Conference papers (RICE)
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Item Magnetic Actuation of Miniature Robots on Planar Surfaces: Mathematical Modeling and Estimation(University of West Bohemia, 2022) Koua, Kadio Ettien Jean; Mach, FrantišekMagnetic actuation methods in miniature robots are widely used thanks to their wide applications for precise micro-manipulations in inaccessible or hardly accessible environments, including medical and biological operations. The system studied is composed of miniature robots with permanent magnets inside the body and a planar coplanar coils actuator. This paper investigates the mathematical modeling of a robot's movement, taking uncertainties and unmodeled dynamics into account. The crucial parameter is the friction coefficient between the planar actuator and the robot as it moves. An approach has been proposed to estimateit using the Kalman filter principle. Numerical simulations are compared to experiments to illustrate the effectiveness of the proposed approach.
Item Optimisation of PV system energyefficiency with take into account technical conditions(Instytut vidnovliuvanoyi enerhetyky NANU, 2024) Bělík, Milan; Rubanenko, Olena; Rubanenko, O.; Klochkov, A.This paper considers the rates of increase in the installed capacity of photovoltaic systems in Ukraine and in the world according to the International Renewable Energy Agency (IRENA) and nternational Energy Agency (IEA). A comparative analysis of the technical characteristics of monocrystalline photovoltaic modules operated in the Czech Republic and Ukraine under similar meteorological conditions is presented. Possible reasons for the decrease in the energy efficiency of photovoltaic modules and ways to solve them are onsidered. It is established that biological corrosion reduces the energy efficiency of the photovoltaic module and initiate the development of other defects.Item Numerická analýza olejového transformátoru plněného biodegradabilním olejem(TechSoft Engineering, spol. s r.o., 2024) Sobotka, Lukáš; Leffler, JanV současné době je společností vyvíjen tlak na udržitelnost a ekologičnost jednotlivých zařízení. Z tohoto důvodu v minulosti vznikly některé Evropské direktivy, cílící na zvýšení účinnosti, v tomto případě účinnosti transformátorů. Tento článek popisuje numerický model chlazení takto navrženého transformátoru navíc chlazeného přírodním esterem ENVITRAFOL.Item Fast Earth-Fault and Feeder Detection in Medium-Voltage Distribution Power Grids(IEEE, 2023) Štengl, Josef; Komrska, Tomáš; Peroutka, ZdeněkSafety and reliability of medium-voltage distribution power grids depend on the rapid detection and elimination of faults. The most common faults in MV power grids are single-phase earth faults. Traditional methods for faulty feeder detection are not fully reliable and their sensitivity must be increased by connecting of an auxiliary resistor, which cancels the compensation of the fault current. Simple, fast, and reliable algorithms for both, earth fault and faulty feeder detection in MV distribution power grids are proposed in this paper. The methods are based on computation of angle between feeder currents using a dot product, they are computationally efficient and eligible for real-time environment. Their performance is verified on the set of 154 earth fault records, measured in a MV distribution power grid of 22 kV.Item Dynamic Wireless Charging Using LCC-S compensation topology in Low and Medium Power Applications(IEEE, 2023) Zavřel, Martin; Kindl, Vladimír; Tyrpekl, MiroslavWireless power transfer in battery charging mode or in direct supplying mode is high actual theme of these days. Dynamic wireless power transfer as charger or supply is highly cited especially in electro mobility nevertheless, it has also place in another applications as autonomous transfer systems, linear tracks, more axis linear tracks, linear tracks for robot’s act., where a receiver size is set by application. To ensure high charging line modularity and the technology grasp in the automation area, an adequately small receiver is required. A Dynamic wireless charging is specific by large number of transceivers stored behind each other in the charging line – called segmented dynamic wireless charging. In presented paper, the theoretical background, simulation analysis and laboratory testing results is providing out to optimize charging line for automation applications. The key considered means of achieving satisfactory results are segment grouping in transceiver charging line and wireless power transfer compensating topology. Results are summarized to the optimal grouped segmented dynamic wireless