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Estimating the Equivalent Circuit of Lithium-Ion Batteries During Operation
Vašíček, Jakub ; Vyroubal, Petr
This paper deals with the issue of estimating the equivalent circuit of lithium-ion cells during normal operation. The study explores fundamental battery models, such as the simplified Randles circuit and the full Randles circuit. Conventional methods for model estimation, including Electrochemical Impedance Spectroscopy (EIS) and Galvanostatic Intermittent Titration Technique (GITT) are examined. The research extends into the real-world data analysis, gained from a home photovoltaic system. Using these data, an algorithm to estimate the equivalent circuit model during battery operation is evaluated. The study investigates the correlation between the proposed algorithm's outcomes and results obtained through EIS and GITT methods.
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Lithium-ion battery SOH analysis
Sedlařík, Marek ; Kazda, Tomáš ; Vyroubal, Petr
Battery State-of-Health modelling can significantly reduce the amount of costly laboratory tests in the application being analyzed. This paper discusses the prediction of the State-of-Health, an indicator of battery life, using support vector regression. This experiment is performed on a sample cell of a lithium-ion battery, which is subjected to a method known as the Constant Current Constant Voltage method, where the battery is charged and discharged at a constant current of 0.5 C. Although this method in this paper is applied in laboratory conditions and it is a controlled method, or it deviates from the battery cycling of real applications, it can be used in these applications, thus the scope of this research can predict the State-of-Health also in the areas of batteries used in mobile devices or electromobility. The State-of-Health indicator then determines whether the battery is still suitable for that primary application. Assuming that we can predict this parameter with some accuracy, it is then also possible to tell after what length of time a battery will need to be replaced and when it will be suitable for secondary applications such as stationary storage. Once it reaches that state, this calculation can be further applied to those applications as well.
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Indoor localization based on UWB technology
Bauer, Jan Jiří ; Vyroubal, Petr (referee) ; Čech, Ondřej (advisor)
This bachelor thesis is exploring ways to localize an object in space, primarily using UWB technology. Diverse ways to determine distance (TWR, RSSI, TDoA), location in space (triangulation, multilateration, particle filter), and filters (LSM, Kalmann filter) are explained. Using development board ESP-32 UWP Pro localization system is realized, using TWR and particle filter. This system was calibrated and tested in a real environment.
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Device for galvanic plating of 3D printed parts
Orgoň, Sebastián ; Starý, Jiří (referee) ; Vyroubal, Petr (advisor)
This work aims to bring closer the process of galvanic plating of 3D prints, it is dedicated to individual parts of 3D printing where we go through different types of printing and materials. Also points out the importance of pre-treatments before galvanic plating and discusses the individual options for these pre-treatments. It also deals with galvanic plating itself, where it analyzes the principle of this technology of thin layer deposition and differentiates between the individual types of possible coatings used. At the same time, it deals with the parameters affecting this process and the quality of the applied layer. It also deals with the concept of the complex device for such galvanic plating and its implementation. At the end, through a series of experiments, searches for the optimal setting of the parameters for the plating process.
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Design of control electronics for an robotic lawnmower
Tichý, Dominik ; Sedlařík, Marek (referee) ; Vyroubal, Petr (advisor)
This work deals with the issue of IoT and the smart devices used in it. The work is further devoted to Robots, with a great emphasis on mobile robots. It discusses the types of chassis and the types of guidance in space using both classical and heuristic methods. The work also discusses the methodology of the design of electrical devices in practice. The design of the intelligent mower and its individual blocks is described in the next part. Following that, it moves on to the implementation itself, where the individual steps of implementation are described. The last part is dedicated to programming and testing individual mower functions.
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Robotic manipulator control
Černík, Filip ; Sedlařík, Marek (referee) ; Vyroubal, Petr (advisor)
The work deals with familization of the project called BCN3D-Moveo. What is it and how it works. The project can be divided into three parts: structural, electronic and control part. The construction part includes familiarization with robotic arm structures and obtaining its 3D model for consequential 3D printing and assembly. The electronic part deals with the selection adn connection of the appropriate electronics, for the proper functioning of the robotic arms and. The last control part includes the issue of controlling the entire robotic arm and introduces the control of stepper motors.
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Device for measuring tensile tests of 3D printed materials
Besta, Pavel ; Binar, Tomáš (referee) ; Vyroubal, Petr (advisor)
This thesis deals with the problematics of 3D printed materials, specifically with FDM and SLA methods of 3D printing and their reliability when it comes to tensile strength. After comes introduction of materials used in FDM and SLA 3D printing and description of how certain printing parameters affect the final mechanical properties of 3D printed parts. Last theoretical part of this thesis deals with tensile tests and the means of getting deformation curves out of these tests. In the practical part of this thesis is described the design of electronics for a device for measuring tensile tests provided by the institute of electrotechnology. Part of this thesis is also a detailed guide on how to perform and evaluate tensile tests and measured mechanical properties of some materials.
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Construction of a small portable 3D printer
Netušil, Jan ; Vyroubal, Petr (referee) ; Bayer, Robert (advisor)
The study is dedicated to the description of 3D FDM printing technology, compares different types of 3D FDM printers and analyzes key components, especially those necessary for a stable portable 3D printer design. It also includes the specific design of the portable 3D FDM printer solution, its assembly, the actual enhancement of the design, and the design and implementation of the braking arresting elements. It also addresses the printing testing of advanced construction materials suitable for 3D FDM printing and provides a cost estimation and evaluation of the cost-effectiveness of building a portable 3D FDM printer.
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Evaluation of the quality of 3D scanned objects
Paštěka, Marek ; Jaššo, Kamil (referee) ; Vyroubal, Petr (advisor)
This thesis deals with problematics of trasfering real life objects into digital data using 3D scanners. Thesis deals with various 3D scanning technologies and errors of these methods. Main part of this thesis deals with special situations, during which a topology defect may likely occur. These defects most often seriously impact the resulting model in a negative way. For the purpose of maximally describing the issue at hand some very extreme edge scenarios were chosen for these experiments. Thesis also deals with development of a turntable device based on an Arduino microcontroller to help in the process of 3D scanning.
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Increased suction speed of the fire pump using CAE
Hluší, Martin ; Maxa, Jiří (referee) ; Vyroubal, Petr (advisor)
This thesis adresses the issue of designing a new system for flooding the centrifugal pump equipped in the PS-12 type motorized fire pump. Initially the fire attack as a sport and the motorized fire pump PS-12 with the gas vakuum pump are described. Then the problem, this thesis adresses, is covered. The next chapters describe the Computer-aided engineering method and fluid flow with regards to flow through nozzles. Practical part of this thesis starts with simulations of the current gas vakuum pump equiped on the PS-12 pump. The design process of the new flooding system is described next and simulations as well as testing of the constructed prototype are used to validate its function.
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