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Design of equipment for excitation of vibrations
Čípek, Pavel ; Šperka, Petr (referee) ; Frýza, Josef (advisor)
The bachelor thesis deals with the design of module for excitation of vibration. The module is a part of optical tribometer, a laboratory device. The tribometer simulates an interaction of two objects (steel ball and glass disc) in the presence of a lubricant. Very thin lubricating films between the objects are examinned. The new version of the tribometer enables research of lubricating film in conditions close to real contacts. The designed module uses an eccentric mechanism for excitation of vibration in a direction of the axis ball rotation. Set up of amlitude is enabled by changing eccentric part of the mechanism.
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Friction measuring of human joints
Šnejdar, Radim ; Ranuša, Matúš (referee) ; Čípek, Pavel (advisor)
This bachelor thesis concerns about the tribology of real joints. The aim of this work is an elucidation of the influence of chosen operating conditions on shear force coefficient. It deals especially about speed, strain and rehydration. The experimental tasks will be realized on tribometer, which is available in laboratories of ÚK. In this work, current state of knowledge in the area of discussed issues are described. Also the device and measured methods which help to measure and evaluate data files. In the last section of this work, the results are evaluated and the following conclusions are established.
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Adaptation of shock absorbers testing device on contact fatigue testing of dynamically loaded surfaces
Nepovím, Lukáš ; Čípek, Pavel (referee) ; Dvořáček, Jiří (advisor)
This bachelor’s thesis deals with the design of an adapter for the modification of a test device, where the automatic tensioners (dampers) of automotive belts are tested. The proposed adapter allows to test the functionality of the valve tappet assembly. The design of a simple test methodology is also a part of the solution. The first part of the thesis deals with the overview of the given issue. Subsequently, the design variants of the adapter and the loading methodology of the tested component are proposed. The main part describes the design of the adapter, the method of lubrication of the tested component, the measuring equipment used in the experimental test and the design of the test methodology. The complete drawing documentation of the adapter is the output of this work.
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The design of a quadrocopter for food delivery
Gryc, Matěj ; Čípek, Pavel (referee) ; Skurka, Šimon (advisor)
Online delivery of hot food to the customer's home has become standard. However, as a result of the covid-19 pandemic, methods of safe delivery that do not require interpersonal contact are now being sought. The use of drones, which are already being used in some countries to transport goods and materials, seems promising. This bachelor thesis deals with the design and assembly of a quadcopter designed for food delivery. First, the frame was designed, which was largely fabricated using 3D printing. Based on calculations, the electronics including batteries and motors were selected. Then the mechanism by which the food transport will be mediated was designed. Once constructed, the functionality of the quadcopter and delivery mechanism was tested. Finally, the design was evaluated and possible improvements were mentioned.
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Design of a sample grinding jig
Potoček, Samuel ; Čípek, Pavel (referee) ; Omasta, Milan (advisor)
Friction analysis using the device Mini-Traction-Machine (PCS Instruments) leaves a minor amount of surface and subsurface damage on the test surface of samples. Samples like this cannot be used for further testing. This thesis deals with the design of a grinding head that can be mounted on an existing manual grinder owned by BUT FME. In the first, research part of this thesis can reader learn about methods and machines commonly used for metallographic grinding and polishing, which inspired the design of this device. In the next chapter were proposed 3 concept designs of a sample holder, from which was one chosen to be further expanded in the last part of the thesis. The result of this thesis is a design of a grinding head able to work in a semi-automatic manner, working with more samples at the same time. The device regrinds or repolishes the damaged samples so that the samples can be reused for more friction testing. This in turn reduces the costs of test samples.
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Design of a milling table for machining wooden boards
Uhlíř, Radim ; Mazal, Pavel (referee) ; Čípek, Pavel (advisor)
The bachelor's thesis deals with the design and implementation of a milling table for machining wooden boards. In the research part, an analysis of the solutions available on the market was performed together with an analysis of workpiece fixtures, hand milling fixtures and linear guides. Based on the research, two conceptual solutions and several variants of structural nodes were proposed. The most suitable constructional solution was selected from the conceptual solutions, calculations of critical nodes were performed and drawing documentation was made. Subsequently, a prototype of the table was made and its functionality was tested. The table can clamp and machine a wooden board with maximum dimensions of 1000 x 800 x 100 mm.
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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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Effect of toothpaste abrasiveness on friction and wear of dental fillings
Formánková, Pavla ; Čípek, Pavel (referee) ; Vrbka, Martin (advisor)
This bachelor thesis dealt with research, that links dental hygiene issues with tribology. The aim of the thesis was to analyze the effect of abrasive particles of toothpastes on friction and wear of dental fillings. The friction coefficient was evaluated in a tooth brushing simulation on an UMT TriboLab tribometer that lasted 260 minutes. The tribological system consisted of a toothbrush, a sample of composite material and a solution of artificial saliva with a selected toothpaste. Each paste was defined by an RDA value from 0 to 250, expressing the degree of abrasiveness therefore the ability of the toothpastes to wear the material. Wear was analysed on a Bruker Contour GT-X optical profilometer. From the measured values it was found that the influence of abrasive particles is significant in terms of wear of dental fillings. For both the friction coefficient and the material loss when measured only in the presence of artificial saliva, the resulting values were generally lower. However, the material loss in the toothpastes measurments did not increase linearly with the RDA value as expected. Literature studies and measurements have shown that this may be due to other factors affecting wear. Future research on these factors could lead to the selection of more gentle toothpastes in dentistry and thus prevent the increase in wear of dental fillings
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The Effect of Synovial Fluid Constituents on Friction and Lubrication of Articular Cartilage
Čípek, Pavel ; Dr. Prashant K. Sharma (referee) ; Muňoz, Anna Neus Igual (referee) ; Vrbka, Martin (advisor)
Práce se zabývá problematikou biotribologie modelu synoviálního kloubu. Cílem práce je popsat vliv složek synoviální kapaliny na formování mazacího filmu v modelu synoviálního kloubu. Práce je zaměřena na experimentální analýzu součinitele smykového tření a jeho propojení s pozorováním adsorbovaného mazacího filmu v kontaktu pomocí fluorescenční mikroskopie. Součástí práce je návrh tribometru, který umožňuje vizualizaci v průběhu experimentů. Tribometr je vyroben, kalibrován a verifikován pomocí komerčního tribometru. Dále je součástí práce návrh metodiky experimentů včetně návrhu postupu pro zpracování a hodnocení výsledků. Pro zpracování záznamu z vizualizace kontaktu byl navržen speciální software, který pracuje na principu segmentace obrazu. Poslední část práce je zaměřena na aplikaci vyvinuté metodologie spolu s nově navrženým tribometrem, což umožňuje posoudit roli složek modelové kapaliny u formování mazacího filmu v modelu synoviálního kloubu. Experimentální část je založena na měření tření za současné vizualizace kontaktu. Tato práce prezentuje originální výsledky rozšiřující oblast biotribologie synoviálního kloubu, které mohou pomoci dalšímu rozvoji účinné léčby pacientů s nemocnými klouby.
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Design of a desk coin sorting machine
Uhrová, Simona ; Čípek, Pavel (referee) ; Svoboda, Petr (advisor)
The bachelor thesis demonstrates the design concept of a low cost electromechanically driven coin sorter that can be created by the utilization of additive manufacturing, specifically 3D printing. Technical drawing documentation of the chosen design concept is then provided as well as insight into the 3D printing process. In the conclusion, the working model of the coin sorter is created, and an analysis is offered of potential problematic areas as well as possible improvements and extensions.
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