power transfer system design.Item Control strategy for simulator moving platform with enhanced reliability(University of West Bohemia, 2023) Kehl, Zdeněk; Glasberger, Tomáš; Glasbergerová, VendulaThe primary objective of this paper is to design a control system for an indirect frequency converter for a linear actuator employed in a 6DOF moving platform, which finds utility in simulating vehicles, aircraft, and drivers' or pilots' training. To achieve the desired performance, the proposed control strategy for the indirect frequency converter aims to accomplish two crucial goals. Firstly, it must ensure a highly responsive actuator with exceptional dynamic characteristics. Secondly, it must establish appropriate electromagnetic compatibility with the grid and the possibility of energy recuperation. Considering that the simulator is intended to be used in collaboration with a training crew, it becomes paramount to prioritize the reliability and safety of its operation. However, ensuring the reliability of the linear actuator's winding (slider) position sensor, which can be particularly challenging in this context, is crucial. As a solution, the control algorithm of the converter's output section has been extended to incorporate sensorless position and velocity estimation. This addition addresses the challenge of the position sensor mechanical installation and enhances the system's overall reliability. Selected experimental tests proved the proposed converter control system.Item Increasing Operation Flexibility of Backpressure Turbine in Cogeneration Plant by TES: Case Study(University of West Bohemia, 2023) Hromádka, Aleš; Vinš, MartinThere is proposed an idea and evaluated a case study of cooperation of thermal energy storage (TES) and backpressure turbine in this paper. The main focus is paid on separation of the link between production and utilization of thermal energy as well as electrical energy by backpressure turbine. An overview of the thermal energy storages was elaborated, and optimal storage was evaluated on real operation data from combined heat and power plant as a case study. Case study results are discussed in the conclusion.Item Digital Transformation of Electrical Engineering Companies in the Czech Republic(Springer Cham, 2024) Benešová, Andrea; Steiner, František; Tupa, JiříCompetitive yet sustainable production will be a real challenge for companies, especially in the current market conditions that have been affected by the covid-19 pandemic. In the future, if companies want to stay in the market and be competitive, they will have to adapt their production to requirements such as the Industry 4.0 concept, one of the benefits of which is to increase the productivity of companies and a relatively fast return on investment. For this reason, the main objective of this paper is to find out the current status of enterprises in the electrical manufacturing sector in terms of implementing the Industry 4.0 concept. The findings were made through a questionnaire survey in which 50 companies from this sector participated. Surprisingly, the results of this survey showed that more than half of the respondents, despite all the possible benefits of the Industry 4.0 concept, are still not planning to implement it, while the remaining respondents are already in various stages of implementation. Moreover, although the Industry 4.0 concept has been discussed since 2011, the data showed that 20% of respondents are not familiar with the concept. The respondents who answered this way belonged to the group of micro or small enterprises, where this is understandable.Item SMD Components Recycling Procedure for Reuse in E-Textiles with Risk Analysis(Springer Cham, 2024) Hirman, Martin; Benešová, Andrea; Navrátil, Jiří; Steiner, František; Tupa, JiříThis paper deals remanufacturing method for the reuse of adhesive bonded SMD components on stretchable textile ribbons for integration in e-textiles and its risk analysis. Nowadays, e-waste is an increasing problem in the world, and reducing this problem by using circular economy principles and reusing components is beneficial. In our research, the samples were submitted for accelerated ageing by dry heat and their quality was evaluated by the electrical resistance measurement. The recycling procedure was realized four times, and the mentioned risk analysis was realized before and after the experiment. The two main goals of our research were determined. The first goal was to demonstrate the applicability of our recycling procedure and the quality of samples with reused components after accelerated climatic ageing by dry heat. The second goal was to