Relevant bibliographies by topics / Optimalizace účinnosti / Dissertations / Theses
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Dissertations / Theses on the topic 'Optimalizace účinnosti'

Author: Grafiati
Published: 28 June 2021
Last updated: 1 February 2022

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1

Martiš, Jan. "Zvyšování účinnosti a optimalizace výkonových pulzních měničů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-391301.

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This thesis focuses on optimization and increasing the efficiency of high-power DC/DC switching converters with transformer (switching power supplies). The work focuses mainly on using converters with flyback topology for high power, even though it is a common belief that this type of converter is not suitable for high power. This topology was selected because of potentially better achievable parameters, especially the efficiency, in comparison to a commonly used forward converter – in a flyback converter, losses are produced only in one magnetic component (transformer) in contrast to two components (transformer and inductor) in the forward converter. Compared to resonant and quasi-resonant converters, the flyback converter is easily controllable in the whole output voltage and current range. To make the flyback converter favorable for a high-power use, some innovative circuit modifications were made and modern semiconductor and passive components were used. Theoretical part of the work deals with efficiency optimization of the flyback converter, based on analytical solution. Operating parameters of the converter – switching frequency and parameters of the transformer (flux density and numbers of turns) are commonly only guessed or chosen from experience. The objective of this part is a mathematically exact determination of these parameters to achieve lowest total losses of the converter for given input parameters. In a certain case, it was possible to obtain the final solution analytically, in other cases the final solution step had to be done with a help of software. A prototype of a 12-kW switching power supply with a flyback converter was constructed to validate the proposed solutions and methods. The power supply fits into a space of only 33x33x16 cm. Modern semiconductors based on the silicon-carbide (SiC) technology (MOS-FET transistors and diodes) were used. After bringing the converter to a full-power operation, an efficiency of 96.8 % of the DC/DC converter was measured. High efficiency was obtained for a wide range of output parameters. A certain comparison with a forward converter with the same output parameters is done in the work. Not only from an efficiency point of view, the flyback converter seems very perspective.
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2

Kroča, Michal. "Studium účinnosti korozně inhibičních látek ve správkových hmotách a optimalizace jejich dávkování." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227586.

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Corrosion of steel reinforcement in concrete structures poses a risk reduction of durability and ability to perform the required function of structures for which they were designed.The objective of this work was to study the effectiveness of a new type of corrosion inhibitor with different concentrations of the active substance and its comparison with commercial products. The corrosion inhibitors were part of a comprehensive system repair materials from Betosan s.r.o. and using the electrical measurements was studied their effect in reducing corrosion activity caused by aggressive chloride environments.
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3

Muczka, Vojtěch. "Zvýšení účinnosti jednofázového asynchronního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377331.

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This thesis is dedicated to efficiency increase of one phase induction machine through material change of induction cage and rotor slot shape optimization under the condition of maintaining the same locked-rotor torque. In the first part of this thesis is the explanation of induction machine principles. Next is the comparison of measured and simulated parameters of small one phase machine from ATAS company. The following part is dedicated to the analysis of rotor slot shape and ring size influence on machine parameters when using pure aluminum instead of resistive alloy. The next chapter deals with slot shape optimization in the program RMxprt, controlled by genetic algorithm written in MATLAB interface. In the final part are the resultant slot shapes simulated in Ansys Maxwell using finite element method and then the measured, simulated and expected parameters are compared.
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4

Jedlička, Lukáš. "Optimalizace malého asynchronního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-401965.

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The goal of this thesis is to improve efficiency of an induction motor. In the first part, the working principle is described. The next part deals with the origin of losses and possible solutions to decreasing losses without impacting the production possibles. The third part of the thesis is focused on the calculation of parameters of a small serial production motor. In the fourth part, these parameters are verified using the analytical tool RMxprt which is included in Ansys Maxwell. The fifth chapter deals with the optimization using Matlab genetic algorithm. In the final chapter, the design modifications are verified using the method of finite element Ansys Maxwell 2D.
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5

Hanzlíček, Martin. "Simulace řízení asynchronního motoru s ohledem na vysokou účinnost." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442789.

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The diploma thesis deals with the simulation of induction motor control with respect to high efficiency. The theory of an induction motor is described here, with emphasis on its losses. Scalar and vector control are also described here. Vector control is optimized for higher efficiency. Subsequently, the creation of a model in the program đť‘€đť´đť‘‡ đťżđť´đťµâ’𝑆𝑖𝑚𝑢𝑙𝑖𝑛𝑠is described here, for the comparison of scalar and vector control with optimization.
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6

Martinásková, Magdalena. "Porovnání účinnosti návrhů experimentů pro statistickou analýzu úloh s náhodnými vstupy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226781.

