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APPROACH TO REDUCING LEAD TIME IN MANUFACTURING SYSTEMS
Hromková, Ivana ; Škopán, Miroslav (referee) ; Šťastný, Jiří (referee) ; Mostýn, Vladimír (referee) ; Knoflíček, Radek (advisor)
Presented PhD thesis aims at development of new methodologies and approaches to reduce lead times in production systems. Therefore the thesis examines in detail the design of new, more comprehensive approaches to shortening lead times. The dissertation describes the methodology of using these approaches in production systems, it is suggested their inclusion in the control structure of production and adequate managerial support for the successful application of these new approaches in the industry is developed. The first part summarizes current knowledge in the field of reducing lead times. The various methods that can be used for reducing lead times are defined and described, from which is selected discrete simulation of manufacturing systems as a suitable method for the purposes of issue development. The next part of this work is therefore devoted to simulation approach to reducing lead times and the factors that affect them, such as processing time, size of the batch, queue lengths, etc. In this part is also discussed the use of information technologies (programming languages, libraries, and software tools) that enable efficient creation of simulation models. The second part is focused on industrial applications implemented to reduce production lead times. Specific simulation analysis deal with, for example, reduction of the lead time for manufacture of surgical instruments, screws, slats, but also transport systems, optimization of production orders input to the production system, the issue of supply, etc. The second part also describes a practical approach to data transfer to / from the simulation model, simulation software connection to the ERP database of enterprise and energy intensity of production. The conclusion summarizes the findings that were detected on the issue of reducing lead times, and within the chosen methodology, simulation of manufacturing processes indicates possible further progress in the research and practical applications.
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Transformation of the simulation model from SW SimPro to SW Plant Simulation
Hloska, Jiří ; Štoček, Jiří (referee) ; Škopán, Miroslav (advisor)
This diploma thesis is based on creation of a simulation model of the conveyor bridge between a paint-shop and an assembly hall in the company Škoda Auto, a.s. in Mladá Boleslav. The model was created in the simulation software Plant Simulation on the grounds of an existing model in simulation software SimPro. Analysis of the existing model in software SimPro as well as a system analysis of conveyors used in the respected production section is carried out in the thesis. Results of simulation experiments accomplished with the newly created model follow. These experiments verify the throughput rate for various production programmes. On the grounds of these results a bottleneck analysis of the conveyor system is carried out and arrangements leading to increase in its throughput rate are made.
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Proposal for Waste Elimanation in the Ferrite Cores Production
Janec, Jiří ; Pavelka, Tomáš (referee) ; Videcká, Zdeňka (advisor)
The topic of this thesis is to optimize the production process of ferrite cores in the company Epcos, Ltd. The work is divided into theoretical, analytical and design part. The first part of the thesis contains theoretical knowledge within the field of lean manufacturing, process mapping and mapping value streams. Based on these findings is determined the theoretical basis for the processing of other parts of the thesis. The aim of the analytical part of the analysis is to map the current state of the manufacturing process, finding bottlenecks, evaluating the results of analysis of the current state, which will be used for the design part of the thesis, to develop proposals for optimizing production bottlenecks and evaluate their contribution.
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Design Laboratory Phase Shifting Transformer
Korejčík, Michal ; Švec, Jan (referee) ; Paar, Martin (advisor)
This thesis deals with a power flow control in the electric power system. An overview of FACTS devices is introduced; their basic characteristics as well as examples of their application are discussed. A significant part of this thesis investigates phase shifting transformers (PST´s), which seem to be suitable for implementation in the transmission system of the Czech Republic. The PST´s are useful devices that control active power flows on cross-border lines and regulate unwanted and unexpected power flows. Basic types and characteristics of the PST´s are discussed. In chapter 7 is designed laboratory task that should validate the regulatory capabilities of the transformer PST. Designs of models of individual parts of this laboratory task are presented. In the last part of this thesis the regulation effect of the PST is validated in the GLF/AES program.
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Analysis and optimization of the production system using computer simulation
Vaďura, Pavel ; Knoflíček, Radek (referee) ; Simeonovová, Ivana (advisor)
This bachelor thesis focuses on the process of the creation of a simulation model followed by dissimulation of this model, and finally optimalization of the system using the results of the simulation. The aim is to clarify basic terms about production with consequential usage of simulation models and their application in the production proces. Next, the creation of the simulation model in the simulation software Factor/AIM is explained and illustratively demonstrated. The first part of the bachelor thesis deals with theoretical information about the production proces, division and creation of the simulation model and it analysis this model with the purpose of finding narrow places and suggesting its optimalization. This simulation proces is simplified version of the manufacture of seamless pipes.
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Implementation of lean management techniques based on the analysis of bottlenecks in selected company
Tůmová, Romana ; Zelená, Veronika (advisor) ; Váchová, Lucie (referee)
The aim of thesis is implemention the chosen techniques of lean management in the company named European Trailer Systems Ltd. based on the identification of bottlenecks. The theoretical part provides basic definitions of bottleneck, Theory of Constraints, Lean management and selected methods of lean management. The practical part begins with the company's European Trailer Systems s.r.o characteristic while describe the current situation. Furthermore, the practical part will focus on the identification of bottlenecks that occur in company European Trailer Systems Ltd. in the production process of sliding roofs, will be followed by a proposal to eliminate found bottlenecks with using methods of lean management and possibly their implementation.
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Management tools utilization for disclosing firm's constraints
Grégr, Jiří ; Chocholatý, Drahomír (advisor) ; Volráb, Ondřej (referee)
This diploma thesis is focused on the use of management tools and practices specialized in finding organizations constraints that limit their performance and make it impossible to effectively achieve their goal. The tools can be divided into static ones that describe relationships between causes and their effects using causal relations and dynamic ones that are oriented on cyclical relations that appear in periods. Although those dynamic tools are not suitable enough for validating causal relations they can better visualize these relations in time. Both of the tools are based on the principle that the user has to change the way of thinking when looking for undesirable effects in the system. The theoretical part of the thesis is extended by Greiner growth model that describes growth phases of organizations and typical problems that appear in each phase. Thus this model can be used to help uncover causes of organizations constraints. Practical part of the thesis is focused on application of the tools and on finding the main constraint in a small software company. It is divided into a few parts: company description, proposal of requirement collection and its implementation, description of relationships between the company and external systems, proposal of an improvement of a notation that is used for diagramming current state of problems in a company, diagramming the current reality tree and finding the main constraint. The contribution of the thesis lies in depicting advantages and disadvantages of the tools used for finding company constraints and in application of one of the tools including the proposal of improvement. The conclusion includes recommendations for improvement implementation that help to eliminate main company constraint and increase the system performance.
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