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1
Nykodým, Jiří. "Vliv provozních parametrů spalování a konstrukčních parametrů nízkoemisního hořáku na charakteristické parametry spalovacích procesů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232142.
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The main aim of the work was the investigation of the effect of operational parameters of the combustion process (combustion air excess, primary fuel ratio) and burner constructional parameters (the pitch angle of secondary nozzles, tangential orientation of secondary nozzles towards the axis of the burner) on the formation of NOx and CO, flue gas temperature, the shape, dimensions and stability of the flame, in-flame temperatures in the horizontal symmetry plane of the combustion chamber and the amount of heat extracted from the hot combustion gases in the combustion chamber’s shell. Experimental activities were carried out in the laboratory of the Institute of Process and Environmental Engineering, which is focused on burners testing. The combustion tests were performed with the experimental low-NOx type burner, namely the two-gas-staged burner. Mathematical model developed based on the experimental data describes the dependency of NOx on the operating parameters of the combustion process and burner constructional parameters. The model shows that increasing air excess and increasing angle of tangential orientation of the secondary nozzles reduce the formation of NOx. The temperature peaks in the horizontal symmetry plane of the combustion chamber decreases with increasing combustion air excess. The thermal load to the combustion chamber’s wall along the length of the flame was evaluated for selected settings. It was validated that the thermal efficiency of is reduced when higher air excess is used.
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Skryja, Pavel. "Vliv konstrukčních parametrů návrhu procesního hořáku na stabilitu a parametry spalovaní." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-316143.
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The objectives of this paper focus upon composing recommendations with respect to burners design while observing aerodynamic, together with present and advanced developments in the field of flame technology principles. Specifically the aims are set at flame stability and pollutions. Important part of this paper is a novel design procedure dealing with premixed burners. Further, by exploiting the results of testing program enabled one to design burners exhibiting low level of nitrogen oxides emissions. On the basis of aerodynamic analysis of premixed burners flow path several recommendations on the geometry resulted in proposing two ejectors, which transport the combustion air. In the first ejector the fuel jet, generated by flow through a nozzle, draws the specified part of the combustion air, and then the mixture is a driving agent of the second ejector. The remaining part of combustion air flows first through the radial curved vanes, and second its tangential velocity component is augmented by axial vanes prior it enters mixing part of the second ejector. For the additional contribution to the rotating motion the inclined axial vanes built inside the nozzle of the second ejector are responsible. The resulting swirling number reaches the values up to 2.6. For the burner so arranged fire stability and low NOx emissions in the wide operating conditions can be expected. Within the frame of extensive testing program in the field of diffusion burners several modifications have been carried out such as setting of axial vanes which secure the swirling motion, changes of combustion air flows path, and modifications of secondary nozzles, these resulted in extending zone of stabilized flame and reducing the formation of NOx, e.g. NOx emissions of 70 ppm, prior the modifications, have dropped to 30 ppm (dry flue gas 3% O2). The main contribution of this paper stands in applications of development activities results in aerodynamic and flame within their implementation in the field of burners design. Further, it is the proposed design of burners which are capable of simultaneously firing products of the biomass microwave pyrolysis, namely syngas and bio-oils.
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Paščinský, Jiří. "Vliv parametrů vytvrzování na vlastnosti elektroizolačních laků." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219047.
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The bachelor thesis submitted deals with properties of electro-insulating lacquer hardenable by ultraviolent radiation and temperature. Within the theoretical part a summary of electro-insulating lacquers used in electrotechnics has been elaborated. Chemical changes that take place in this material group have been described during hardening process. A method of dielectric relaxation spectroscopy specifically focused on mathematic and physical description of polarisation and conductive mechanisms taking place in the structure of the given material has been closely studied. In the experimental part a workplace for hardening and long-term exposition of lacquered samples during simultaneous effect of various climatic elements has been designed and built. The selected electric and mechanical properties have been monitored on three sets of experimental samples prepared by means of different methodical procedures. The results gained have been mathematically evaluated and physically interpreted in term of methodical procedure of hardening and different temperature of measurement.
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Vavrečka, Lukáš. "VLIV PARAMETRŮ VYSOKOTLAKÉHO OSTŘIKU NA KVALITU ODOKUJENÍ." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-233948.