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The thesis presents methods and criteria for creation and optimization of design of computer experiments. Using the core of a program Freet the optimized designs were created by combination of these methods and criteria. Then, the suitability of the designs for statistical analysis of the tasks vith input random variables was assessed by comparison of the obtained results of six selected functions and the exact (analytically obtained) solutions. Basic theory, definitions of the evaluated functions, description of the setting of optimization and the discussion of the obtained results, including recommendations related to identified weaknesses of certain designs, are presented. The thesis also contains a description of an application that was created to display the results.
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7

Kurfűrst, Jiří. "Optimalizace stroje s permanentními magnety na rotoru pomocí umělé inteligence." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-233585.

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The dissertation thesis deal with the design and the optimization of the permanent magnet synchronous machine (SMPM) based on the artificial intelligence. The main target is to apply potential optimization methods on the design procedure of the machine and evaluate the effectiveness of optimization and the optimization usefulness. In general, the optimization of the material properties (NdFeB or SmCo), the efficiency maximization with given nominal input parameters, the cogging torque elimination are proposed. Moreover, the magnet shape optimization, shape of the air gap and the shape of slots were also performed. The well known Genetic algorithm and Self-Organizing migrating algorithm produced in Czech were presented and applied on the particular optimization issues. The basic principles (iterations) and definitions (penalty function and cost function) of proposed algorithms are demonstrated on the examples. The results of the vibration generator optimization (VG) with given power 7mW (0.1g acceleration) and the results of the SMPM 1,1kW (6 krpm) optimization are practically evaluated in the collaboration with industry. Proposed methods are useful for the optimization of PM machines and they are further theoretically applied on the low speed machine (10 krpm) optimization and high speed machine (120 krpm) optimization.
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8

Kreysa, Karel. "Polohové řízení solárního panelu s optimalizací energetické účinnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219159.

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This thesis is focused on design and prototyping of solar panel position control system for an obtaining of the maxima renewable energy from sun. In this thesis, various ways of solar panel positioning are considered and analyzed. Consequently, a construction arrangement of the positioner is presented. It is mechanically adapted to obtain the maximum efficiency in typical environment corresponding with the Central European geographical latitude. Different methods of sun monitoring are considered and analyzed. On the basis of this analysis, a proper prototype of sun monitor for exact positioning with disturbance filtering has been constructed. Following part of work is devoted to stable, fully automated, control subsystem for reliable functionality of solar system. A suitable microprocessor with a robust firmware has been implemented to this control unit. Finally, system parameters measurement and closing analysis of gained renewable energy and backflow computation is presented in the end of this diploma thesis.
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9

Jirků, Filip. "Optimalizace nátoku na vodní kolo a jeho vliv na účinnost." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444635.

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10

Stuchlý, Karel. "Vliv rotoru na účinnost malého asynchronního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377095.

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The aim of this master thesis is optimization of the rotor in the terms of efficiency. An analysis of the effects of rotor parameters is performed by RMXPRT. A genetic algorithm is created to find the optimal solution. Solutions are evaluated and adjusted according to the results. Measurements on the actual machine are performed and evaluated to verify the functionality of the simulation models.
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11

Šporcr, Viktor. "Optimalizace konstrukce elektrických strojů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242171.

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Semester theses focus on optimisation methods useful for construction electric machines. Contain elementary sorting optimization methods and brief description of their algorithms. In these theses is foreshadow how shape of asynchronous stator core should be optimized for better effectivity. Next chaps are discuss about application optimization methods to concrete induction motor.
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12

Ondra, Michal. "Optimalizace regulace plevelů v košťálové zelenině." Master's thesis, Česká zemědělská univerzita v Praze, 2016. http://www.nusl.cz/ntk/nusl-256972.