create and verify the risk analysis of our method and identify actions to mitigate the high and very high risks. The experiment showed that our recycling method is applicable several times without decreasing product quality. The results also present that reused samples are functional like new even after samples dry heat ageing. The risk analysis after the experiment showed seven high risks, which is necessary to solve primarily. These risk factors and actions to mitigate them are described in the paper.Item Vliv numerické metody na Analyticko-numerický tepelný model synchronního stroje s permanentními magnety a proměnným zatěžovacím cyklem(Západočeská univerzita v Plzni, 2023) Sobotka, Lukáš; Skalický, MartinČlánek se zaměřuje na tepelné modelování synchronního stroje. Tepelný model využívá analyticko-numerickou metodu řešení tepelných jevů. Tento článek ukáže vliv počtu cyklů a použité numerické metody na přesnost řešení. Stroj bude zatížen jednoduchým pracovním cyklem.Item Redundantní struktury v integrovaných obvodech FPGA v prostředí ionizujícího záření(Západočeská univerzita v Plzni, 2023) Růžička, OndřejSpolehlivost obvodů FPGA v prostředí ionizujícího záření je důležitá především pro kritické aplikace a výzkum v prostředí se zvýšenou radiací. Jedním ze způsobů zvýšení spolehlivosti návrhů je použití redundantních struktur. Práce se zabývá vývojem měřící platformy pro radiační testování hradlových polí PolarFire MPF300T. Poté návrhem, realizací a měřením kombinační logiky s modulární redundancí. Jako užitečná logika je popsána plná sčítačka. Pro zvýšení spolehlivosti je použita lichá modulární redundance. V závěrečné sekci jsou nasbíraná data vyhodnocena a formulována možná vylepšení pro budoucí experimenty.Item Vliv stárnutí na mechanickou pevnost samoléčitelného karboxylovaného nitrilkaučuku(Západočeská univerzita v Plzni, 2023) Rychlík, Zdeněk; Prosr, Pavel; Polanský, RadekTento článek pojednává o vlivu stárnutí na mechanickou pevnost samoléčitelného karboxylovaného nitrilkaučuku. Studie se zaměřuje na analýzu změn mechanické pevnosti po různých dobách expozice stárnutí.Item Diagnostika synchronních generátorů(Západočeská univerzita v Plzni, 2023) Rozhon, OndřejČlánek se zaměřuje na budoucí výzkum diagnostiky synchronních generátorů během doktorandského studia. Konkrétně se zaměřuje na diagnostiku mezizávitových zkratů a diagnostiku bezkroužkového budiče synchronního generátoru. Meziobvodový zkrat bude detekován pomocí magnetické sondy a výsledky by měly přesně určit místo zkratu. Na druhou stranu diagnostika bezkroužkového budiče by měla identifikovat diodu, která je zodpovědná za poruchu ve výkonovém budiči. Dále budou obě metody vyhodnoceny pomocí strojového učení.Item Reliability Testing of Recycled SMD Components Reused in E-Textiles after Ageing by Washing Cycles(IEEE, 2023) Hirman, Martin; Navrátil, Jiří; Benešová, Andrea; Steiner, FrantišekThis paper presents a method for recycling and reusing SMD chip components in e-textiles using a special contacting technique. The method involves using a UV-curable, non-conductive acrylic adhesive to connect SMD components onto electrically conductive textile stretchable ribbons. At the end of the product’s life-cycle, the components are removed from the ribbon and reused to manufacture new products. The recycling procedure involves several steps, including disassembly, inspection, cleaning, repair, and reassembly of components. The results of an experiment testing the electrical resistance of new and reused components after washing and drying cycles showed that electrical resistance of reused joints did not significantly deteriorate compared to new joints. The reused components maintain their functionality and performance, suffering no significant impairment. They perform comparably to new components, even after repeated washing and drying cycles. The method offers several benefits, including conservation of raw materials, minimization of waste,and reduction of production costs. It can also help mitigate component shortages. However, it is found that the suitability of this remanufacturing method varies with different types of components. Certain component types may be more susceptible to damage or even unsuitable for this method. The method is particularly beneficial for higher-value or components experiencing market shortages, demonstrating its potential to address urgent industry challenges while contributing to environmental sustainability.Item Testing of electromigration resistance of copper and silver thick films(IEEE, 2023) Hlína, Jiří; Řeboun, Jan; Šimonovský, Marek; Hamáček, AlešThis paper is focused on the electromigration