives d'applications et de généralisations futuresThis work investigates path planning optimization for powder bed fusion additive manufacturing processes, and relates them to the design of the built part. The state of the art mainly studies trajectories based on existing patterns and, besides their mechanical evaluation, their relevance has not been related to the object’s shape. We propose in this work a systematic approach to optimize the path without any a priori restriction. The typical optimization problem is to melt the desired structure, without over-heating (to avoid thermally induced residual stresses) and possibly with a minimal path length. The state equation is the heat equation with a source term depending on the scanning path. Two physical 2-d models are proposed, involving temperature constraint: a transient and a steady state one (in which time dependence is removed). Based on shape optimization for the steady state model and control for the transient model, path optimization algorithms are developed. Numerical results are then performed allowing a critical assessment of the choices we made. To increase the path design freedom, we modify the steady state algorithm to introduce path splits. Two methods are compared. In the first one, the source power is added to the optimization variables and an algorithm mixing relaxation-penalization techniques and the control of the total variation is set. In a second method, notion of topological derivative are applied to the path to cleverly remove and add pieces. eventually, in the steady state, we conduct a concurrent optimization of the part’s shape and of the scanning path. This multiphysics optimization problem raises perspectives gathering direct applications and future generalizations
49
Bergling, Olanders Isabel, and Mikaela Jonasson. "Styrglapp i produktionsföretaget : En fallstudie av Holmen AB." Thesis, Uppsala universitet, Företagsekonomiska institutionen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-156642.
Full textAbstract:
Uppsatsen utgår från resultatet av Holmen AB:s medarbetarenkät Holmen Inblick 2011 i vilken 55 till 65 procent av cheferna uppgav att de känner sig delaktiga i mål, budget respektive verksamhetsplan. Enkätens resultat avviker från ledningens önskade utfall, vilket i uppsatsen omnämns som ett styrglapp.Studiens syfte är att analysera vad som orsakar ett styrglapp genom att klarlägga varför och till vilken grad chefer i Holmen är medvetna om, och kan påverka, mål, budget och verksamhetsplan. Genom att förstå detta kan de åtgärder som krävs för att reducera styrglappet identifieras av koncernledningen. Studien avgränsas till att analysera hur organisationens struktur, kontroll och kommunikation påverkar styrglappet.I studien används en kvalitativ intervjumetod där 17 chefer på två bruk i Holmens koncern har intervjuats individuellt. Därtill intervjuades platschefen för respektive bruk samt Holmens HR-direktör. HR-specialister har även bistått med information.Studien visade att Holmens chefer till låg grad är medvetna om innehållet i mål, budget och verksamhetsplan. Färre har möjlighet att påverka styrverktygen, där påverkan på budget är lägst. Resultatet skiljer sig mellan de två bruken. Medvetenheten och inflytandet är minst bland chefer i produktionen. Den låga delaktigheten beror på brist på formalisering kring hur arbetet med mål, verksamhetsplan och budget ska gå till. Den decentraliserade organisationens maktstruktur försämrar förutsättningarna för koncernledningen att centralt kontrollera utformningen av arbetet med styrmedlen på olika bruk. Avsaknaden av en effektiv kombination av skriftlig, muntlig och elektronisk kommunikation ökar också styrglappet.Till sist, kan enkätfrågans utformning ha haft en betydande inverkan på hur cheferna har svarat, då det saknades en definition av ordet delaktighet. Negativa enkätsvar kan också ha varit ett sätt att uttrycka missnöje över något annat.
50
Branislav, Stevanov. "Razvoj modela planiranja i upravljanja virtuelnim proizvodnim ćelijama." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2014. http://www.cris.uns.ac.rs/record.jsf?recordId=87898&source=NDLTD&language=en.
Full textAbstract:
U doktorskoj disertaciji su predstavljeni modeli za planiranje i upravljanje proizvodnim sistemom organizovanim putem virtuelnih proizvodnih ćelija. U modelima su razvijeni postupci određivanja dužine planskog perioda i broja faza obrade ili montaže. U modelima je razvijen postupak kreiranja virtuelnih proizvodnih ćelija imajući u vidu zahteve planskog i upravljačkog sistema. Modeli omogućuju rekonfiguraciju ćelija usled analize opterećenja tehnoloških sistema i mogućnosti realizacije terminskih planova proizvodnje. Modeli su ispitani na primerima dva proizvodna preduzeća sa teritorije Republike Srbije.Doctoral dissertation presents models for production planning and control ofvirtual manufacturing cells. Models present developed procedure for thedetermination of the production planning period and the number ofprocessing or assembly stages. Models also present the process of creatingvirtual manufacturing cells, bearing the requirements of the productionplanning and control system.The models enable the reconfiguration of cellsdue to the analysis of machines workload and due to the analysis of theproduction schedule. The models were tested on the examples of twoproduction companies from the Republic of Serbia .