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Small plot field experiment carried out in 2015 on Demonstration and experimental field of Czech University of Life Science in Prague. Objective of the experiment was get new knowledge of efficiency and selectivity of selected herbicides in kohlrabi. Main objective of the experiment was described of influence of irrigation and use of adjuvant on efficiency and selectivity of herbicides. The kohlrabi was growed from transplant. Herbicides were applicated five days after transplanting. Herbicides were applicated in few variant: separately, with adjuvant, two level of irrigation (basic irrigation 15 mm / intensive irrigation 65 mm). During growing season rained 70 mm. Efficiency and selectivity of herbicides was assessed by estimation method using a percentage scale from 0 to 100 %. Efficiency of herbicides was assessed on weeds: Thlaspi arvense, Chenopodium album and Solanum nigrum. Next objectives were: yield of above ground biomass and market tubers, weight of roots, contain of vitamin C, glucosinolates and herbicide residues in tuber. Efficiency of herbicide Stomp 400 SC was significantly higher than efficacy of Butisan 400 SC on Thlaspi arvense and Chenopodium album. Intensive irrigation caused higher efficiency. On the other side tank mix of herbicides and combination herbicides with adjuvant caused insignificantly higher efficiency. Butisan 400 SC had the highest effectivity on Solanum nigrum compared to efficacy of herbicide, Stomp 400, but efficiency efficacy of herbicide Stomp 400 SC was sufficient. Stomp 400 SC demaged kohlrabi more than Butisan 400 SC, especially on plots with intensive irrigation. Herbicide Stomp 400 SC had negative influence on roots. On plots treated by herbicide Stomp 400 SC was showed lower weight of roots about 56 % compared to hand-weeding plots. Kohlrabi on plots treated Stomp 400 SC with intensive irrigation produced not market weight of tuber (less than 200 g/plant) in harvest time. From these reason, the harvest time must have been put off one week. Residues of metazachlor (Butisan 400 SC) were not detected in tuber. Residue of pendimethalin (Stomp 400 SC) was found on every plots treated by herbicide Stomp 400 SC. Found concentration of pendimethalin was not higher than maximal residue limit (0,05 mg/kg). The highest concentration of vitamin C and glucosinolates was found in tuber damaged by tank mix combination of Butisan 400 SC + Stomp 400 SC. On the other side the lowest concentration of vitamin C and glucosinolates was found in tuber from hand weeding plots, but differences among treatments were not significantly.
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13

Šišák, David. "Optimalizace tvaru drážek asynchronního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318185.

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This master thesis deals with optimization of the shape of the stator and rotor slots of induction motor with focusing on increasing efficiency. The theoretical part introduces the principles of optimization algorithms. Another part is devoted to design the shape of slots and its influence on the shape of slots on machine. On the models of motor was conducted the optimized shape of slots by using a genetic algorithm. Firstly, it was performed by using the analytical calculation in the RMxprt program, then by using the finite element method on two different models, whose difference simulates the influence of the production technology on the efficiency of the motor. Laboratory measurement was made on a real machine as well. The results of the measurement, calculations and optimizations are compared in the work.
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14

Binek, Martin. "Optimalizace magnetického obvodu klasického asynchronního motoru při napájecí frekvenci do 210 Hz." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399567.

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This master’s thesis first deals with the theory concerning induction motor. It briefly desbribes the construction of three-phase induction motors, the generation of tractive force, power flow with loss distribution and also torque characteristic. In the next part an analytical calculation of the parameters of equivalent circuit for an existing induction motor with known dimensions is performed. After the calculation it is possible to find out the rated parameters of the motor, which makes it possible to further compare results with the values obtained by other methods. The next step was to create a model of the motor in RMxprt program, which is later also translated to ANSYS Maxwell 2D model. Simulations were carried out in both interfaces. As the next step the results obtained by the three methods are compared with measured values and also evaluated. The final part of the thesis focuses on the optimization of the magnetic circuit for higher frequencies. Efficiency of the modified induction motor is examined for higher frequencies using RMxprt Optimetrics and this procedure is performed for both default and alternative electrical steel materials.
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15

Machát, Ondřej. "Výpočtový systém pro vyhodnocení výrobních ukazatelů spaloven komunálních odpadů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230598.

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This thesis contains evaluation of crucial operational indicators of a waste-to-energy plant. Above all, it is lower heating value of municipal solid waste and boiler efficiency. An approach for evaluation improvement by mathematical methods is proposed. The approach is implemented in a computational tool developed in Microsoft Excel. The approach is tested and subsequently used for operational data from a real waste-to-energy plant.
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16

Kovář, Radim. "Uzavřený oběh plynové turbiny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227952.

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Diploma thesis deals with the gas turbine closed cycle. The first part concerns the maximum of theoretical efficiency and practical excutable efficiency for the cycles without regeneration, cycles with regeneration and cycles with regeneration with split compression. The second part concerns the optimalization of the recuperator towards the speed of gas flow in the pipes of the recuperator. The third part includes weight and size design of two kinds of recuperators for different levels of regeneration.
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17

Koval, Filip. "Efektivnost provozu fotovoltaických generátorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217629.