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This work is focussed on hydraulic descaling of hot surfaces. Hydraulic descaling is a process when layers of oxides are removed from hot steel surfaces during continuous rolling. High pressure water beam is used. Quality of descaled surfaces is important for final quality of rolled product. Insufficient descaling causes drop of final quality, degradation of rolls and lost of yields. High-pressure water beam has two effects on a scale layer. The first effect is mechanical caused by impact pressure. The second one is a relatively intensive thermal shock depending on a set of parameters (water pressure, nozzle type, distance from the surface, inclination angle, speed of product moving). There are a lot of theories about principles of scales removing. Main task of this work is to make it clear which theory is acceptable and which is just ,,theory”. For this purpose mathematical modelling and experimental work were used. In experimental part, three types of experimental measurement were done. First one, measurement of dynamical effect of water beam – impact pressure. Second one, measurement of temperature drop when a product is passing under the nozzle. Measured data (temperatures) from this measurement are evaluated with inverse task and heat transfer coefficient is obtained. And the third experimental measurement is simulation of whole process of descaling. Quality of descaled surfaces is valuated according to amount of remained oxide scales. Data from firs and second experimental measurement are used as boundary conditions for mathematical modelling. For mathematical simulations, FEM (finite element method) system ANSYS was used. Obtained data from experimental measurement were applied on 2D and 3D models of basic steel material with layer of scale. Influence of theses data on final temperature, stress and strain fields were observed.
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Hejtmánek, Petr. "Vliv aerodynamických parametrů na jízdní vlastnosti vozidel." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-234180.
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The main aim of this dissertation was to develop a computational tool capable of evaluating the influence of aerodynamics on the handling of a vehicle. The methodology it uses is based on the simulation of driving manoeuvres with a single-track model of a vehicle, which was composed with an emphasis on minimizing the amount of necessary input parameters. This simple model, which allows the assessment of the influence of aerodynamics on vehicle dynamic and static driveability, therefore doesn’t require large amount of input data, which makes the acquirement of relevant values easier. The computational model was validated by extensive measurements of two driving manoeuvres defined by ISO norms (step steer input and steady state cornering). As a consequence of unsatisfactory initial validation results, the differences between measurements and simulations were analysed, which led to gradual enhancements of the model with additional inputs to achieve better accuracy of simulations. The final part of the thesis deals with the comparison of influences of individual aerodynamic parameters on vehicle handling and the assessment of overall significance of aerodynamics compared to other factors which were taken into account (tires, mass properties, steering etc.). This thesis was realized in close cooperation with Škoda-Auto.
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Jeřábek, Petr. "Vliv parametrů odplyňování na kvalitu Al odlitků." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382188.
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This master’s thesis is focused on optimalization of degassing parameters in the foundry plant and effect of these parameters on mechanical properties of Al-Si alloys. In practical part is used factorial experiment to research effect of degassing parameters on mechanical properties and dichte index. After optimalization the new process is validated by comparing with the previous one. This experiment was taken on AlSi7Mg0,6 alloy in foundry plant MESIT foundry, a.s.
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Dušek, Otakar. "Vliv hmotnostních parametrů vozidel na jízdní dynamiku." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241368.
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This diploma thesis deals with assessment of weight parameters impact on driving dynamics. History and basic categories of personal vehicles are described in the introductory part. Weight parameters and driving dynamics of personal vehicles are described in the next part. Methodology and results of realized driving tests (braking test, circular test and avoidance maneuver) are presented in the experimental part of this work. Simulation of realized driving tests that was made by simulation software Virtual Crash is devised in the penultimate chapter. Evaluation of results that were found out from realized and simulated driving tests is made in the last chapter. Achieved results are briefly summarized in conclusion.
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Brabec, Martin. "Vliv výrobních parametrů na plasticitu konstrukční oceli." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416434.
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The master thesis deals with the influence of heat treatment and storage time on microstructure and mechanical properties of 26MnB5 steel, which is used in the production of tubular components in the quenched and tempered state. The objective was to increase the plasticity of the steel by the definition of new process parameters of the induction heat treatment line. New tempering diagrams of 26MnB5 steel for two various speeds of the heat treatment line were established and used to determine new tempering temperature and speed of the heat treatment line. Observation of the influence of storage time on mechanical properties of the steel did not reveal that it is liable to ageing.
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Hriczo, Filip. "Vliv změny vstupních parametrů na výrobu nanoporézní keramiky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218572.
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This thesis examines and tests acids and conditions, which make the production of nanoporous ceramic at the thin aluminium layer the most effective and provide the highest quality. This paper describes the production of nanoporous structures with pore size 15-400 nm, depending on the electrolyte. Creating a regular hexagonal structure by electrochemical oxidation is dependent on many parameters that affect the regularity of structure and parameters of the ceramics produced. They were investigated primarily by changes in temperature and input voltage. All results were examined by SEM analysis.
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Voburka, Tomáš. "Vliv parametrů tříbodového závěsu na tahové vlastnosti traktorů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417475.
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The diploma thesis is focused on the development of a mathematical model of the tractor-tool set in the MSC Adams program enabling analysis of the influence of the position of the upper linkage of the three-point hitch on the load of the driving wheels during the system operation. The measured force effects are analysed with focus on the adhesion load of the drive wheels and the traction properties of the tractor. Based on the calculations made, it determines the optimal setting of the upper link of the hitch for the connected tool.
