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Cost management of machinery in construction company
Jančová, Edita ; Biolek, Vojtěch (referee) ; Hanák, Tomáš (advisor)
The main theme of this bachelor thesis is the management of the cost of production machines in the construction company. In the theoretical part, the types of costs, costing and depreciation are defined in the first place, then the theoretical level is solved in machines in the building industry. In the practical part, the operating costs of two real machines are calculated, which affect the machine-hour rate. The calculated machine-hour rate is then compared to the real rate of both machines and improvements are suggested.
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Cost analysis of engineering structures
Klec, Martin ; Kudrna, Jan (referee) ; Výskala, Miloslav (advisor)
The thesis titled "Cost analysis of engineering structures" presents a comparison of the life cycle costs of linear structures with an asphalt surface against the life cycle cost of linear structures with a concrete surface. The thesis deals with prices, costs, calculations and budgets in its theoretical part. The following chapters present history and current status, road constructions, life cycle of the construction and differences between concrete and asphalt covering. Practical part of the thesis is divided into three parts. In each sub-section, there is a practical example of comparing the costs of the life cycle of linear structure with the asphalt surface against the costs of the life cycle of linear structure with the concrete surface. Everything is expressed in graphs.
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Li-ion traction battery 28V/40Ah for an electric bike
Bartošek, Martin ; Červinka, Dalibor (referee) ; Vorel, Pavel (advisor)
Thes is deals with the construction, protective circuits and lifetime of lithium ion batteries intented for powering electric bicycles. The entire battery is composed of Li-ion cells with the designation 18650 from Sanyo company, which are connected via series-parallel combination. Because of the series connection of the cells, it is necessary to add protective circuit to each cell to prevent overcharging or deep discharging, on which Li-ion cells are very sensitive. Absence of these circuits could cause irreversible damage to the entire battery pack. Life of Li-ion cells depends on many aspects. These aspects have an influence on the electric bicycle itself. They have an impact on the range and the number of charging and discharging cycles against the considerably high price of the battery.
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Assessment and evaluation of safety in power. machines
Hromek, Lukáš ; Janda, Marcel (referee) ; Veselka, František (advisor)
This thesis is focused on the security and improving of electrical rotating machines service life, especially asynchronous motors. Work includes a description of the most common disorders, short description of the asynchronous motor cage casting, analysis of provided decommissioned motors with photo documentation. The last part of this thesis is focused to vibrodiagnostic of asynchronous motor with simulated imbalance and motor emplacement by laser.
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The Impact of Different Manufacturing Technologies and Thermal Processing of Groove Profiles on the Service Life of Ball Screws
Drábek, Michal ; Jaroš, Aleš (referee) ; Sedlák, Josef (advisor)
The aim of this thesis is ball screw service life measurement. Text is divided on two major parts, theoretical one and practical one. Theoretical part describes three basic methods of ball screws manufacturing – rolling, whirling and grinding. Subsequently, methods of heat treatment (inductive and laser hardening) are mentioned. Practical part is devoted to ball screw service life testing and evaluation of results. Tests were carried out on two sets of two ball screws. First set was manufactured by whirling and grinding followed by inductive hardening. Second set was manufactured by grinding followed by inductive hardening in one case and laser hardening in the second one. Test results were evaluated according to international standards.
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Service life calculations in machine tools
Novotný, Lukáš ; Marek, Tomáš (referee) ; Holub, Michal (advisor)
The aim of this Bachelor’s Thesis is comparison of service life time calculations of machinetool construction parts according to different producers. The first part of thesis describes three important parts of machine-tools as linear guides, ball screw bearings and ball screws. Main part of thesis refers about search of service life time calculations itself according to various manufacturers and their comparison.
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Thermal Coatings for Glass Industry
Chráska, Pavel ; Neufuss, Karel
A new type of plasma torch with combined stabilization of electric arc by water vortex and gas flow is presented. This hybrid water/gas stabilization offers the possibility of adjusting plasma jet parameters within a wide range from high-enthalpy low-density plasmas typical for liquid stabilized torches to lower enthalpy higher density plasmas generated in gas stabilized torches. Moreover, gas flow in the cathode part protects a cathode tip and thus a consumable graphite cathode used in water-only stabilized plasma torches could be replaced by a fixed tungsten cathode. Examples of hybrid WSP torch utilization for high temperature application are given.
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