Journal оf Energy, Mechanical Engineering and Transport

Combined installations based on renewable energy sources (control, generation of electric and thermal energy)

2025-12-15T07:52:46+00:00

In recent decades, humanity has been actively looking for sustainable and environmentally friendly ways to meet its growing energy needs. Renewable energy sources (RES) such as solar, wind, hydropower, biogas, and geothermal energy are the main focus of these efforts. In this regard, combined installations based on renewable energy sources are being actively introduced, which make it possible to simultaneously generate electrical and thermal energy, increasing the efficiency and stability of energy systems. Combined installations powered by renewable energy sources represent an innovative and efficient approach to energy generation, combining several systems of its production and use into a single cycle. These systems optimize the use of renewable energy to generate electricity and heat, ultimately improving overall energy efficiency and stability. The main concept is cogeneration, the process of simultaneous production of two types of energy: electric and thermal. In the case of renewable energy sources, this process typically uses solar, wind, biomass, and geothermal resources. For example, photovoltaic-thermal (PVT) solar systems combine solar photovoltaic panels to generate electricity with solar thermal collectors to generate heat. Similarly, biomass power plants and geothermal installations are capable of producing both electrical and thermal energy, meeting the needs of the industrial, residential and agricultural sectors.

Methods for assessing the technical condition of belt conveyors

2025-12-15T04:48:34+00:00

The article analyzes the operation of belt conveyor units operated at various mines, processing plants and other enterprises. The main factors leading to failures of conveyor elements are given. The analysis of methods for assessing the technical condition of belt conveyors is carried out, brief descriptions of the methods of control and technical diagnostics used in the operation of belt conveyors are given. The method of vibration diagnostics for assessing the technical condition of the belt conveyor drive station during the operation of the equipment is described. The measuring equipment for carrying out diagnostics is listed. Based on the analysis results, a monitoring system is proposed to assess the technical condition of the belt conveyor drive station. A functional structural diagram of the monitoring system, a description of the proposed system operation, and the advantage of the proposed monitoring system are presented.

Automation of control and management of technological process

2025-12-15T06:09:12+00:00

The article describes the materials and methods used to automate the control and control of the technological process when processing parts on multi-purpose machines. The main control element is a measuring probe, which is integrated into the machine and allows measurements to be made at the processing workplace. This makes it possible not only to control the size deviations of the parts, but also to adjust the processing parameters in real time. The measurement process is performed in a preset machine program, where the coordinates of the characteristic points of the part are measured. Coordinate deviations are used to calculate the accuracy of processing. The measured deviations can be compensated by automatic correction in the control program. However, the accuracy of measurements on the machine is limited by the accuracy of its positioning, which is inferior to coordinate measuring machines. The positional coupling control system makes it possible to compensate for spatial deviations when moving machine components caused by equipment inaccuracies and other factors. To increase accuracy, software algorithms are used that allow you to adapt the processing parameters to the current deviations. In addition, algorithms have been implemented to automatically calculate deviations and make necessary adjustments to the control program of the machine. The use of microprocessor control allows you to quickly change the program commands and thereby maintain the continuity of the processing process with real-time adjustments. Thus, the proposed approach of automation of control and control allows to increase the accuracy of processing by integrating measuring and correcting systems into the control circuit of the machine.

Study and application of graph theory in decision making in engineering problems

2025-12-15T06:26:18+00:00

This paper is one of the directions of scientific research on the application of the method of graphical representation of technical and organizational systems. The paper analyses the application of graph theory in engineering problems. The graph theory finds application in many industries, for example: in computer science, programming, communication and transport systems, economics, engineering graphics, logistics. The concept of a cycle (contour, path) in an oriented graph is introduced, and the application of graph theory to a number of transport problems is also shown. Wide application of graph theory provides also the study of network graph of reliability of prototype product creation in engineering graphics and mechanical engineering. The network graph from the point of view of graph theory is a directed graph, the vertices of which are the events of the network graph and the arcs - its work. The graph theory is also used in the construction of intermediate positions of the working zone of a quarry. In these tasks a three-dimensional graph of multivariate development of mining operations in the quarry G(EG)=G(EN) is formed from the obtained indicators. The graph theory based on topological principles can be successfully applied in open-pit mining operations to solve a number of transport problems, such as the minimum cost, the shortest path and the capacity of the exit system for various types of quarry transport, etc. The graph theory can be used for the solution of a number of transport problems.