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Popelka, Jan. "Vliv přenosových parametrů na spotřebu elektrické energie Zigbee zařízení." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219897.
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This thesis deals with the energy research and design a simple wireless sensor networks. The data modules with ZigBee wireless communication technology. The main feature of wireless sensor networks is the minimal energy devices at low cost and maximum data reliability. Furthermore, the work describes firmware for communicating nodes with the ability to change parameters of data transmission and thus affect the energy consumption node. Calculations of energy consumption, compared with the measured results, the discharge characteristics of the battery packs and lifetime broadcasting node is contained in the final chapters of this work.
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Zárybnická, Klára. "Vliv strukturních a procesních parametrů na vlastnosti polymerních nanokompozitů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-295723.
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The work deals mainly with preparation protocol of nanocomposites. The task of this work is to study structural and procedural parameteres that control the dispersion of nanoparticles in polymer solution to be able to prepare desired spatial organization of nanoparticles. The work resolves the effect of various components such as polymer matrices, nanoparticles and solvent, in which matrices and nanoparticles are blended. Used components control final dispersion state of nanoparticles and it influences also properties of investigated materials such as glass transition temperature, stiffness and rheological properties.
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Kopca, Filip. "Vliv parametrů odpružení a tlumení na jízdní vlastnosti vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318519.
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The thesis describes function and characteristics of spring and damper, their particular way and margin of influence on vehicle behavior in selected riding maneuvers. The goal is to maintaining maximal grip, control, and achieve predictable vehicle handling.
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Lederer, Vojtěch. "Vliv procesních parametrů zařízení Cyclone na kvalitu keramických skořepin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416631.
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Diploma thesis contains introduction into shell drying, its monitoring and influence on shell properties. The thesis works with the Cyclone machine described further. The shell drying process in the machine and experiments are carried out broadening understanding of functions and parameters of rapid drying process. Experiments comparing courses of drying under respective settings of Cyclone and under common drying in air-conditioned room are carried out. Also mechanical properties of commonly dried shells and shells made by the Cyclone machines are compared. The positive effect of the machine on the ultimate strenght of dried shells and positive effect on the drying speed has been confirmed.
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Košťál, Jan. "Vliv provozních parametrů kotle na přítomnost jemných částic ve spalinách." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318720.
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This diploma thesis is devoted to the issues of the formation of fine particles in dependents on the combustion parameters. The first part of thesis is review, which summarized the information about combustion process and about formation of the gaseous products and fine particles inside them which created during combustion process. The main content of thesis is realization of measurements of fine particles from combustion, in several types of the tested combustion devices. Next part is a description of used measurement devices, which used for measurement. Last chapters are focused on evaluation of results from the measurements, comparison of the measurements between themselves and the finding the existence of the dependence of the formation of fine particles on operational parameters of boiler. And all results are evaluated in the conclusion.
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Suchánek, Matěj. "Vliv parametrů MuCell technologie na mechanické vlastnosti polymerů pro vstřikování." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378395.
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This master’s thesis deals with influence of gas content in structure of polymer materials to mechanical properties. Test specimens were prepared by MuCell technology from polyphthalamide reinforced by 50 % of glass fiber content. The theorethical part of this thesis is focused on polymer materials with attention to polyamides and injection moulding technology. In the experimental part, the dependence between the characteristics obtained from the tensile test and the Charpy impact test on the amount of gas in the polymer is examined.
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Vlach, Jan. "Vliv svařovacích parametrů na kvalitu a mechanické vlastnosti svarového spoje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402552.
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The Master´s thesis focuses on the possibilities of using MAG welding on carbon steel 1.1221(C60E) without using preheating. It researches the effect of basic welding parameters on the final characteristics with the goal being to find a welding seam without defects, without using preheating.
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Kermes, Adam. "Vliv volby vstupních parametrů zařízení Blowerdoor testu na výslednou hodnotu průvzdušnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225752.
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The thesis examines the influence of choice of input parameters Blowerdoor test equipment on the final value of air permeability. Measurements have been performed on a set of four experimental buildings and one room.
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Zaremba, Matouš. "Vliv provozních parametrů na kvalitu rozprašování kapalin u dvou-médiových trysek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230587.
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This master’s thesis deals with measurement of spray characteristics of Effervescent atomizers intended for burning waste and heavy fuels. Atomizers were tested on cold test bench by means of Phase Doppler Anemometry. Spray characteristics were evaluated for many different regimes of pressure, temperature and Gas to liquid ratio. The aim of this measurement is to compare flow regimes and their influence on the quality of spray characteristics. The theoretical part describes basic fundamental principles of liquid atomization, effervescent atomization and principles of laser diagnostic methods. The practical part is engaged with improvements in test bench and setting up and optimization of the laser measuring system. Results contain visualization of spray, velocity profiles and drop size distribution in various operating flow regimes of the jet.
