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Analysis of the procedure for identifying potentially dangerous locations of weld joints in thin-walled metal structures during life assessment
Doležel, Daniel ; Pavlík, Ondřej (referee) ; Vosynek, Petr (advisor)
Hodnocení únavy svarů u tenkostěnných kovových konstrukcích je klíčové pro zajištění integrity navrhovaných konstrukcí. Navzdory zavedeným kritériím a S-N křivkám může být analýza životnosti svařovaných spojů u geometricky komplexních součástí značně komplikovaná. Hlavní překážkou je identifikace kritických míst z hlediska únavy pro detailní výpočet, což může být časově náročné i při využití metody konečných prvků (MKP). Tato práce podrobně zkoumá hodnocení únavy svarů, zahrnuje vhled do relevantní literatury, komerčních řešení a praktický kontext norem železničního průmyslu a směrnice FKM. Významným přínosem práce je vývoj automatizovaných FEMAP API programů pro MKP software Siemens FEMAP, které usnadňují proces analýzy. Tyto programy šetří čas a úsilí tím, že umožňují zjednodušenou analýzu založenou na konceptu lokálního nominálního napětí (local nominal stress) v souladu se směrnicí FKM. Metodika, podpořená vyvinutými programy, je v této práci popsána a prakticky demonstrována. Praktické přínosy této práce spočívají v poskytnutí alternativy ke komerčním softwarům, za účelem zvýšení efektivity analýzy životnosti svarů v kontextu konstukčních návrhů.
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Factors affecting engine health as a function of pilot activity
Trtíková, Klára ; Vrána, Michal (referee) ; Červenka, Miroslav (advisor)
The thesis deals with the lifetime of piston engines depending on the pilot's activity. Especially the problems of overheating and undercooling, which can be mostly avoided by proper piloting. This thesis opens this topic with a description of the problems caused by engine overheating and undercooling, describes various situations where this phenomenon may occur and its consequences. Further chapters continue with evaluation of operator and pilot questionnaires, description of engine limits and recommendations from the manufacturers of four different engines, an analysis of specific cases of failures due to severe thermal shocks, and a finally summarizes recommendations for pilots. The final chapter recapitulates experience on this topic based on interviews with hands-on aircraft engineers and maintenance technicians.
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Workplace for measuring capacity and rate-capability characteristics of lithium-ion batteries
Cápal, David ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This master's thesis deals with the issues of lithium-ion batteries, describing common types of commercial lithium-ion batteries, their advantages, disadvantages, and characteristic properties. The thesis focuses in more detail on the influence of temperature on the characteristics of lithium-ion battery. The thesis describes the design and construction of a workplace for measuring capacity and rate-capability characteristics of lithium-ion batteries at low and high temperatures. The thesis also describes the implementation of a cooling and heating module using a system based on Peltier devices.
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Price of the works in terms of investor
Chalupová, Hana ; Comorek,, Martin (referee) ; Marková, Leonora (advisor)
The aim of this bachelor thesis is to built the optimal price of the works in terms of investor. The compilation of construction cost of a family house considering the charges resulting from its usage. Two functional segments from the budget were chosen for creating an alternative solution including the costs assessment and the life cycle costs. Finally, the optimal variant of materials was chosen and the price was compiled.
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Life cycle costs of residential building
Biolek, Vojtěch ; Marková, Leonora (referee) ; Nový, Martin (advisor)
The aim of this work is to introduce the topic "Life cycle costs for residential buildings" and a specific example to compare the real cost with the model, resulting in the operating phase of the life cycle of a building, using indicators BLCC. The paper also solved possible replacements for alternative materials selected functional components that can be positively or negatively affect other life cycle costs. These solutions can be used investor to invest in other phases of the life cycle of the building.
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Testing of Vehicle Suspension Components
Šidla, František ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
This bachelor thesis deals with issues related to testing car chassis components during development. Automobile transport is the most common type of long-distance transport. That's why vehicles are constantly evolving to provide the best possible performance. Increasing demands on consumers are being placed on vehicles because of the introduction of modern technologies. New technologies and concepts need to be thoroughly tested that they can be properly integrated into existing models. Test devices for determining the characteristics of the chassis are generally described here using specific examples of individual machines. Subsequently, the work clarifies the testing of the service life of individual parts of the chassis. The last part is devoted to the conceptual design of a simplified hydraulic device for testing coil springs. From the calculated characteristics, a hydraulic actuator and pump are selected from the relevant catalogues. In conclusion, the importance of car testing in development is summarized, individual types of testing are described and the readiness of test devices for the future is indicated.
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Design of elongated right angle milling head for horizontal boring machine
Svoboda, Ondřej ; Tůma, Jiří (referee) ; Holub, Michal (advisor)
This thesis deals with design of right-angled elongated milling head for horizontal boring machine of FERMAT production. The thesis includes a detailed research of milling heads, a description of the head´s basic components and certain commercially available head´s comparison. Design part is describe components description and the design. Calculations are focused on determinating of forces generated during machining, setting of loading spectrum and the power load calculating individual gears during machining. In the next part is calculation of the reactions in the spindle bearings included, the equivalent load and durability of spindle bearings, spindle deformation and spindle bearings optimum distance. The thesis also includes spindle strength calculation, horizontal and vertical shafts analysis, gears design with helical teeth and gear strength. The thesis describes the design of extended milling head and particular design nodes which is supplemented by the 3D model. In this thesis is also included a drawing of assembly and components.
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Increasing the life of blanking punch by coating
Šplíchal, Jan ; Lidmila, Zdeněk (referee) ; Podaný, Kamil (advisor)
This Bachelor thesis presents possible methods for increasing the lifespan of cutting tools made of steel 19 436 designed for cutting stator and rotor plates made of silicon steel. These sheets are characterized by high hardness, which adversely affects the edges of the scissors. Experimental hardness measurement on delivered samples has verified the actual heat treatment on the surface and inside the scraper. The measured value 62 HRC corresponds to the input requirements. Based on the literature study, a combination of chemical – heat treatment and coating was chosen as the most appropriate method. In order to preserve the microstructure of the punch produced after the heat treatment, it was necessary to apply the coating by physical vapor deposition, which is characterized by low deposition temperatures. The FeinAl coating will be applied by cathodic arc deposition and is primarily designed to protect tools and cutting tools.
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Criteria of multiaxial fatigue life
Bauer, David ; Slámečka, Karel (referee) ; Horníková, Jana (advisor)
This bachelor's thesis focuses on determination of lifetime of material under multiaxial cycle loading. This knowledge is important for a good design of the most machine parts. The thesis includes a short description of the proces of material fatigue, which is consequence of cyclic loading. It contains fatigue criteria for the case of uniaxial and multiaxial loading too. From a large number of multiaxial criteria are chosen energy-based and stress-based models.
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