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Objective of master’s thesis theoretical part is especially to illustrate influence of operation conditions, such as solar radiation, temperature or pollution of photovoltaic generator active area, on load and power characteristics of photovoltaic generator, or more precisely on photovoltaic conversion efficiency. Possible variants of increasing effectivity of using photovoltaic generator are explored, such as solar radiation concentration, photovoltaic generator active area cooling or aplication of optimalization circuit. Pivotal part of master‘s thesis is focused on experimental device practical realisation, concretely type MSQ36-10 photovoltaic generator with oriented concentrators of solar radiation. Practical realisation includes design of master‘s thesis experimental part construction with subsequent design of photovoltaic generator motion cycle necessary for adequate simulation of configuration variants solved using single testing photovoltaic generator. Description of own experimental device construction with list of measuring places used in task takes up. It is used automatic monitoring system working as independent measurement task for required values measuring and consecutive data collecting. It is done in two phases. First phase is measurement of all required values, in second phase measurement with attached optimalization circuit is made. Optimalization circuit sets best working point of photovoltaic generator according to actual working conditions. Master‘s thesis intention is experimental verification of solar radiation concentrators application convenience, orientation of photovoltaic generator or its mutual combination, namely using type MSQ36-10 photovoltaic generator. Objective is evaluation of reached energetic gain for all experimental device layouts in variable operating conditions.
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18

Strachala, Dávid. "Modifikace struktury křemíkových solárních článků." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221019.

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The aim of the work is to create a coherent overview of the silicon monocrystaline solar cell in terms of the physical principle of the structure and sequence of technological operations necessary for its production. The effect of individual manufacturing steps is discussed in relation to the requirement of decreasing recombination, optical and ohmic losses of the monocrystalline solar cell. Due to a theoretical assumption, one-dimensional model of solar cell was created in a PC1D software that was later optimized to achieve the highest possible efficiency. Using the available technologies, final model of the solar cell is manufactured in Solartec company and in the end of the work compared with the output of simulation.
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19

Jágrová, Petra. "Hodnocení účinnosti propagace s cílem optimalizace nakládání s odpady." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-166593.

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20

Filarová, Zuzana. "Kvantitativní stanovení buněčné proliferace (optimalizace metod, hodnocení účinnosti modelových látek)." Master's thesis, 2006. http://www.nusl.cz/ntk/nusl-272204.

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21

Lunerová, Marie. "Optimalizace dávek herbicidů s využitím metod založených na měření fluorescence chlorofylu." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-90217.

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22

Vondra, Michal. "Využití moderních metod k optimalizaci dávek herbicidů a snížení jejich dopadů na životní prostředí." Doctoral thesis, 2009. http://www.nusl.cz/ntk/nusl-93678.

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23

ČERNÁ, Kristýna. "Optimalizace měření HPGe detektorem s velmi nízkým pozadím pro dosažení nízkých hodnot MDA." Master's thesis, 2008. http://www.nusl.cz/ntk/nusl-49427.

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Abstract My thesis examines the measurement optimalization when the semiconductor HPGe detectors with a low background and a high relative efficiency are used for achieving low values of MDA (minimum detectable activity). I conducted my research in the Department of Spectrometry of SÚRO (National Radiation Protection Institute) in Prague. In this laboratory the standard geometries of detectors with lower efficiency are used. The aim of this thesis is to offer a proposal of new geometry, sizes and shapes of measurement cells which will better correspond with the demand for higher efficiency of updated detectors. The assignment was to find the best mathematical function to descibe the correlation between efficiency and the direction of the radiation point source towards the detector. This function is derived from experimentally obtained data. To conduct measurements, three kinds of detectors with high relative efficiency used for activity measurements at different geometries were selected. As the source of gamma radiation, the point sources with energies of 46 keV, 661 keV, 1332 keV in different distances and positions were used. The function was applied separatelly to each of the three detectors and to the areas above the detector and sidewards of the detector. The objective of the research was to project new measurement geometries or to optimalize the current ones which could be used also in other detectors with high efficiency. After integrating the function in the cylindrical area above the detector and the annular area sidewards of the detector, areas contributing substantially to the overall efficiency were determined. These areas may be considered to be the optimal sizes for new geometries in given positions. After combining all the optimal areas above the detector, sidewards of the detector and for selected energies and the detector, optimal sizes of a new geometry were found. The function can be used both in the front part and the side part of the detector but its validity is limited. The value of MDA for the particular geometry is in indirect proportion to the efficiency square root and thus this new geometry should lead to minimum values of MDA.
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