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Kaňa, Michal. "Vliv technologických parametrů na elektrochemické vlastnosti záporné elektrody lithium-iontového akumulátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-387737.
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This diploma thesis deals with lithium-ion batteries. It is focused on negative electrode on grafit based. The goal of this thesis is to show the problematics of lithium-ion batteries together with possibilities for improvement of their basic parametres as capacity and current elektricity loadability. The first part is focused on the description of functionality of lithiumion battery. The second part is practical and it is focused on production of negative electrodes from natural graphite 280H which has different thickness and compression pressure. The third part describes preparation of negative electrodes from natural graphite 280H and also includes results of measurement. In the last part are different types of negative electrodes from natural graphite 280H compared and evaluated including the determination of conclusions. This comparison and evaluation based on obtained data.
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Beránková, Monika. "Vliv parametrů ekvilibrace a mrazení ejakulátu býků na motilitu spermií po rozmrazení." Master's thesis, Česká zemědělská univerzita v Praze, 2016. http://www.nusl.cz/ntk/nusl-259931.
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The hypothesis assume the existence differences in bulls spermatozoa viability after thawing, characterized by higher values of motility and higher proportion of live spermatozoa, in case of prolonged equilibration and lower temperature freezing gradient. The aim of this thesis was to find the influence of different equilibration and freezing curve conditions to on spermatozoa viability after thawing. The theoretical part of the thesis summarizes available information about the bulls semen parameters, methods for its evaluation and especially the processing and long-term preservation.
Within the case study part of the thesis, during the years 2013-2015 the semen of the pre-selected group of 5 breeding bulls was being collected at the Sires insemination center. The group was uniform as to age, breed and housing and treatment conditions. After initial assessment the collected semen was divided into parts, which were then processed in different wals. A part of straws was processed by standard protocol, the other part was processed using different length of equilibration and freezing curve.
First part of the straws was equilibrated in a standard protocol for 120 minutes; subsequently half of the equilibrated straws was standardly frozen by the Direct Freezing method based on 3-phase freezing curve while the other half was frozen using the different 2-phase freezing curve. Second part of the straws was initially equilibrated for 240 minutes with the subsequent freezing, similarly as in the previous case, used 3-phase and 2-phase freezing curve. Frozen straws were then stored in liquid nitrogen container at -196 °C.
Spermatozoa motility was evaluated using CASA. The semen was further evaluated on the proportion of live and dead spermatozoa, using coloration of Eosin and Nigrosine, and on the sensitivity of the spermatozoa membranes, using HOS test, which detects the reaction of spermatozoa tail membrane to hypoosmotic conditions.
The obtained results indicated higher progressive spermatozoa motility (+5.57 %) and higher percentage of live spermatozoa (+4.47 %) following the application of the prolonged equilibration (240 min). When applying the length of equilibration 240 minutes, the values of total spermatozoa motility and HOS test were higher as well, though the differences were not statistically significant. When evaluate the effect of using different freezing curves on the parameters of the spermatozoa after thawing, higher values (average + 1.6 %) at almost all of these parameters using 3-phase freezing curve were found, the diferrences were not statistically significant.
Statistically significant differences among the bulls (P < 0.01) were found in total as well as progressive spermatozoa motility, in the proportion of living spermatozoa and in value of the HOS test - the individuality among the bulls is therefore evident. While evaluating the characteristics of spermatozoa movement by CASA, statistically significant differences among the bulls were confirmed at VCL, VSL, VAP, LIN, STR, WOB (P < 0.01), also between the diferrent length of equilibration (P < 0.01), but were not statistically significant when using diferrent freezing curves.
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Pavlíčková, Žaneta. "Vliv parametrů sýřeniny na vybrané ekonomické ukazatele výroby sýrů s bílou plísní." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216212.
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The theme of this diploma thesis is the monitoring of influences on economic aspect of the production of the blue cheese "Hermelín" in the company Pribina. The objective was to specify the dependencies of the deviations of the features of productive cow's milk and of cheese curd made from it and their economics impacts. For this purpose, the analyses of curd grain, whey and cheeses just formed were executed. The samples were taken and analyzed during the manufacturing of cheeses in the factory. Another goal was to try to design a quick operational method for measuring the firmness of curd grain, which is a factor theoretically dependent on renneting qualities of milk and indicating losses of valuable components from cheese curd to whey. The firmness of grain along with these losses may cause negative deviations from required standard of final products, especially at parametres needed for entry of cheeses on sale, such as total solids, weight or content of fat. Concerning productive pasteurize milk, the most attention was focused on the milk coagulation time and its influence on successive phases of manufacturing and on final product. Milk coagulation time is an essential technological quality of milk and it is participant on quantitative and qualitative production of cheese factory. It has been proved that milk coagulation time is notably affected by its titrating acidity, statistic analyse found this influence as very statistically significant (P
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Poláčik, Ján. "Vliv provozních parametrů spalovacího procesu na koncentraci jemných částic ve spalinách biomasových kotlů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-432539.
