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Design of mechanism for pronation and supination of the upper limb prostheses
Rebenda, David ; Košťál, David (referee) ; Paloušek, David (advisor)
The goal of of this work is to propose a mechanism for pronation and supination of the upper limb prosthesis and its subsequent implementation of functional prototype. The teoretical part summarizes the basic types of forearm amputation and the effect of restricting rotation of the forearm. It also describes the basic distribution of upper limb prostheses and drive types. Construction design includ complete technical documentation is made in Autodesk Inventor Professional 2013 and Rhinoceros 5.0 SR8. The prototype is made of aluminium and ABS plastic.
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Conceptual design of a gear tester for space applications
Florián, Vojtěch ; Černohlávek, Mikuláš (referee) ; Košťál, David (advisor)
This bachelor thesis deals with the creation of a conceptual design of gears tester for space applications. The tester must simulate space conditions and test whether the gear can operate in those conditions. It is more important to test the wheel material than its geometry. The work is divided into theoretical and practical part. In the theoretical part, a search of current knowledge of the issue is created. The second part describes several conceptual designs of testers and their models. Subsequently, a concept that can most faithfully simulate real conditions in low orbit is selected and described in detail. The final design of this concept will facilitate the testing of gears and minimize their failure rate during operation.
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Design of the finishing machine for rolling bearing's elements
Cagaš, Radek ; Křenek, Miloš (referee) ; Košťál, David (advisor)
The thesis deals with the design of the device that is used to improve the quality of the surface of spherical rollers. Spherical rollers are used for the measuring of the conditions in the EHD contact. The high roughness and waviness of the spherical rollers’ surface is a problem. Several machining methods are described in the theoretical part. The overview in theoretical part has been used for choice of the machining methods (lapping and abrasive polishing). The spherical rollers‘ machining system, its construction, electronics and control systems are described in the next section. The last part is focused on testing of assembled device, and on checking its functionality. The desired roughness of the spherical rollers' surface, suitable for successful interferometric measurement, was achieved by combining the selected machining methods. The roughness and waviness achieved was Ra0.01 micron Wa0.022 microns.
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Friction and air feeders for paper sheets
Svoboda, Ondřej ; Košťál, David (referee) ; Brandejs, Jan (advisor)
The thesis is focused on summarizing the evidence on the issue of paper sheets feeding at the final processing of documents. The thesis includes dividing of paper feeders, their characterization, and description of friction and air feeders, which are most widespread. As a model for the description methods of sheets feeding were used machinery CFM 700 and GPM 540A of Cyklos company. The thesis also compares friction and air feeding from the constructional point of view. The conclusion focuses on the new methods in the paper feeding in future.
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Influence of the grease aging to its behavior in the vicinity of the elastohydrodynamic contact
Navrátil, Marek ; Dzimko, Marián (referee) ; Košťál, David (advisor)
This thesis aims to describe the differences in grease behaviour caused by degradation. Observation of EHL contact and its surroundings is done using optical fluorescence, which allows to measure lubricant thickness even if it is discontinuous and air is present. New grease is observed, along with samples aged in bearings. One sample was worked for 1000 hours, which was the planned duration of the experiment. Two other samples were stopped prematurely after approx. 900 hours. Several possible age-related factors were examined and strong link between contamination and grease behaviour was found. In observed cases, contamination was identified to be the leading cause of lubricant shortage near EHL contact, which is one of possible bearing failure causes. The results expand existing knowledge about grease lubrication topic, but much further research is needed.
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Influence of the surface roughness features on the next rolling bearing element
Saksa, Vladimír ; Zapletal, Tomáš (referee) ; Košťál, David (advisor)
This bachelor thesis deals with investigation of influence of the surface roughness features on the next rolling bearing elements. It researches changes in the film profile entering into the contact. This thesis describes also elastohydrodynamic lubrication regime by witch each rolling bearing works as well as the difference between fully flooded and starvation contact of rolling ring with rolling bearing element. The part of the thesis is the experiment using different kinds of lubricats from which is visible really influence of these contacts. This experiment is realized on the contact simulator and the film thickness is measured using method of optical interferometry.
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Review of grease types
Mauer, Jindřich ; Ficza, Ildikó (referee) ; Košťál, David (advisor)
This bachelor thesis provides a basic distribution of greases according various aspects, which are used for lubrication the various components. The first part of bachelor thesis deals with the composition of greases. The following section describes the manufacture of greases. Another section includes the distribution of greases in terms of their composition. The following section is about distribution of greases in terms of practical use. The last part of the bachelor thesis deals with transmission electron microscopy, by this method is possible to examine the structure of greases.
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Design of the parametric model of the furnace carriage
Baláž, František ; Valena, Martin (referee) ; Košťál, David (advisor)
This bachelor thesis deals with the creation of an algorithmic model of a cart into the furnace using Inventor software. The emphasis is mainly on the speed and simplicity of editing. The adjustment is based on the change of parameters that resulted from the assignment. Thanks to this work, the editing speed will be accelerated several times. The results can help other companies to implement parameterization in practice and subsequently accelerate production.
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Design of a multifunctional leg rest box
Schmidtová, Markéta ; Košťál, David (referee) ; Svoboda, Petr (advisor)
The bachelor thesis deals with the design of a multifunction car box, which increases the comfort of children in car seats. The first part will describe requirements for ergonomically correct seating and development of the child. The height positions will be defined from these data and then the design solution will be executed. In the end stressed states and optimized solutions will be proposed.
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Design of gearing between transmission and alternator for drive of the superstructure of the heavy truck
Charouz, Ondřej ; Nohál, Libor (referee) ; Košťál, David (advisor)
This Bachelor´s Thesis presents an engineering design of gearing between transmis-sion and alternator for drive of the superstructure of the heavy truck. The gear ratio from engine to the output of transmission is 0,432 for normal constant meshing or 0,538 for reduced constant meshing. The performance of truck is 270 kW at 1800 rpm and torque 1850 N.m at 1000 +200 rpm. The thesis is focused on engineering design of location change of dynamo and not only to reduce the possibility of collisions between the chassis and the V-belt but also to make the whole construction simpler.
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