Lidé na fakultě
prof. Ing. Dušan Maga, Ph.D.

2024, 2024 21st International Conference on Mechatronics - Mechatronika (ME), New Jersey, IEEE), p. 72-77), ISBN 979-8-3503-9490-0

Today, energy management systems represent a cornerstone of every embedded system, especially in IoT devices, which have become a fundamental part of our lives in this digitalized world. Many researchers have focused on using EMS to conserve energy and extend the lifetime of IoT devices. We chose a different approach to provide more energy, thereby prolonging the operational lifetime of IoT devices and enhancing their QoS parameters. This approach is based on providing an energy-aware management system that adapts the QoS based on a machine learning model predicting the available solar energy hourly, which led to extending the operational lifetime of the IoT device by approximately 300 %, the QoS in terms of active duty cycle by 400 %, and transmission power strength by 200 %.

Stať ve sborníku z prestižní konf.

2024, ISBN 979-8-3503-9490-0

Sborník z mezinár. konf.

2022, Sustainability — Open Access Journal, 14 (24), ISSN 2071-1050

In this article, we deal with the problem of Hybrid Energy Harvesting control strategies, while paying attention to their properties and suggesting criteria to assess their suitability for specific energy harvesting techniques, as well as their application in different areas of technology—especially Wireless Sensor Networks and the Internet of Things. Many research works have already been published on the topic of combining resources for Energy Harvesting; nevertheless, a comprehensive review of the control strategies for such systems and a comparison of their most important properties is missing. This is the genesis and the main subject of this article. We have performed a deep research investigation of available resources. We have identified eight different control strategies and defined a set of the most important parameters (including their possible ranges/states) as criteria to be able to compare them. The corresponding sections of this article begin with a general description of the respective strategies and their principles (including generalized schemes), which is followed by specific examples of best practices. The key conclusions of the performed analysis are summarized in a comparison table that allows the readers to make their own conclusions and choices.

Článek v periodiku excerpovaném SCI Expanded

2022, 2022 20th International Conference on Mechatronics - Mechatronika (ME), New York, IEEE Press), p. 163-166), ISBN 978-1-6654-1039-7

Nowadays, increasing the demand for data and the complexity of wireless sensor network hardware lead to an increase in the energy consumption of the respective devices. Using a huge number of WSN nodes is required to provide sufficient data to meet the requirements of modern applications. Energy harvesting systems are an ideal response to the rise in energy prices and costs of maintenance, but using a single energy harvester is insufficient because of the discrete nature of renewable energy resources and the high demand for energy in modern IoT systems. The solution is to harvest energy from several different resources to provide for a continuous energy source. In this paper, we introduce a new design of a platform for harvesting and combining energy from different renewable energy resources and storing it in a device equipped with battery management system to provide information about the current state of charge.

Stať ve sborníku z prestižní konf.

2022, ISBN 978-1-6654-1040-3

Sborník z mezinár. konf.

2021, Energies, 14 (17), ISSN 1996-1073

Increasing the efficiency of the solar energy harvesting system is an urgent need in light of the climate changes we live in nowadays. The most significant data to be processed in the photovoltaic harvesters are the curve of solar radiation intensity to achieve the maximum benefits of the solar incident light. This processing contains complicated procedures, and the used algorithms are also high computational power-consuming which makes using special software and high potential hardware essential requirements. An explanation of the Minimum Energy Effect method is presented in this article. Our proposed algorithm uses this method to provide a simple and high-accuracy mathematical tool for generating a simple alternative curve instead of the complicated original nonlinear curve of solar radiation intensity. The produced curve is suitable for further operations, such as derivatives, integrals, or even simple addition/subtraction. Our algorithm provides a gradual procedure to find an optimum solution of the equation system, unlike the iterative methods. In addition, the results of analyzing the effect of time-division density showed the relationship between the speed of solving the task and the accuracy of results.

Článek v periodiku excerpovaném SCI Expanded

2021, ISBN 978-1-7281-9327-4, ISSN 2472-7687

Sborník z mezinár. konf.

2020, 2020 19th International Conference on Mechatronics - Mechatronika (ME), Piscataway (New Jersey), IEEE), p. 211-214), ISBN 978-1-7281-5602-6

The paper describes the vibration laboratory stand solution, developed and realized by authors. The stand is used to reduce the influence of the environment on the measured system, so only required vibration sources are present (and captured). The stand itself is presented in the paper, as well as its finite element analysis. These are followed by an initial set of measurements, including the description of the used hardware and settings.

Stať ve sborníku z prestižní konf.

