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Strain, stress and strength analysis of the ball bearing considering the contact conditions
Prášil, Jiří ; Návrat, Tomáš (referee) ; Vrbka, Jan (advisor)
Motivation of this master‘s thesis is solution of practical problem of the newly developed slewing ring for tram Škoda, type: 15T. Next impulse for thesis creation was the possibility to extend product range of roller bearing ZKL. There is processed strain – stress analysis of bearing inner design making use the finite element method (FEM). Obtained results are compared with classic approach based on the Hertz theory. Important aim of this work is three main parameters optimal establishment: rolling element diameter, arrangement radius and number of rolling elements. Optimization job is realized by solutions of direct tasks with different parameters. With regard to necessity of detailed stress analysis and conservation of reasonable computational time it was chosen approach of combination global and local FEM model. It was used pre/postprocessor PATRAN and solver MARC for solution of strain and stress analysis. Analytic solution was accomplished in software EXCEL.
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The Studies During the Engagement Organizations
Čížková, Šárka ; Prášil, Jiří (referee) ; Jurová, Marie (advisor)
This diploma thesis is named The Optimization of the During Contract Chosen Through Company. It deals with an order management in ABC company which is focused on construction and service of telecommunication networks. The thesis is consist of theoretical background and analysis of current situation of the company. The first part is focused on theoretical background which are crucial for understanding to bussines process management. The analysis of current situation describes how the ordes is managed nowday. The thesis also contains suggestions how to solve determinated problems. This may lead to obtaining of new orders, increasing of satisfaction of customers, and increasing of competititvness of the company.
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Stress and strength analysis of the bike frame and compliance assessment at selected construction places.
Prášil, Jiří ; Horníková, Jana (referee) ; Vrbka, Jan (advisor)
Purpose of this work was the realization of stress and strenght analysis of the bike frame with the help of the basic elasticity approach. At first I had to transfer this task from three-dimensional to two-dimensional and also to simplify to fulfill the beam conditions. I also focused on static safety of the construction. This static safety was solved for two loading modes. First one was define as the load, which cyclist can induce, when he is going on the direct road. Second one was defined as the load, which he can induce, when he is going up to the hill. I used for these calculations mathematical software such as Mathcad 14 or Maple 12, but also modeling software especially Autocad for establishing correct dimensions. At the end I checked the stress and strain analysis obtained by the basic elasticity approach with the solution performed making use of the ANSYS software code.
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The assembly gap influence on the stress and strain at the radial ball bearing
Rašovská, Hana ; Prášil, Jiří (referee) ; Vrbka, Jan (advisor)
This master thesis deals with the influence of assembly clearance on strain and stress in the radial ball bearing. The theme of this thesis was commissioned by ZKL - Research and development, a. s. For six different assembly clearances and selected ball bearing was made force-loaded static analysis of global computational models. Subsequently was made a static analysis of local computational models loaded by strain according to the results of global models. The output of analysis of local models was sizes of stress, which led to the analysis of bearing with two other models of material. For the solution of the problem was used pre/post processor Patran and solver MSC.Marc.
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Techniques solving the fiber optic dispersion on current optical links
Prášil, Jiří ; Pfeifer, Václav (referee) ; Reichert, Pavel (advisor)
This diploma thesis deals with analysis of current diagnostic methods of optical networks, and it is focused on optical fiber dispersion in singlemode fibers. The work starts with a describtion chromatic dispersion and polarization mode dispersion, causes of and thein influence on the transmitted signal at the beginning. There are set out principles and their appropriate use in the list of measuring methods. Furthermore, the work are given the current possibilities for compensation above dispersions. The sixth chapter deals with the measurements and simulations of real routes in the OptiSystem. There are given appropriate compensation methods for the selected route speeds in the last chapter. The simulation is performed for the bit rate 2.5 Gbit / s, 10 Gbit / s and 40 Gbit / s.
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Passive rehabilitation affecting on spasticity of multiplex sclerosis
Prášil, Jakub ; Bunc, Václav (advisor) ; Foubíková, Bohdana (referee)
Title: The influence of a passive rehabilitation on spasticity in multiple sclerosis Objectives: The main objective is to summarize the current knowledge about multiple sclerosis and the possibilities of influencing the spasticity as a serious symptom. Another objective is to verify the effectiveness of the antispastic passive rehabilitation of the lower limbs of selected patient in practice. Methods: Verification of the effectiveness of the system of antispastic passive rehabilitation of the lower limbs was through a qualitative research. For the work design is used the type of qualitative experiment. The research sample is a person with spasticity in the lower limbs. In the first two parts of the work was used an analysis of scientific literature and a content analysis. The strategy of data obtaining is also in the form of observation, interviewing, measuring, scale and variety. A medical documentation, anamnesis, casuistry and a secondary analysis were used. Results: Individual use of each method resulted in the influence of spasticity only for a short time. Mobility was affected in the sense of passive movement the most after the soft techniques and massage therapy. The most striking results were achieved after the use of all methods when the spasticity was positively influenced in accordance...
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The assembly gap influence on the stress and strain at the radial ball bearing
Rašovská, Hana ; Prášil, Jiří (referee) ; Vrbka, Jan (advisor)
This master thesis deals with the influence of assembly clearance on strain and stress in the radial ball bearing. The theme of this thesis was commissioned by ZKL - Research and development, a. s. For six different assembly clearances and selected ball bearing was made force-loaded static analysis of global computational models. Subsequently was made a static analysis of local computational models loaded by strain according to the results of global models. The output of analysis of local models was sizes of stress, which led to the analysis of bearing with two other models of material. For the solution of the problem was used pre/post processor Patran and solver MSC.Marc.
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Strain, stress and strength analysis of the ball bearing considering the contact conditions
Prášil, Jiří ; Návrat, Tomáš (referee) ; Vrbka, Jan (advisor)
Motivation of this master‘s thesis is solution of practical problem of the newly developed slewing ring for tram Škoda, type: 15T. Next impulse for thesis creation was the possibility to extend product range of roller bearing ZKL. There is processed strain – stress analysis of bearing inner design making use the finite element method (FEM). Obtained results are compared with classic approach based on the Hertz theory. Important aim of this work is three main parameters optimal establishment: rolling element diameter, arrangement radius and number of rolling elements. Optimization job is realized by solutions of direct tasks with different parameters. With regard to necessity of detailed stress analysis and conservation of reasonable computational time it was chosen approach of combination global and local FEM model. It was used pre/postprocessor PATRAN and solver MARC for solution of strain and stress analysis. Analytic solution was accomplished in software EXCEL.
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