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This work deals with the impact of operating parameters on fine combustion particles formation in the flue gas of biomass combustion device. The research part of the work describes the properties of fine particles, its basic division, impact on human health and the environment. The basic knowledge of the influence of biomass combustion process on fine particles production up to 1 µm in size is summarized. The main part describes the experimental setup for evaluating the size distribution of fine particles. The following section describes the experimental setup with measured results for various combustion parameters in laboratory combustion, automatic boilers, as well as in the manual wood-burning combustion device. The main parameters which were tested were combustion temperature, oxygen amount, type of fuel and geometry of the burned biomass. The impact of individual parameters on the formation of the fine particles is evaluated. The final part of the thesis summarizes the ways in which it is possible to significantly influence the emissions of fine particles by the appropriate choice of combustion operating parameters.
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Schreier, Jan. "Vliv parametrů vazebného média a struktury povrchu na kvalitu snímaného signálu akustické emise." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230124.
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This master’s thesis deals with the influence of different AE sensor couplants and surface roughness on the selected acoustic emission parameters. There are compared the amplitude of the signal measured using five different couplants at 20°C and 80°C. To monitor the effect of surface roughness on the AE parameters simple measuring product was constructed. Its functionality has been verified by implementation of basic experimental measurements.
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Berka, Martin. "Vliv geometrie a řezných parametrů nástroje na zbytkové napětí při obrábění tlakových zásobníků." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241903.
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This thesis deals with the influence of changes in cutting parameters and tool geometry on residual stress inside the material. I examine the influence by deep drilling. Changing the cutting parameters concerns the alteration of the tool feed and the pressure of the coolant during the process. The influence of tool geometry is studied by using two different single edge cannon drills. The research was realized in cooperation with Bosch Diesel Ltd. The theoretical part includes a description of the injection system, in which a high-pressure container is contained. The high-pressure container was used to evaluate the influence of the cutting parameters and tool geometry on residual stress. Furthermore, the theoretical part deals with the deep drilling technology used and the theory of residual stresses. The practical part shows the measurement parameters and the corresponding results. In the conclusion of this thesis, a technical-economic evaluation of the measurement is conducted.
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Benešl, Lukáš. "Vliv fyzických parametrů a stáří silnoproudého vedení na výkonnost a spolehlivost PLC/BPL." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413002.
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BPL technology is quite widespread nowadays and the public is also somewhat aware of it. This technology can be used as a means of communication without the need to install additional media and thus use the existing infrastructure. In an effort to use the full potential of the technology, BPL communication began to be used to monitor the current state of cables in distribution networks online. Where the technology is already fully implemented, the distributor can use the data to evaluate the current situation. In this way, BPL technology can be used as a diagnostic tool to test the quality of a cable connection on which not only time but also humidity and other external influences could have a significant effect.
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Pospíšil, David. "Zvýšení tepelně-izolačních parametrů klasických obytných budov a jejich vliv na kvalitu vnitřního prostředí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229922.
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Master’s Thesis deals with utilization of energy simulation software in area of classic brick buildings and measures to decrease heat consumption. Introduction deals with historic development of heat loss demands in Czech Republic and ways how to decrease heat loss through different types of building elements. Next chapter is focused on indoor microclimate and it’s affecting factors. Last but not least are mentioned environmental and financial aspects of these adjustments. Final part shows examined buildings, simulation configurations and output evaluations.
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Šperka, Václav. "Vliv podstatných parametrů na velikost radiální vůle a deformačně napěťové stavy v kuličkovém ložisku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231182.
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Master thesis is focused on the research of influence of selected substantial parameters on stress – strain states in the deep groove radial ball bearing. The influence of radial load is analyzed, such as the influence of size of the bearing and row of the bearing, also influence of radial clearance is quantified. Next, the influence of thermal distribution in the bearing is analyzed for different combinations of thermal distributions and radial clearances. Conclusions from analyses are then used in the last task – suggestion of radial clearance for customer – specified assembly. Problem is solved using the finite element method (FEM) in pre/post processor MSC.Patran and solver MSC.Marc. To make analyses faster the substantial parameters are implemented in the algorithm for automatic generation of the bearing calculation (batch file).The theme of this thesis was commissioned by ZKL - Research and development, a. s.
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Křepela, Petr. "Studium vlivu procesních parametrů na vlastnosti svaru feritické korozivzdorné oceli při laserovém svařování s rozmítáním svazku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399433.