2020, ISBN 978-1-7281-5602-6

Sborník z mezinár. konf.

2019, ISBN 978-1-7281-0289-4

Sborník z mezinár. konf.

2018, SUSTAINABILITY, 10 (3), ISSN 2071-1050

The efficient utilization of energy sources seems to be one of the most challenging problems for designers and scientists alike. This challenge particularly applies to power electronics, where the increasing value of energy density leads to demands for optimization processes and better exploitation (and distribution) of available power sources. As a result, the implementation of frequency-controlled systems is more often in the spotlight. The systems with doubly fed induction machines and a frequency converter in the rotor circuit are typical representatives of these demands. In a wide spectrum of power electronic systems, frequency converters are often used that have a constant current, a diode rectifier, and a thyristor inverter. This article provides a novel approach to modeling methodology, and presents a unique comparison of four different frequency converter schemes that are connected to a doubly fed induction machine. This article presents the modeling methodology itself, as well as the results based on an asynchronous generator motor fed by different frequency converters, a spectral analysis of the output voltage of the used frequency converters, and a comparison of the different technologies. Based on the above, this paper recommends the use of a multistage-multilevel frequency converter scheme.

Článek v periodiku excerpovaném SCI Expanded

2018, Proceedings of the 2018 18th International Conference on Mechatronics - Mechatronika (ME) 2018, Brno, Brno University of Technology, Faculty of Mechanical Engineering), p. 397-402), ISBN 978-80-214-5544-3

Extending the lifetime of the wireless sensor node is a critical issue facing the developing of the wireless sensor networks. One of the solutions is employing the energy harvesting technologies to collect renewable energy from the ambient environment. For indoor Wireless Sensor Network (WSN) applications, the chosen of the energy harvester is based on the requirements of the application and the environment. Our application will be used in offices and hospitals so using a noiseless technology is required. So, the photovoltaic energy is the best solution which matches the requirements. In this paper, we will present the design of the photovoltaic energy harvesting system with mathematical modeling and the results of the real experiments.

Stať ve sborníku z prestižní konf.

2018, Recent Technological and Scientific Advances, Springer, Cham), p. 302-310), ISBN 978-3-319-65959-6, ISSN 2194-5357

The goal of the research is to improve the technical characteristics of the mecha-tronic system consisting of electric power turbo-generator of two different fre-quencies - an increased frequency of 200 Hz and an industrial frequency of 50 (60) Hz - at a rotor speed of 628 rad/s (6,000 rpm) equal to the turbine rotation frequency, complete with matrix frequency converter (MFC), included in the cir-cuit of a three-phase winding of an additional part of the rotor. The article describes the device and the operating principle of the mechatronic system under consideration. The obtained analytical relationships allow to deter-mine the calculated full power of the MFC and to calculate the harmonic compo-nent of the generated electric power of the industrial frequency.

Stať ve sborníku z prestižní konf.

2018, ISBN 978-80-214-5542-9

Sborník z mezinár. konf. cizojazyčně

2018, Proceedings of the International Conference on New Trends in Signal Processing, Liptovský Mikuláš, Akadémia ozbrojených síl), p. 134-141), ISBN 978-80-8040-547-2, ISSN 1339-1445

The paper gives an overview of Wireless Sensor Networks (WSN) from the viewpoint of energy consumption focused on the network security. The security issues are nowadays significant for all wireless (and wired as well) networks; however, in wireless sensors, limitations of the available energy have to be taken into account. Therefore, the network managers/designers have to decide whether a secure communication in the system required or not. The major part of the paper is in presenting the energy consumption model implemented in Matlab/Simulink environment to evaluate the energy requirements of each considerable security solution compared to opened (means nonsecure) system.

Stať ve sborníku z prestižní konf.

2018, ISBN 978-3-903176-03-4, ISSN 2163-4033

Sborník z mezinár. konf.

2017, Recent Global Research and Education: Technological Challenges, Cham, Springer), p. 459-465), ISBN 978-3-319-46489-3, ISSN 2194-5357

An international project realized by 9 partners from 4 EU countries (CZ, ES, SK, DE) will be introduced in the paper. The main objective of the project is to increase the quality of education at schools using a form that will be highly attractive. Topics are based on 20 different subjects (telecommunications, electronics, automation and related areas). The following types of new-generation learning objects have been developed for students and teachers: explanatory modules, worksheets, tests, explanatory dictionary, and multimedia translation dictionary. These learning objects are described in the paper. Also the quality management of a large international team, as well as the social impact and expectations will be discussed.

Stať ve sborníku z prestižní konf.