Volumen 17 (2022): Edición 1 (October 2022)

Technical higher education - that is engineering education, unlike the general practice of secondary vocational education - already deals with adult “students”. Although the emphasis on educational tasks in universities is less, the attitude-shaping effect and example of lecturers play a key role. With this compilation, we aim to provide clues for this.

We discuss the possibility of solving the semidefinite optimization problem using interior-point algorithms. We present the primal and dual semidefinite programming problems, and then determine the interior-point condition and the optimality criteria. We analyze the central path system and the modification of this, using the method of algebraically equivalent transformation. We use the Nesterov-Todd scaling technique to obtain the proper search directions. We give a modified version of the Nesterov-Todd step interior-point algorithm based on the implementation point of view. We present some numerical results based on a code implemented in the Java programming language. We compare the results obtained for the identity map and the square root function within the framework of the algebraically equivalent transformation technique.

We study the algebraically equivalent transformation technique using an application implemented in the Java programming language that solves weighted linear complementarity problems. In general, in the case of the algebraically equivalent transformation, we divide the nonlinear equation of the system that characterizes the central path, the so-called centrality equation, by the barrier parameter. However, in this case, we divide, component-wise, the centrality equation by the right-hand side vector, which depends on the barrier parameter. We apply the same continuously differentiable and invertible function to both sides of the obtained equation and generate different search directions using Newton’s method. We analyze the numerical results provided by our application in the case of applying the algebraically equivalent transformation technique using the identical map and the square root function.

The electric vehicle drive is nowadays considerably widespread in everyday road transport. These vehicles have an important component: the electric motor. The motors are tested using a simulation program for which knowledge of its electromagnetic and dynamic parameters are needed. These data are usually not provided by the manufacturers; therefore, it must be determined experimentally by measurements. For this purpose, at the Faculty of Engineering of the University of Debrecen there is the structure of a complex measuring system in progress. With this system, we can determine the motor parameters required for the simulation for all electric motors used in the automotive industry. In this publication, we will present a method designed to produce one of the characteristic electromagnetic parameters of electric motors; the variable frequency and strength sinusoidal alternating current required to determine the inductance of windings.

In October 1908, a Ford Model T designed by József Galamb and companions, rolled out of the assembly line and achieved for the company a worldwide success it still enjoys today. The car’s ease of use and reliable construction, as well as its affordable price, won the favour of buyers so much that the model was produced until 1927. The increasingly successful Hungarian chief designer of the Ford Motor Company, József Galamb never forgot his homeland. When he returned home, he supported his brothers in building up and running a Ford site and assembly plant in Makó, and established scholarships, gave lectures to members of the professional community, and supported the Reformed Church in Makó.

Renewable energy is one of the best solutions for generating clean energy. Wind and solar installations have seen a huge increase in the last decades and will be the major power production technology in the future, phasing out classical power production such as coal and gas, which result in the increase of CO2 and other greenhouse gases. This article gives an overview on how grid connected renewable energy systems, like a photovoltaics, can play an important role in the energy supply of the future. Also it shows that such renewable energy sources need to be combined with storage in order to be able to comply with grid codes and make the energy system of the future clean and secure.

We have a decades-long tradition of examining the operation and maintenance issues of mechanical engineering systems at the Faculty of Engineering at the University of Debrecen. In the last decade, technical diagnostic research has come to the fore, especially bearing diagnostics, a lot of experience has been gathered in this field and many results have been achieved. With the development of the tools of technical diagnostics, the presentation of the topic at all levels of engineering education, and the establishment of industrial relations, an environment has been created in which it is possible to answer the current questions on the topic. Technical diagnostics, which is largely applied informatics (and mathematics) – together with several other engineering topics – also raises educational questions, which we intend to answer by transforming some elements of the training.

During the study, the simulation of a robotic drive was realised using the 20-sim simulation software. The assumed robotic drive consists of an ideal permanent magnetic DC motor, a gear pair to realise the speed reduction, a torque transfer torsion shaft and a differential gear pair to change the direction and inertia. The drive is controlled by a speed control loop using a PID controller. In line with the purpose and result of the study, the simulation proved the effectiveness of Bond Graph-based modelling.

The main target of this research, as with other I4.0 related research, is to create a system by which a quantitatively lower human resources workload is achieved in manufacturing processes, thereby allowing efforts to be better focused on creating development activities. The focus of the research work is the creation of an I4.0 compatible data processing system and algorithm which can store and forward data obtained from various machine tool and measurement equipment. To establish and appropriately use these measurement values, it is important to process the data in the most optimum way. The first step is to introduce and evaluate the measurement equipment available for our system and its capabilities in the proper transfer of data. This study intends to introduce these systems, focusing on theoretical and practical attainable accuracy.

This article describes the basis for a horizontal compact drawing robot, its use in the industry, constituent parts and how these parts and methods − drawn from electronics, mechanics and informatics − combine to make up the entirety of this machine.

In the world of manufacturing, aluminium alloy is mostly used because of its suitable properties, such as mechanical behaviour and machinability. The formation of the cluster, the erosion and corrosion, the precipitation process, artificial ageing and other factors are also discussed in this study. From the practical point of view, the main objective of this experimental study is the investigation of the ageing process of AlSi1MgMn (EN AW 6082 T6) aluminium alloy. To investigate the compound precipitation in the aluminium alloy, a heat treatment process is conducted after which a hardness test is performed and hardness values evaluated to obtained the optimal hardness value according to ageing time and temperature. Significant results have been obtained in the hardness test, however, the metallography shows no clear significant result. For better results, more tests are suggested.

An important part of technical education is the presentation of processes through experiments and demonstration tools. This direct sensual experience is one of the sources of knowledge acquisition. The illustration provides a deeper understanding of the curriculum, making the cognitive process more intense. In this study we present a refrigerator model we have designed and implemented. Measurements are then performed on a real refrigerator to study the compressor refrigeration process. The locations where data were acquired are shown on the model.

This project is based on the study of collaborative robots (hereafter: Cobot) and industrial PCs, including the communication possibilities between them. In the course of the project, a number of possibilities were studied in order to solve the problem and then summarised to select a collaborative robot and an industrial PC. After that, the focus of the project was on the communication options between the two systems: communication via I/O ports and net-work communication (TCP/IP, Modbus/TCP). Finally, the possible solutions were analysed from different points of view (complexity, flexibility, technical aspects, etc.) and communication between the chosen devices was implemented. The implementation was mainly carried out in a simulation environment, but as the project progressed a communication solution was tested on real industrial devices.