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The aim of this work was to carry out an experiment to assess the influence of the individual welding parameters in the laser welding method with the beam wobbling on the made weld, respectively. welds. The material which was welded was ferritic stainless steel with the designation 1.4016, which, like all ferritic steels, is susceptible to coarse grains and the resulting brittleness which leads to degradation of the mechanical properties of the weld. The welds were compared to a sample welded without wobbling an between themselves. Unfortunately, however, the evaluation of the test samples did not bring significant differences from laser welding without wobbling, however some changes are evident, such as grain orientation, weld defects, or uniformity of mechanical properties over the weld length, where wobbling frequency is most important. Further research should focus on limiting the porosity at higher wobbling frequencies in the shape of a circle or ellipse.
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Michal, Ondřej. "Stanovení hodnot materiálových parametrů s využitím experimentů různých konfigurací." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225579.
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The work occupy by inverse analysis based on artificial neural network. This identification algorithm enable correct determine parameters of applied material model on creation of numerical model of construction so it's possible that the results of computerized simulation correspond with experiments. It look's like suitable approach especially in cases with complicated problems and complex models with many material parameters.
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Krajkovič, Pavel. "Optimalizace obráběcích parametrů abradable nástřiků používaných v leteckém průmyslu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231999.
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This thesis is focused on machining of thermal spray coatings. Particularly on testing of machining parameters and their influence on different types of abradable coatings used in the aerospace industry. The aim of research work is to test the parameters, measure cutting forces by using a dynamometer and their impact on the quality of the machined surface. Determination of the optimal machining parameters for different types of coatings based on results of measurements and the evaluation of surface quality. There are also presented techniques of thermal spray application and methods of coating evaluation. Further it describes a method of measuring cutting forces by using the dynamometer and methods of surface quality evaluation.
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Šmíd, Michal. "Optimalizace makrostruktury odlitků z niklových slitin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230185.
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This diploma thesis is focusing on possibilities of influencing casting’s structure of nickel superalloy Inconel 713LC by force effects caused by vibration and rotation during crystallization. In this research were cast three test castings of turbine wheels with different solidification conditions that have affected the size and distribution of the grains. The aim was to compare the different microstructure and macrostructure of castings and then compare the dependence of grain refinement on mechanical properties. Changes in the structure were analyzed by means of light and electron microscopy methods after the fracture of test bars.
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Grufíková, Jana. "Vliv zdroje PEO na zvlákňování." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-316169.
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The electrospinning process of polymer solutions is affected by many different parameters that can be divided into solution parameters, process parameters, and ambient parameters. This study is focused on characteristics of a polymer and its solution, which are ranging into the solution parameters. The aim of this study is to compare poly(ethylene oxide) characteristics in the relation to electrospinning of hyaluronic acid, to find the difference between them using available analytic, thermic and spectral methods, and to define the influence of properties on polymeric solutions behavior during electrospinning. It was find that poly(ethylene oxides) obtained from two different sources behave differently in an electrostatic field, although their molar mass is declared as the same. It was also confirmed that the electrospinning process of polymeric solutions is affected mainly by their viscosity and conductivity. This two properties are determined especially by the molar mass of polymer and also by the content of impurities or content of some another polymer during electrospinning of mixed solution.
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Fuciman, Lukáš. "Rozbor a zhodnocení vlivů textury povrchu zkušebních vzorků." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417440.
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The thesis deals with an evaluation of the surface texture of various materials, created by machining technologies (turning, milling and grinding). As for the theoretical part of the thesis, it contains a theoretical analysis of the effect of surface texture on friction, wear, coating and lubricating properties. The main emphasis is put on the analysis of the most frequently evaluated profile and surface parameters as well as their possible influence on the functional areas of machined parts. The experimental part includes evaluated and compared measured data based on the monitored parameters with benefits for machinery industry.
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Zapletal, Tomáš. "Vliv povrchových rýh na přechod ke smíšenému mazání." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241176.
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The purpose of this diploma thesis is to describe the influence of artificially produced surface grooves on transition from full EHL regime to mixed lubrication in point contact using optical interferometry. This article focuses on influences of grooves orientation, length in contact area, elastic properties of contact surfaces and different types of oil defined by pressure-viscosity coefficient. Empirical prediction model of groove influence on film thickness was established based on experimental data. The groove influence was incorporated into lubrication parameter. This modified definition was compared to classic one. It showed that avoiding groove influence in classic definition lead to significant underestimation. Influence of groove on friction coefficient is also studied.
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Dus, Ondřej. "Vliv zastínění na parametry solárních modulů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217647.
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Prchal, Jiří. "Vliv LiOH na parametry alkalických akumulátorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219226.
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The deal of this thesis is study of the influence of LiOH added to electrolyte on Ni-Cd batteries. In theoretical part are analyzed properties of Ni-Cd accumulators in strong alkaline surroundings, especially with emphasis on structure changing of NiOH2 and NiOOH. In the second part of theoretical are also described methods for depositing Ni layers. In practical part electro-chemical spectrum and mass changing on Quartz crystal microbalance are measured by cyclic voltammetry method during charge/discharge process. The process of cation integration to the positive electrode structure in KOH, NaOH and CsOH electrolyte including related structural changes are observed.
