|
| |
|
|
On the optimization of a production line in a mass production
Lyčka, Aleš ; Venclík, Milan (referee) ; Píška, Miroslav (advisor)
This diploma project deals with the production line in the selected company. The theoretical part is dealing with lean production, followed by the company description and description of the production line itself. The diploma project looks at the production line from a variety of perspectives and looks for the most appropriate points to optimize. The most important aspects are the efficiency of production and ergonomics. After finding critical points, different solutions are proposed and they are further elaborated, evaluated and the most appropriate one is recommended.
|
|
|
Algorithms for forward and backward planning
Sluka, Filip ; Hromková, Ivana (referee) ; Simeonov, Simeon (advisor)
The thesis deals with production planning. It contains theoretical description of methods used for production planning and optimizing. Thesis describes bottleneck problems in production. It offers overview of ways to identify and analyze bottleneck influence to manufacturing process efficiency. Thesis proposes ways to eliminate bottlenecks using various algorithm types. It applies theoretical knowledges from optimization and graph theory to program creation that is focused on order delay and readjustment time minimizing. The program implements genetic algorithm.
|
|
|
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.
|
|
|
The Design Study to Improve Production Process
Plocek, Jan ; Rosenberg, Pavel (referee) ; Jurová, Marie (advisor)
This bachelor thesis deals with the analysis of manufacturing processes including finding the bottleneck in a production. In this bachelor are described methods and technologies that the company uses in production. Based on the analysis, will be designed a concept of elimination the bottleneck and to improve the manufacturing process.
|
|
|
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.
|
|
|
Rationalization of the production line
Straka, Jiří ; Štipčák, Jaroslav (referee) ; Osička, Karel (advisor)
This masters thesis optimises production of the step plates (which are parts of the sliding steps systems used in tramways, subways, hi-speed trains etc.) to increase the production rate to meet customers demand. The purpose of the work was reached by detailed analysis of the production process followed by evaluation of the results which led to the list of the possible solutions. The solution with the greatest time improvement was chosen and explained in detail.
|
|
|
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.
|
|
|
Phylogeography and conservation genetics of rare palearctic megaherbivores
Červeňák, Jakub ; Hulva, Pavel (advisor) ; Robovský, Jan (referee)
This review is focused on the surviving species of Pleistocene megaherbivores in the Palearctic realm. It describes a basic classification of herbivores depending on their trophic niche, the adaptations associated with diet and an application of Cope's rule in evolution of ungulates. This is followed by a description of different approaches in defining megafauna and causes of large animals extinctions at the end of the Pleistocene and during the Holocene. At the end of the general part of this work, the importance of megafaunal elements as keystone species and concepts of downsizing, associated trophic downgrading and the idea of rewilding are being emphasized. In the second part of the work, Pleistocene history, phylogeography and marked reduction of range during the Holocene are described for elk (Alces alces), European bison (Bison bonasus) and Przewalski's horse (Equus przewalskii) according to the available literature. Finally, a history of the efforts to save the species and current knowledge on conservation genetics related to an overcome bottleneck effect are ascertained. Key words: Pleistocene megafauna, bottleneck, reintroduction, rewilding, browsing, grazing
|
|
|
A traffic flow with a bottelneck
Kovařík, Adam ; Janovský, Vladimír (advisor) ; Vejchodský, Tomáš (referee)
Title: A traffic flow with a bottelneck Author: Adam Kovařík Department: Department of Numerical Mathematics Supervisor: prof. RNDr. Vladimír Janovský, DrSc. Supervisor's e-mail address: janovsky@karlin.mff.cuni.cz Abstract: In this paper we study a microscopic follow-the-leader traffic model on a circu- lar road with a bottleneck. We assume that all drivers are identical and overtaking is not permitted. We sketch a small part of the rich dynamics of the model including Hopf and Neimark-Sacker bifurcations. We introduce so called POM and quasi-POM solutions and an algorithm how to search them. The main goal of this work is to investigate how the optimal velocity model with a bottleneck deals with so called aggressive behavior of dri- vers. The effect of variable reaction time and a combination of both named factors is also tested. Using numerical simulations we'll find out that aggressiveness and faster reactions have positive effect on traffic flow. In the end we discuss models with two bottlenecks and with one extraordinary driver. Keywords: dynamical systems, ODEs, traffic flow, bottleneck, aggressiveness. 1
|
guest ::
