People
Ing. Jindřich Sadil, Ph.D.

2024, Infrastructures - Open Access Journal, 9 (1), ISSN 2412-3811

We present a comprehensive methodology for a two-step approach to address the task at hand. The first step involves the optimal placement of charging stations, while the second step focuses on determining the necessary capacity of the charging stations based on traffic factors. This methodology is applicable to countries, states, or specific areas where the placement and optimization of charging stations for truck road transport are being considered. We identify the key inputs required for solving such a task. In the results section, we demonstrate the outcomes using a model example for the Czech Republic.

2024, Monatshefte für Chemie - Chemical Monthly, 155 (3-4), p. 227-232), ISSN 0026-9247

Electrochemical impedance spectroscopy (EIS) is a measurement method widely used for non-destructive analysis and diagnostics in various electrochemical fields. From the measured dependence of the battery impedance on the frequency, it is possible to determine the parameters of various equivalent electrical circuit models of the battery. The conventional method of battery measurement using single-sine EIS is currently one of the most widely used methods for the analysis of lithium-ion batteries. However, its most significant disadvantage is the relatively long measurement time. For this reason, there is a growing demand for faster methods using fast-Fourier transform or pseudo-random sequences. A description of various EIS methods applications is provided in this paper.

2023, Proceedings of the ABAF 24th Conference, Brno, VUT v Brně, FEKT), p. 55-56), ISBN 978-80-214-6176-5

Electrochemical impedance spectroscopy (EIS) is a measurement method widely used for non-destructive analysis and diagnostics in various electrochemical fields. From the measured dependence of the battery impedance on the frequency, it is possible to determine the parameters of various Equivalent Electrical Circuit models of the battery. The conventional method of battery measurement using single-sine EIS is currently one of the most widely used methods for the analysis of Lithium-ion batteries. However, its most significant disadvantage is the relatively long measurement time. For this reason, there is a growing demand for faster methods using Fast-Fourier Transform or Pseudo-Random Sequences. A description of various EIS methods’ applications is provided in this paper.

2022, Batteries, 8 (12), ISSN 2313-0105

In this paper, capacity fade of LiFeYPO4/graphite commercial cells during 116 cycles under different temperatures is studied. The cells were discharged in two modes, during Drive Cycle (DrC) discharge cycles the cell was discharged with current waveform calculated for example battery electric vehicle (BEV) under WLTC 3b drive cycle conditions, whereas during Constant Current (CC) discharge cycles the cell was discharged with a constant current of the same root mean square of the current, as the WLTC 3b current waveform and with the same depth of discharge. All the cells were charged in constant current/constant voltage mode. Two fresh cells were used for each discharge mode at 25 °C and as the results were similar, only one cell per discharge mode was used at the other temperatures 5 °C and 45 °C. Furthermore, simulation P2D model of calendar and cycle life was calibrated based on experimental data. SoC floating was observed during cycling for both discharge modes, accompanied with slight increase in end discharge voltage and growth of energy efficiency. Concluding the results for 25 °C, not waveform character, but the amount of electric charge in combination with calendar aging has the most effect on the cycle life, which is also proved by the simulation. For 5 °C, the capacity fade is milder for DrC discharge cycles, but simulation results do not prove that, which would demand further investigation. The results for 45 °C are apparently dependent on a higher amount of discharged and charged electric charge and influenced by calendar life, simulated capacity fade corresponds quite well to the experiment. The best State of Health (SoH) simulation results are for temperature 45 °C, RMSE is 0.10% SoH, for the other temperatures RMSE is 0.20 and 0.93% SoH for 25 and 5 °C, respectively.

2021, International Scientific Conference "Horizons of Railway Transport 2020", Elsevier B.V. on behalf of Cairo University), p. 289-304), ISSN 2352-1457

The paper deals with electric charging concept for road freight transport and discusses various kinds of charging stations and their categorization with respect to the connection to a vehicle and type of voltage, fundamental aspects of the design of the electric vehicle charging infrastructure and connection options to the distribution system. The issue of noise, landscape fragmentation and the barrier effect of roads and highways, and emphasizes the influence of freight transport on air pollution, in particular its significant contribution to the production of nitrogen oxides, hydrocarbons, sulfur dioxide, dust particles and other pollutants are mentioned in the paper. A special attention is paid to emissions of carbon dioxide, a significant greenhouse gas, again in the context of freight transport. The methodologies of Well to Wheels (WTW) and Life Cycle Assessment (LCA) are also presented in the paper.

2021, Proceedings of the “Transport Means 2021”, Kaunas, Kaunas University of Technology), p. 1047-1053), ISSN 1822-296X

The article presented here discusses the possibility of use of alternative sources of energy in road freight transport. It deals with emissions from road freight transport and their modelling including the description of emission models, it further introduces a simulation model for fuel consumption and emission calculation, the process of design of optimization of a network charging stations and a concept of charging stations and hydrogen power. The aim is to determine a proper way of implementing alternative energy sources (AES) in freight road transport, to create a simulation model for fuel consumption and emission calculation and therefore to compare the impact of different types of alternative fuels on the environment and to assess emissions in a broader cycle. The work further aims at proposing a method of optimization of a network of charging stations and discussing the concept of charging stations and hydrogen power.

2019

Technická zpráva popisující koncepci technického návrhu prototypu efektivního prodlužovače dojezdu pro hromadné dopravní prostředky.

2017, ISBN 978-80-270-1554-2

The brain is a supersystem. Thalamocortical reverberation system (TCRS) and its cognitive abilities are chosen for an experiment. Analogies of psychology of learning and model developed for visualization of energy function of artificial neural networs are presented in the book. Influence of different applied noise levels to the process of learning is analysed and evaluated.

2017, Elektro, 2017 (10), p. 11-16), ISSN 1210-0889

Článek se zabývá popisem elektrochemické impedanční spektroskopie (EIS), moderní zkušební metody testování akumulátorů. Metoda EIS je stručně uvedena a je popsáno její využití pro stanovení parametrů náhradních obvodových modelů akumulátorů. Dále je popsáno zavedení metody EIS na ČVUT FD a provedený experiment. Cílem experimentu bylo porovnat výsledky EIS nového a opotřebeného akumulátoru technologie LiFeYPO4 o kapacitě Cn = 90 Ah. Z naměřených hodnot byly vyhodnoceny závislosti jednotlivých osmi parametrů na stavu nabití SOC. Výsledky prokazují silný vliv opotřebení akumulátoru na parametry náhradního modelu.

2017

Tento dokument vznikl na základě smlouvy o zajištění služeb č. O. ODB2015429 a zabývá se vyhodnocením provozu lokomotivy 714-811 v období 1. 1. až 31. 5. 2017. Je popsán provoz lokomotivy a vyhodnocen provoz na vlečce VD ve sledovaném období.