The research presented in this paper involves the design of a power control system for a hydrokinetic turbine previously tested in real operating conditions. A maximum power point tracking (MPPT) algorithm was designed and simulated using the required parameters for a specific electric generator. The proposed system consists of a generator connected to the hydrokinetic turbine, a three-phase uncontrolled rectifier, a direct current (DC) boost converter with MPPT control to extract maximum available power, and a buck converter to control the amount of power delivered to the load. In order to test the MPPT algorithm, we built the individual blocks on the basis of the corresponding equations of each component. The algorithm considered the specific parameters of the previously tested turbine as input data and simulated the same water velocities for which the turbine had been tested. Thus, the simulation predicted a power output of 105 W for a water velocity of 1.33 m/s, 60 W for 1 m/s, and 30 W for 0.83 m/s. The efficiency of the control system was demonstrated when the instantaneous power value was maintained at a maximum point, regardless of the rotational speed according to the experimental power curves of the driving rotor obtained for certain water velocities.

This document comprehensively analyses the literature on accelerometers used in monitoring systems designed for rail vehicle applications. It reviews the current research on this topic and highlights key findings, methodologies, and trends in the field. Additionally, it discusses the role of accelerometers in enhancing safety and performance within rail vehicle systems. This review is structured into several sections: Introduction, Fundamentals of Accelerometer Data, Signal-Processing Techniques, Examples of Accelerometers Used in Railway Monitoring Systems, and a Guide for Choosing the Right Accelerometer. One of the primary contributions of this paper is recommending the best accelerometer in terms of cost and performance for use in the rail vehicle industry. Future work will consider using an online detection tool for the acceleration of the frame of the railway coach and signalization of the peak values using the train intercom to the driver and static diagnosis systems. This approach aims to facilitate the detection of track irregularities, wind influence, and failures of the coach suspensions, which can be easily detected.

Mechanical antennas with rotating permanent magnets are a relatively new type of transmitting antenna in low- and ultralow-frequency (LF/ULF) ranges. The perspectives of the applications are encouraging, especially in the field of non-destructive defectoscopy and communications through conductive media (underwater communications), which is reflected in the articles published in the last decade. This article describes the experimental setup, results, harmonic analysis, and simulation validation for two configurations of mechanical antennas with rotating NdFeB permanent magnets. The emphasis is placed on the known analytical equations, specifically on the matching of the measurement results with the analytical data as well as with the results given by the numerical analysis. Also, several means of measurement are used to validate the results through replicate testing. Through analytical analysis and the performed measurement, this article establishes the basics for designing mechanical antennas with rotating permanent magnets for the considered configurations based on a single static magnetic field measurement. Finally, we explore prospects for future research in this domain as well as the advantages and disadvantages compared to other types of LF/ULF antennas.

This presentation refers to the realization and testing of an experimental model of AC drive system based on a 5-phase asynchronous motor, made in the power range of 3-6 kW, and on a dedicated electronic converter, developed to ensure the power of a light electric vehicle, powered by electric batteries.

This work is part of our larger research activity that has as its ultimate goal the experimental validation of the theoretical predictions regarding the electromagnetic shielding of conductive materials, in the frequency range 20 Hz–18 GHz. The present article deals with electromagnetic shielding in the range of 20 Hz to 80 MHz, i.e., in a near, magnetically generated field. For this frequency range, there is currently no normative document or in-depth research regarding the experimental validation of theoretical predictions, so the works published to date do not have an adequate degree of confidence. The paper presents the theoretical basis, i.e., the equations that describe the phenomenology of electromagnetic shielding, equations that are unanimously accepted in the scientific community in the field. The employed methodology and laboratory equipment that allowed obtaining the experimental results are also presented. The main component is an adapted zero gauss chamber with three concentric layers (two of Mu-metal and one of steel). The experimental results are compared with the theoretical ones for analytically calculable materials: copper, aluminum, Monel, and graphite. The agreement of these data validates the experimental method, which can then be used also for materials that are not analytically calculable, like composite materials, multilayer materials, or textiles.

This presentation concerns developing and testing an experimental model of a frequency converter based on IGBT transistors, controlled by a microcontroller, used to power a 5-phase asynchronous machine with a nominal power of 5 kW. The hardware implementation and the main elements of the control and diagnostic software, developed to ensure the control of a general-purpose converter, which can be used to drive a light electric vehicle powered by batteries, are presented. The measurements also include the behavior of the drive when a phase separation fault occurs.