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Verification of interaction between the foundation plate and the pile
Kozáková, Marcela ; Hrubešová,, Eva (referee) ; Turček,, Peter (referee) ; Horák, Vladislav (advisor)
The doctoral thesis deal with the interaction between the foundation plate and deep foundation in the form of bored piles in the case of skeleton construction. The issue of tension redistribution from the column between the plate and the pile is investigated on specific object – „Shopping and entertainment center Fórum Nová Karolina”. On this object were selected columns monitored and load tests of the piles was executed. Values of the axial loading of the piles and the actual deformation of the construction have been derived from measurements and tests. They were compared with the results of structural behavior by numerical modeling.
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Load bearing RC structure of office building
Ferencz, Balázs ; Zlámal, Martin (referee) ; Šimůnek, Petr (advisor)
The Master’s thesis is focused on the analysis and design of selected members of load-bearing structure of an administration building according to the ultimate limit states (ULS) and seviceability limit states (SLS). The calculation and the analysis was supported by design software SCIA ENGINEER 2012. Structural analysis deals with the design of the reinforced concrete (RC) flat slab above the 4rd strorey which is particularly supported by RC columns and particularly lies on RC walls. Furthermore, the Master’s thesis contains analysis of some selected columns of last three storeys, column of lowest storey, construction of stairway between 4rd and 5th storeys. The work beside this deals with the calculation and design of foundation of the object. The rest parts of the load-bearing structure are not solved in the Master’s thesis.
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Design of a test condition for determining the wear at the contact of a railway wheel and rail
Rec, Matouš ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This diploma thesis focuses on the issue of a wear of a railway wheel and a rail. The wear of the components depends on a number of parameters including the contact stress, the contact pressure and the contact surface dimensions. Among the factors determining these parameters belongs primarily the wheel driving gauge, the rail profile and the load of the contact area. Furthermore, the material from which the wheels and rail are made, the roughness and hardness of the functional surfaces and the residual stress in the material have a significant impact on the wear. All the parameters mentioned above are designed for the production of the railway wheels and rails and therefore they meet the standards for the production of these components. However, the existence of the changeable parameters has also a significant impact on the wear. These parameters include the presence of contaminants, or lubricants in contact, the changing driving gauge due to the wear, the slip ratio or the friction coefficient. With the wear being an inevitable process during the application it cannot be eliminated but only controlled. Applying the lubricant into the contact when passing through the arc in order to achieve an ideal coefficient or the maintenance grinding for restoring the driving gauge can serve the purpose. If properly optimized, the importance of the wear research lies in the financial savings. Being the crucial factor for optimization of the intervals between the maintenance grinding, the research is also beneficial. A high-quality wear prediction can be seen as the key field in order to increase the safety of the railway vehicles operation as well. Therefore, the wear research is made using several methods, such as the computational models, the multi-body dynamics software and the technical experiments. This thesis introduces a conceptual design of the test, enabling the wear research via experimental approach. The final device is capable of a simulation of both volume and fatigue wear during the states the railway wheel and railway undergo including riding on the straight track, passing through an arc or a wheel slip during braking.
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Reinforced concrete aeration tank
Vlach, Jakub ; Strnad, Jiří (referee) ; Šulák, Pavel (advisor)
The aim of this work is to design and static analysis features open embedded aeration tank wastewater treatment plants, in particular the assessment base plate and exterior walls. On the basis of reports is prepared drawings consisting of reinforcement drawings and drawing shapes. The proposal was made on the values of the internal forces of the outputs of computer program SCIA Engineer 2012-Student Edition.
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Influence of bevel gear modifications on the transmission error
Martinka, Tomáš ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This diploma thesis deals with the problem of transmission error in gears with a specific focus on bevel gears with straight teeth. The course of the transmission error and especially its peak value (PPTE) directly affects the noise of the transmissions and thus the noise of the entire gear device. In the long term, therefore, one of the main goals in the field of gear manufacturing and application is to reduce the value of PPTE. In this work, the influence of the modification of a specific bevel gear on the resulting static transmission error (STE) under static conditions is investigated. One way to modify a gear is to use a macrogeometric approach, where it is possible to adjust the number of teeth, gear modulus, gear engagement angle, and other factors that further affect the size of the gear and can significantly affect the resulting forces in the gearing. which can further lead to the impossibility of installation in the existing equipment and therefore this approach must be taken into account when designing the equipment. Another possibility is a microgeometric approach, which, with sufficient load-bearing capacity of the equipment components, will allow the assembly of gears in existing equipment while maintaining the original dimensions of the gears. The research of this thesis includes the definition and classification of gears based on the relative angle of the axes of rotation of the wheel and pinion, the geometry of the teeth and the pitch and the shape of the control curve of the teeth. Another area of focus of the research is the definition of the transmission error and the effects of its course on the noise of equipment equipped with transmissions. The practical part of this work is focused on the comparison of the course of the STE detected by the finite element method (FEM) in the program Ansys Workbench 2022/R2, into which individual variants of the gear models with applied adjustments were exported in the STEP format. and further modified in the Space Program Claim. The work is focused on investigating the effect of the size of a short height modification for multiple load moments, the effect of tooth height modification, the effect of shape modification and the effect of wheel axial position deviation on STE. The results of the analysis of the individual variants are compared based on the course of the results of the transmission errors with regard to the maximum contact stress of the flanks of the engaging teeth and the maximum stress in the heel of the tooth.