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Kopečný, Aleš. "Vliv pneumatik na výstupní parametry traktorů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231708.
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The thesis summarizes the results of the measurement of the output parameters of the tractor, on which were mounted three different types of tires. The measured parameters are the maximum pulling power, slippage, specific effective fuel consumption at the maximum pulling performance. The final measured and calculated results are presented in tables and graphs. The results of the measurements were processed by the use of regressive analysis.
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Hrdlička, Martin. "Vliv teploty vzduchu na FDM 3D tisk." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318133.
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The thesis deals with 3D printing by the FDM and ambient temperature on print quality. The thesis describes the principle of printing by the FDM method and the occurrence of errors caused by the influence of ambient temperature. The aim of the thesis is to design a heated chamber for RepRap Prusa i3 printer, its construction and subsequent testing of ambient temperature influence on print quality. To test the occurrence of the described errors, specific tests and materials are selected in the work. The result of this work is the recommended ambient temperature in the heated chamber for improved FDM printing.
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Kosková, Markéta. "Vliv MR pulsních sekvencí na teplotu měřeného objektu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242059.
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This paper deals with the effect of the MR pulse sequences on the temperature of the measured object. The theoretical part is dedicated to basic principle of magnetic resonance, the selected pulse sequences and risks that are connected with MRI. There is also described the draft of the testing phantom and information about the measurement and record of temperature during MR measurement. In the experimental part the effect of RF coils, pulse sequences and parameters of pulse sequences are tested on drafted phantom with experimental MR device located at the Institut of Scientific Instruments of the AS CR in Brno. These findings are then tested on live laboratory mouse. All results are analyzed and used as default data for developed simulation program.
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Čech, Ondřej. "Vliv namáhání alkalických akumulátorů na jejich parametry." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217856.
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This master's thesis deals with alkaline battery characteristics and it has special consideration of nickel-cadmium cells. There are three main experimental parts in this paper. First one is concerned with positive electrode materials properties and is aimed to investigate impact of magnesium ions formed into nickel hydroxide electrode structure. Second part deals with battery charging/discharging and response measurement tool design. National Instruments hardware PXI modules for data acquisition was used and program in LabView environment was made. Last one is concerned with nickel-cadmium cell properties changes during increased temperature stressing. Investigation of cell self-charge changes during lithium hydroxide addition into electrolyte was made.
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Kiša, Michal. "Vliv vlhkosti paliva na parametry regulace kotle." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231264.
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The work deals with the verification of functionality of moisture content sensors MCT460-WP from the company Process sensors to measure fuel and products from biomass. The sensor is located on one of the Vyncke company boilers. In the first part of thesis are introduced basic issues of biomass. Thesis also generally describes the control and dynamics behaviour of biomass boilers and the effect of input parameters on the output parameters. The last part deals with comparing and analysing measured values with the calculated values and effects of moisture content changes on the output parameters of the boiler. As the last issue is loaded conceptual design based on on-line moisture sensing and inclusion of auxiliary fuel control into the existing system in order to stabilize the processes in the combustion chamber and output parameters. This should result in lower financial demands during boiler operation.
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Hudák, Igor. "Vliv inertních plynů na charakteristické parametry spalování." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-295650.
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The dissertation thesis is focused on the investigation of the influence of inert gases on characteristic parameters of the combustion process. Inert gases are usually standard components of alternative gaseous fuels such as the producer gas, coal gas or biogas. For a long period some of the fuels were considered as waste gases and their potential was not sufficiently utilised. Compared with noble fuels such as natural gas, alternative fuels have different physical-chemical properties. For example, their lower heating value (LHV) can be lower even than 10 MJ/mN3. The composition of the alternative gaseous fuels can be various during their production process. Lower LHV is a result of the occurrence of inert gases that does not take a part in the combustion reactions. Inert gases have the ability to accumulate the heat. Under certain conditions it is possible to combust alternative fuels on conventional burners, but due to their different properties, problems can occur during the combustion. E.g. to achieve the same heat output as with the noble fuel, it is necessary to burn bigger volume of the alternative fuel. However, the limiting factor could be the burner's head geometry. Theoretical introduction of the thesis summarizes research results in the field of low calorific gaseous fuels combustion and the addition of inert gases into the noble fuels. The thesis also describes the mechanisms of the NOx formation and summarizes techniques which can be used to reduce NOx formation. Furthermore, fuels from alternative sources are categorized and described, including their composition and characteristics. Their physical-chemical properties were obtained by means of the combustion simulation carried out in the simulation software. Two devices had to be designed and manufactured to fulfil goals of the dissertation thesis. The first is a gas mixing station capable of mixing 4 different components. The second device is a burner utilized for the combustion of low calorific fuels. The key section of this thesis is a chapter describing the experimental plan, the performance and the evaluation of the experiments. The goal of the experiments was to dilute the natural gas by two inert gases, namely carbon dioxide and nitrogen. The lowest LHV value achieved during the experiment was 10,7 MJ/mN3. The influence of the inert gases on the NOx emissions, the flame stability and characteristics, the flue gas temperature, the in-flame temperatures, the heat flux and the thermal efficiency was investigated and evaluated. Each parameter was measured and evaluated for three different burners: the burner with the staged gas, the burner with the staged air and the burner for low calorific fuels. Generally, after the addition of the inert gas into the noble fuel, the in-flame temperatures decreased. As a consequence, the NOx emissions decreased as well. The effects of carbon dioxide on the investigated combustion parameters were more substantial than the effects of nitrogen. Each measured parameter is strongly dependent on the burner geometry. The experiments revealed that in most cases the addition of the inert gas into the fuel influenced the flame length (flame shortened) and also more heat was transfered into the chamber's walls closer to the burner tile.
