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Mechanical design of stend for lower limbs prostheses dynamic testing
Taufer, Tomáš ; Robenek, Dětřich (referee) ; Paloušek, David (advisor)
This work describes design and realization of testing device for dynamic tests of foot prosthesis, made by methods of Rapid prototyping. Primary objective of design is to imitate the load on prosthesis during human gait. This task is accomplished by swing motion of prosthesis inside the frame of device during the loading of heel and tiptoe. Loading components can be removed and changed so the device can be used for different measurement like walking on an inclined plane. The result of this work is fully functional device including control program with many options to control the test. The result of test is to decide whether the foot prosthesis withstands the set of cyclic loads. The area of development of prosthesis by additive methods is young for the time being. It stands out especially with different materials, design, structure of prosthesis and fast process of production. Therefore this device can be used for testing of fatigue life of prosthesis made by additive methods.
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Design of tester for electric hand tools batteries
Václavík, Tomáš ; Bednařík, Josef (referee) ; Krejsa, Jiří (advisor)
This thesis describes design and realization of simple testing device used to estimate State of Health of Li-ion accumulator pack. Basic parameters of Li-ion accumulators and methods used to examine their state are explored. Specific type of accumulator and its charger are analyzed. Complete device design, device realization, measurement records and their analysis are carried out. Algorithm for quick estimate of State of Health is created.
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Testing equipment for furniture hinges from Grass Czech s.r.o. in Český Krumlov, according to DIN EN 15570:2008-08
ŠIDLÍKOVÁ, Tereza
This piece of work dwells on the project of the furniture hinges testing equipment designed due to the demands and technical standards of Grass Czech s. r. o. in Český Krumlov, Czech Repub-lic. The research is based on the analyses of the production unit and the products it manufactu-res. The main part of the document consists of the construction components of the testing equipment modelled in Solid-Works computer program. It also contains supplementary docu-mentation needed to provide practical implementation in the conditions of the production unit.
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Design of equipment for measuring aerodynamically relevant parameters of passenger car tire
Kojecký, René ; Blaťák, Ondřej (referee) ; Vančura, Jan (advisor)
This diploma thesis deals with the issue of measuring tire parameters and their impact on vehicle aerodynamics. The aim is to create a design of the tire test equipment together with a suitable method for evaluating obtained results. The theoretical part provides an overview of currently used tire testing methods. The market research follows in order to select suitable components for the proposed measuring station. The output of the practical part of the work is the assembly of the solver in the form of a Matlab script and a design with the necessary drawing documentation.
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Testing of Vehicle Suspension Components
Šidla, František ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
This bachelor thesis deals with issues related to testing car chassis components during development. Automobile transport is the most common type of long-distance transport. That's why vehicles are constantly evolving to provide the best possible performance. Increasing demands on consumers are being placed on vehicles because of the introduction of modern technologies. New technologies and concepts need to be thoroughly tested that they can be properly integrated into existing models. Test devices for determining the characteristics of the chassis are generally described here using specific examples of individual machines. Subsequently, the work clarifies the testing of the service life of individual parts of the chassis. The last part is devoted to the conceptual design of a simplified hydraulic device for testing coil springs. From the calculated characteristics, a hydraulic actuator and pump are selected from the relevant catalogues. In conclusion, the importance of car testing in development is summarized, individual types of testing are described and the readiness of test devices for the future is indicated.
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Conceptual design of a polymeric gear tester in vacuum
Ptáček, Matyáš ; Šperka, Petr (referee) ; Černohlávek, Mikuláš (advisor)
The bachelor thesis deals with the conceptual design of a polymeric gear tester in vacuum. Using a test device, it is possible to test the coefficient of friction in gears. At the beginning of the work is described the issue of operating conditions of satellites in low orbit together with the effects that affect them. Subsequently, suitable polymeric materials are selected, and current publicly available test rigs are described. Based on the research, two conceptual designs are made, one of them is selected and described in detail at the end of the work.
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Compact equipment for mechanical durability testing air circuit breakers
Dušek, Pavel ; Šedivá, Soňa (referee) ; Štohl, Radek (advisor)
This master's thesis is focused on the description of mechanical durability testing of low voltage circuit breakers, description of circuit breakers Sentron 3WL and 3WA and the design of own solution for mechanical durability tests of Sentron 3WL and 3WA air circuit breakers. The solution itself consists of selecting components, designing the electrical schema, creating block diagrams of the program structure, creating the necessary software and verifying the functionality of the equipment.
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Test modules for automated testing of gas boiler controllers
Herbrych, Vojtěch ; Vyskočil, Pavel (referee) ; Dřínovský, Jiří (advisor)
This thesis deals with the design and implementation of test modules for measurement and PWM signal generation and communication using OpenTherm, for automated testing of gas boiler control units at Resideo company.This work builds on an already developer facility containing a set of measurement and test modules designed for simple automated testing of developed and manufactured equipment. The reason for the designing and manufacturing the additional modules is to extend the existing test set, automate the additional testing process and the extend the existing module, that no longer meets the current requirements of Resideo´s test engineers. The existing and newly developed test modules are based on ARM microcontrollers with a Cortex-M core, which communicate with the higher/level system using the MODBUS protocol via the RS-485 communication interface. The entire test system is connected to the bus in parallel and behaves as a RESPONDER (formerly known as SLAVE). The parent system (usually a computer) behaves as a CONTROLLER (formerly called MASTER). The power supply of the modules is unified (24 VDC) and is implemented on the existing communication and power supply module. For both developed modules, a circuit diagram was designed and possibly parts of the problematic circuits were simulated. Then the firmware was developed and the functionality of the modules was verified. All the requirements of the Resideo assignment were met and the modules can easily be extended in the future with additional functions. It will be also possible to modify the already developed functions impemented in the modules.
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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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Construction of a single-purpose machine for automatic testing of pneumatic fittings
Tejkl, Michal ; Štěpánek, Vojtěch (referee) ; Tůma, Zdeněk (advisor)
The subject of this diploma thesis is the design of a single-purpose machine for automatic testing of pneumatic fittings. Pneumatic fittings used in brake systems are subject to high technical requirements and 100% tightness control in production. In this case, manual testing is not effective and the goal is to automate the process. The theoretical part presents pneumatic mechanisms, analysis of the tested pneumatic fitting with technical parameters, the possibility of tightness testing, use of sensors, and rotary tables. In the practical part, a systematic analysis of the problem was performed, according to which the overall design proceeded. Subsequently, the design of the complete machine containing individual nodes is processed, supplemented by the necessary calculations. The conclusion of the thesis contains an evaluation of the whole project.
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