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Design of a test condition for determining the wear at the contact of a railway wheel and rail
Rec, Matouš ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This diploma thesis focuses on the issue of a wear of a railway wheel and a rail. The wear of the components depends on a number of parameters including the contact stress, the contact pressure and the contact surface dimensions. Among the factors determining these parameters belongs primarily the wheel driving gauge, the rail profile and the load of the contact area. Furthermore, the material from which the wheels and rail are made, the roughness and hardness of the functional surfaces and the residual stress in the material have a significant impact on the wear. All the parameters mentioned above are designed for the production of the railway wheels and rails and therefore they meet the standards for the production of these components. However, the existence of the changeable parameters has also a significant impact on the wear. These parameters include the presence of contaminants, or lubricants in contact, the changing driving gauge due to the wear, the slip ratio or the friction coefficient. With the wear being an inevitable process during the application it cannot be eliminated but only controlled. Applying the lubricant into the contact when passing through the arc in order to achieve an ideal coefficient or the maintenance grinding for restoring the driving gauge can serve the purpose. If properly optimized, the importance of the wear research lies in the financial savings. Being the crucial factor for optimization of the intervals between the maintenance grinding, the research is also beneficial. A high-quality wear prediction can be seen as the key field in order to increase the safety of the railway vehicles operation as well. Therefore, the wear research is made using several methods, such as the computational models, the multi-body dynamics software and the technical experiments. This thesis introduces a conceptual design of the test, enabling the wear research via experimental approach. The final device is capable of a simulation of both volume and fatigue wear during the states the railway wheel and railway undergo including riding on the straight track, passing through an arc or a wheel slip during braking.
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Verification of interaction between the foundation plate and the pile
Kozáková, Marcela ; Hrubešová,, Eva (referee) ; Turček,, Peter (referee) ; Horák, Vladislav (advisor)
The doctoral thesis deal with the interaction between the foundation plate and deep foundation in the form of bored piles in the case of skeleton construction. The issue of tension redistribution from the column between the plate and the pile is investigated on specific object – „Shopping and entertainment center Fórum Nová Karolina”. On this object were selected columns monitored and load tests of the piles was executed. Values of the axial loading of the piles and the actual deformation of the construction have been derived from measurements and tests. They were compared with the results of structural behavior by numerical modeling.
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Optimization of mixer truck gearbox bearing arrangements
Górnisiewicz, Tomáš ; Mazůrek, Ivan (referee) ; Nohál, Libor (advisor)
This diploma thesis deals with a design and optimization of mixer truck gearbox bearing arrangements. The gearbox is an important part of mixer truck. Major emphasis is put on design of main bearing which is a key component of the gearbox because of high load applied on it. Two basic criterions were considered in main bearing design – dynamic radial load capacity and contact stress in contact of roller and raceways. Developed two-stage optimizing algorithm is based on standard bearing and allows to design new bearing which is specialized for carrying output shaft of mixer truck gearbox.
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Design horizontal exchange of the head - VA1-C
Vyplašil, Jan ; Holub, Michal (referee) ; Sýkora, Jan (advisor)
Diploma thesis deals with the concept of interchangeable straight spindle head type VA1-C, used for automatic clamping in 80 kW spindle head from production of TOS Kuřim. Thesis contains survey of interchangeable heads, analysis of the spindle housing, strenght analysis of the spindle with the safety calculations in critical sec-tions and analysis of the clamping mechanism together with the calculation of the camping force, which holds the tools in the spindle. Analysis of the camping mechanisms contains calculation of the contact stress between balls and housings. All results are shown in the graphs. In the last part of the thesis are described the construction elements using the model of the interchangeable head. Enclosed is the assembly drawing of the spindle head, bill of material, detail drawing of the spindle and also 3D model of the interchangeable spindle head.
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