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Kuthan, Jiří. "Vliv teploty na parametry lithium - iontových článků." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399591.
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Masters Thesis summarizes the theoretical findings about lithium-ion akumulators. It gives a overview of the basic types of galvanic cells, then deals in detail with the lithium-on cell. It's composition, electrochemical principle of working, thermal dependence, construction and area of application. The thesis describes the basic methods of measuring lithium-on cells, such as cyclic charging and discharging, cyclic voltammetry. The practical part compares selected types of materials for negative elektrodes in different temperatures.
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Vítů, Renata. "Vliv parametrů skladování na jakost vajec." Master's thesis, 2007. http://www.nusl.cz/ntk/nusl-92572.
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Dostalík, Mark. "Vliv materiálových parametrů na stabilitu termální konvekce." Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-346943.
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The thesis is focused on the investigation of Rayleigh-Bénard problem in an extended setting approximating the conditions in the Earth's mantle. The aim is to evaluate the influence of depth- and temperature- dependent material parameters, dissipation, adiabatic heating/cooling and heat sources on the qualitative characteristics of thermal convection. We identify the critical values of dimensionless parameters that determine the onset of convection and characterize the dominating convection patterns in marginally supercritical states. These issues are addressed by the application of linear stability analysis and weakly non-linear analysis. It has been found that the character of convection differ substantially from the standard case of Rayleigh-Bénard convection. Powered by TCPDF (www.tcpdf.org)
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Pekař, Josef. "Vliv technologických parametrů na pevnost lepených spojů." Master's thesis, 2007. http://www.nusl.cz/ntk/nusl-93964.
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ROUŠAL, Jiří. "Vliv vybraných parametrů na kvalitu masných výrobků." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-180860.
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This Mater´s Degree Thesis focuses on the sensory analysis of the chosen products of the non-perishable meat products in the dependence on the production technology. Its aim is to compare what kind of the products is prefered by the consuments using the sensory analysis and then statistic evaluation. The theoretical part summarizes the findings of the sensory analysis of the products, it also includes the conditions of the analysis and the statistic evaluation, sense perception in general and the production technology of meat products. In the practical part is described the method and the results of the hedonic test performed. In the thesis were used for evaluation the samples of the non-perishable meat products of the leading Czech producers of non-perishable meat products distributed and available in the shops in the Czech Republic.
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Novotný, Vojtěch. "Vliv parametrů porostu na práci sklízecí mlátičky." Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-362727.
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The thesis Effect parameters stand on the work of the combine, deals with the relationship between grain yield per hectare and loss of grain per hectare. Measurements were carried out on axial harvester. When measurements were compared to the value of losses at different yields and different setting combine. The job losses were measured on grain crops of spring barley, winter wheat and oilseed rape. Changing the setting was focused on the speed of the rotor, the gap baskets, fan speed and the gap of the upper and lower sieves. These setting values are compared with the original factory settings. They were compared to losses of grain and fuel consumption at each setting with the same yield.
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Nedoma, Roman. "Vliv parametrů pozemku na výkonnost sklízecí mlátičky." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-427031.
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The thesis Influence of parameters of the plot on the efficiency of the combine harvester deals with the parameters of the land in terms of choosing a suitable method of movement. The theoretical part characterizes everything in terms of land movement, technology of controlled landings and related automatic machine guidance systems. The field measurements were focused on the comparison of motion during manual control, automatic machine guidance on the GPS plot, and motion-based motion tracking in permanent tracks. The data was measured on the CASE IH axial combine harvester with a 12.2 m mowing adapter. The key values are the individual paths of the selected motion and the mower adapter shots. The values obtained were processed, compared to each other and used for final conclusions. The resulting difference in driving distance per one hectare was up to 70 meters.