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Rationalization of a manufacturing system at Prodia company
Jakubec, Jan ; Navrátil, Petr (referee) ; Kubík, Roman (advisor)
The work deals with the optimization of the production system in the engineering company Prodia s.r.o. There is a review of technological design in the introduction, the methods of analysis, design methods and capacity calculations are introduced. Subsequently, using these methods, the current state of material flows are analysed, the critical points in the production defined and design of new solution options to eliminate the main weaknesses identified during the analysis. Finally, an evaluation of the best variant and its economic profitability is introduced.
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Rational process for the testing of powered door operation for rail vehicles
Grulichová, Jana ; Navrátil, Petr (referee) ; Kubík, Roman (advisor)
This master´s thesis focuses on possible rationalization of the testing operations the door drive units of the rail vehicles. The aim is to propose solutions to increase productivity and reduce operating costs. The first section briefly describes the history and basic principles of lean manufacturing. The following is the description of the assembly and testing of the door drive units including the analysis of the current state of testing workplaces. The following section identifies critical areas and reserves that could be used to increase productivity. In next chapters are proposed kinds of rationalization, their evaluations according to the cost of implementation and the possible achieved effects. Chosen variant is elaborated in more details. The last part deals with the economic evaluation and verification of the proposed method in conditions of the real production.
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Optimization of work area at the end of production line where final control checks of cook-stove are conducted
Nábělková, Irena ; Navrátil, Petr (referee) ; Kubík, Roman (advisor)
The subject of this thesis is focused on analysis of three test workplaces for final inspetion of a stove and determination of a workplace most appropriate for optimization. The thesis includes operating instructions of test equipment and test regulations of appliances that are tested on the production line. The analysis of the operation times was based on data measured in the MORA company and led to an idea of reducing the number of electric stoves positions and guaranteeing the same reliability of testing. The re-measurement of data and the comparison of results has been carried out.
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Cleaning of biogas by the PSA (pressure swing adsorption)
Navrátil, Petr ; Houdková, Lucie (referee) ; Leštinský, Pavel (advisor)
The topic of this master thesis is upgrading of biogas. As a mixture of gases produced during anaerobic digestion, contains methane which is highly energy valuable gas. But also other substances that we want to remove. We will present the motivation for upgrading biogas and the possibility of separation, generally the pressure swing adsorption method. The key parameter of this technique is the choice of a suitable adsorbent. This is possible based on the knowledge of adsorption processes, therefore, is also described below. The objective of this thesis is to determine the parameters of the pressure swing adsorption metod. To do this it is necessary to determine the adsorption capacity of the adsorbent, measure breakthrough curves of carbon dioxide and methane, and determine the pressure drop of solid bed, etc. As a result we can finally make a balance and evaluate the applicability in practice.
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Stress - strain analysis of bridge structure during the train passage
Kolárik, Matej ; Navrátil, Petr (referee) ; Skalka, Petr (advisor)
The bachelor’s thesis concerns the stress-strain determination of the rail bridge in Komárov during the train crossing. The task was solved in the program ANSYS which uses the finite element analysis. The following factors were taken into consideration: a non-loaded state, the state of a train assembly load, and detailed observation of a continual crossing of diesel train. Following the series of results the most dangerous state was defined and the safety calculated.
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Three-point bending test of foam laminates
Kelecsényi, Matej ; Navrátil, Petr (referee) ; Skalka, Petr (advisor)
The bachelor thesis deals with the formation and the spread of disorder of crossbeams in core of composite, in ceramic foam with homogeneous structure formed by Kelvin cells with open porosity loaded by three-point bending test. The method of finite element in software ANSYS was used for the creation of composite sample calculation model as well as in calculation of sample loads. The results of the thesis are the values of the sample reaction force and of the first main tension on crossbeams of foam core sample obtained by loading of the foam composite sample. The area of breaches crossbeams was inferred from the analysis of composite core structure breach. In conclusion were evaluated the results obtained in this thesis.
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LTE system models
Navrátil, Petr ; Masopust, Jiří (referee) ; Hanus, Stanislav (advisor)
Master’s thesis is focused on part of mobile network named LTE. Project is analyzes the LTE physical layer, which is divided into four basic parts: Physical channels and modulation, Multiplexing and channel coding, Physical layer procedures, Physical layer measurements. Every part is described by actual 3GPP standard [1]. To understand the problem is expected a reader basic knowledge of OFDM systems, which the LTE system uses. The next part of this master’s thesis is dedicated to mathematic model physical layer of system LTE, created by program Matlab. This model is designed to measure errors in data transmission.
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Study of Pipe Drain Construction
Navrátil, Petr ; Bernatík, Radek (referee) ; Svoboda, Richard (advisor)
Mixing of backfill of the pipe drain construction with sub-ballast layer material through using enclosed drainage systems (mostly by pipe drains) has to be prevented. In order to do so, regulation SŽDC S4 Železniční spodek provides a filtration criterion which needs to be fulfilled or a geotextile with filtration function has to be used. This master thesis verifies if filtration criteria are fulfilled in between different backfilling of the pipe drains and sub-ballast layers in compliance with TNŽ 73 6949. Furthermore a verification of filtration function of different geotextiles including propositions of their suitable placement within construction of the pipe drain system is included.
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Optimalization of the flow of material in a pressing line at Siemens Electric Machines company
Hruška, Jindřich ; Navrátil, Petr (referee) ; Kubík, Roman (advisor)
This thesis deals the optimalization flow of material in the press lines in company Siemens Electric Machines s.r.o. The thesis begins with theory of the flow of material and the Kanban method. After that thesis describe the issues which the company contend. In the next chapters the thesis The work contains general requirements for the assignment and optimization required by management and proposed possible solutions for optimizing material flow in the company. In the following chapters thesis solve the realisation of the chosen variant, for which Siemens Electric Machines to decided and the costs associated with implementation.
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