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The design of eye-lens simulator
Špaček, Matěj ; Rebenda, David (referee) ; Nečas, David (advisor)
The aim of this bachelor thesis is a design of an eye-lens simulator. Tribometer module in pin-on-ring configuration was designed to allow direct observation of a contact zone. The survey of existing tribometers was conducted as a part of the thesis, based on which, three concept solutions were suggested. Final solution of the module was chosen and designed based on the concepts. The apparatus enables to simulate conditions of real human eye so it could contribute to a contact lens research and eye lubrication solution development.
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Design of reciprocal module fixture for wear and friction measurements in tribometer
Zeman, Petr ; Šperka, Petr (referee) ; Dočkal, Kryštof (advisor)
The thesis deals with design of a clamping fixture for fastening surface samples for the reciprocating drive of the tribometer. The fixture is designed to compensate for shape deviations of the samples by tilting in two axes in a small range. The objective has been fulfilled, the tilting mechanism is achieved by rotating the spherical surface. The fixture is sufficiently rigid. It has been achieved of better user experience and repeatability of clamping. The paper contains an overview of commercially available clamping methods, their evaluation and description of the construction of the newly designed device, which simplifies the clamping of uniquely shaped samples for the reciprocating drive of the UMT TriboLab tribometer.
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Comparison of frictional properties of cosmetic massage products
Dohnal, Petr ; Čípek, Pavel (referee) ; Vrbka, Martin (advisor)
This bachelor’s thesis examines tribological properties of massage products (creams and oils). Its aim is to create a comparison of the selected products. Tribometer in the pin-on-plate configuration was used for the experiment because of its ability to simulate the process of rubbing the product on the skin. Cowhide was used as a model of human skin. The attributes of products were compared based on the characteristics of the coefficient of friction during the measurements. Through the experiments a suitable parameter was found for easy comparison of the product's durability. According to the results the best oil was selected in terms of durability and lubrication. The thesis could be used as a basis for creating a standardised method for evaluation and selection of products suitable for massage purposes.
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Design of reciprocal module fixture for wear and friction measurements in tribometer
Zeman, Petr ; Šperka, Petr (referee) ; Dočkal, Kryštof (advisor)
The thesis deals with design of a clamping fixture for fastening surface samples for the reciprocating drive of the tribometer. The fixture is designed to compensate for shape deviations of the samples by tilting in two axes in a small range. The objective has been fulfilled, the tilting mechanism is achieved by rotating the spherical surface. The fixture is sufficiently rigid. It has been achieved of better user experience and repeatability of clamping. The paper contains an overview of commercially available clamping methods, their evaluation and description of the construction of the newly designed device, which simplifies the clamping of uniquely shaped samples for the reciprocating drive of the UMT TriboLab tribometer.
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Design of the loading mechanism for low load
Polnický, Vojtěch ; Galas, Radovan (referee) ; Nečas, David (advisor)
The aim of the bachelor’s thesis is to provide a design and full drawing documentation of instrument for applying low loads. In case of realization, the mechanism will be implemented into a ball-on-disc laboratory tribometer, which is used in the laboratory of IMID FME BUT in Brno. The first part of the thesis deals with research study of tribometers considering the configuration of test samples and loading mechanism systems. According to information analysis, four different variants are introduced. The final design is described in detail, including the information about the advantages and disadvantages. This design is developed into technical drawings and electronic models.
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Design of knee joint simulator
Polnický, Vojtěch ; Čížek, Petr (referee) ; Vrbka, Martin (advisor)
The diploma thesis is focused on the design and realization of an experimental device. The purpose of device is the simulation of dynamic and kinematic conditions of knee replacement during the walking cycle. The simulator will be used to study the formation of the lubricating film in contact of the femoral component and the polyethylene spacer, and to the cyclic wear tests for knee replacements. First part of thesis is focused on the description of working parameters of knee replacements and analysis of knee joint simulators. The description of conceptual design and selection of the final variation follows. The final design allows simulation of dynamic and kinematic conditions of ISO 14 243-3. Creation of lubricating film is analyzed by the non-contact optical fluorescence microscopy method. The work includes complete drawing documentation, wiring diagram, verification of the functionality of the device and detailed operating instructions.
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Tribology of hydrogels for articular cartilage replacement
Křížová, Michaela ; Ranuša, Matúš (referee) ; Vrbka, Martin (advisor)
The bachelor's thesis deals with the description of the tribological properties of focal joint implants in the place of a cartilage defect. The application of focal implants is aimed at a group of younger patients who have to undergo surgery to repair damaged cartilage, but a total replacement is not suitable for them due to its lifetime. The contact of the focal implant and the opposite cartilage was simulated using metal samples and hydrogel, which has very similar properties to natural cartilage. For a possible comparison of values, a tribological measurement of the cartilage samples against the hydrogel was carried out. This pair serves as a model for defining friction in a healthy joint. The main task of this thesis was to determine the coefficient of friction of Ti6Al4V, Ti6Al4V+DLC, CoCrMo and cartilage against the hydrogel. The experiments were carried out using a tribometer in a pin-on-plate configuration. The Ti6Al4V alloy without coating and with DLC coating came out with the lowest coefficient of friction for both variants, almost identically 0.0526. Higher friction was measured for CoCrMo, but it differed from the titanium alloy to one-hundredth. On the contrary, the highest coefficient of friction was unexpectedly manifested in the cartilage samples, where the lowest friction was assumed. The error was due to poor selection of cartilage samples. The thesis simply describes the tribological behaviour of focal implants and the result is a material with the lowest coefficient of friction. The measurements performed could help further research into the issue of focal implants.
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