resistance of copper and silver thick films. Electromigration was tested by water drop test. Four common conductive thick film pastes were used for testing – silver paste with low platinum content, and two silver pastes with different content of palladium and copper paste. Electromigration was tested under voltage of 6 and 12 V and time to shortcut was measured. Results of testing including the comparison of electromigration resistance depending on thick film paste type and different electrode spacing are described in this paper.Item Bi-Directional Converter Prototype for Second-Life Battery Energy Storage System(IEEE, 2023) Valenta, Pavel; Zich, Jan; Kulhánek, Tomáš; Jandík, JanThe electrification in transport is a global trend. Due this the number of the batteries for the electric vehicles (EV) is increasing worldwide. The batteries that have reached the end of their primary life in EV have still a residual capacity. Next use for these batteries, known as second life, is the energy storage systems. An integral part of these applications are power convertors that act as an interface between the batteries and the energy grid. This contribution presents the Buck-Boost converter prototype with power rating up to 30 kW. The Input voltage range (battery side) is from 400 V to 700 V and the nominal output voltage is SOO V. The converter prototype is developed for Second-Life Battery Energy Storage System (SLBESS) applications.Item Topology of Battery Management System for Second Life Battery Energy Storage System(IEEE, 2023) Kulhánek, Tomáš; Novotný, Jakub; Valenta, PavelWith the growing development of electromobility, the number of manufactured batteries is also increasing, which will eventually need to be recycled. One of the recycling options is to use worn but still functional batteries in energy storage systems, giving them a second life. Each battery assembly requires a Battery Management System (BMS) for proper and safe operation. For recycled cells, the BMS system is more complex due to significant differences in wear and, consequently, in parameters between the cells. Therefore, active balancing of each cell in the assembly is necessary in such a configuration. Additionally, increased safety measures must be taken for such an assembly.Item Thermal model of the Second-life Battery Energy Storage System as a building block for digital twin(IEEE, 2023) Novotný, Jakub; Kulhánek, Tomáš; Zich, JanA Second-life Battery Storage Systems are a promising direction of how to optimize costs in modern smart grids. although they may help to reduce costs, they represents very sensitive components which imposes a high demands on their design and control.A promising direction is so called “digital twin” approach where particular sub-systems are designed and optimized in a simulations or co-simulations without the need to invest in to the real hardware. Such mathematical models are usually quite complex due to highly nonlinear nature of the system and they require a high degree of understanding of the problem to successfully implement them.In this paper we deal with the design of thermal mathematical description of the battery storage system as a building block of the overall mathematical model. Specifically we focus on simple implementation and low complexity while achieving sufficient precision of the model. Proposed model was verified in simulations using real measured dataItem Vliv drsnosti a povrchové úpravy na mechanickou pevnost pájecích spojů(Západočeská univerzita v Plzni, 2023) Rous, Pavel; Steiner, FrantišekTato studie zkoumá mechanickou pevnost pájecích spojů a zkoumá vliv povrchových úprav, pájecích materiálů a tepelného stárnutí. Pomocí metody DOE byly testovány vzorky s pájkou SAC305 a SN100C a různými povrchovými úpravami. Výsledky ukázaly, že nejvyšší mechanickou pevnost poskytuje galvanicky pokovený nikl, zatímco tepelné stárnutí snižuje celkové špičkové zatížení. Studie rovněž zjistila menší křehkost intermetalických sloučenin vytvořených s galvanicky pokoveným niklem. Tato zjištění nabízejí pohled na optimalizaci spolehlivosti pájecích spojů v elektronických zařízeních.Item Testování a kontaktování pružných uhlíkových nití vhodných pro nositelné senzory natažení(Západočeská univerzita v Plzni, 2023) Radouchová, Michaela; Janda, Martin; Blecha, TomášPříspěvek je zaměřen na testování a propojování pružných uhlíkových nití. Cílem této práce je otestovat odolnost uhlíkových nití, ověřit el. změny odolnosti během cyklického natahování a vytvořit lehké, tenké a uživatelsky přívětivé propojení uhlíkové nitě pro chytré textilní aplikace s využitím lepení nebo ultrazvukového svařování plastů.
