Vol 30, No 4 (2024)

The article describes the reasons for uncertainty causing a decrease in the efficiency of industrial systems for galvanic coatings production. The proposed methodology is used to create problem-oriented systems for decision-making support and intelligent control under uncertainty to improve the efficiency of industrial systems for the galvanic coatings production. The relationship between the principles of the system approach, methods and algorithms that form the proposed methodology is given. The architecture is demonstrated, and the algorithmic support of the systems is described.

The peculiarities of chemical industry enterprises influencing the organization and carrying out of repair of technological equipment are considered. Special attention is paid to the repairs, the fulfillment of which relates to partial or full stoppage of production, and to the planning of shutdown repairs. Seven types of repairs corresponding to the term “shutdown repair” are singled out. Three main stages of planning are presented: the formation of the production task for repair; the development of the repair network model and the development of the repair logistics system. The description of the problem statement of calendar planning of shutdown repairs and its solution is given. Due to the complexity of the direct solution of the problem, an iterative approach is proposed, in which the solution of the main problem is replaced by solving a number of simpler problems of independent importance. The obtained results are realized in the development of the system of scheduling of shutdown repairs. The application of the system is possible for any types of productions related to stop repairs, which is confirmed by the calculation example.

The paper presents a system for diagnosing the rail fastening conditions on railway tracks based on video materials obtained using a rail measuring car. The set of classes of the most significant defects in rail fastenings affecting the reliability of the railway train movement has been identified. The diagnostic system is developed on the basis of a pre-trained neural network using the Mobilenet v3 Small COCO SSD model. The analysis of defect recognition metrics has been performed, and diagrams of the main metrics of a neural network for recognizing rail fastenings are presented depending on the number of training epochs. It is shown that the proposed diagnostic system provides an object recognition accuracy of at least 0.96. High accuracy is achieved through pre-processing of rail track dataset frames: rotation, scaling and marking.

Synthesis of optimal algorithms for information-measuring and control system based on satellite radio-navigation system for solution of aircraft landing problems is carried out by methods of the Markov theory of estimation of random processes. Three independent channels for processing the output signals of the satellite radionavigation system, radio altimeter, barometric altimeter and inertial navigation system have been synthesized to ensure control over the integrity of navigation data. The block diagram of information processing in the information-measuring and control system with integrity control of the true flight altitude of the aircraft has been developed.

A comparative analysis of operational characteristics (temperature measurement range, energy consumption) of metallic and semiconductor primary temperature measuring transducers (TMT) has been carried out, which has shown a significant advantage and feasibility of designing and using semiconductor transducers. A mathematical model describing the dependence of the output current of the developed TMT on the basis of “metal – dielectric – semiconductor” structure on temperature taking into account the main design-topological and electrophysical parameters of the structure is constructed. The influence of design-topological and electro-physical parameters on energy consumption of the converter, which is important in aviation technology, is considered. Using the developed and experimentally confirmed mathematical model, the output characteristics under different conditions are calculated. The simulation results are analyzed and investigated to identify the optimal design-topological and electrophysical parameters at which the designed TMT consumes a low value of energy. As a result, the design of the temperature TMT based on the structure “metal – dielectric – semiconductor” with design-topological and electrophysical parameters providing low power consumption was obtained and described, which will allow its efficient use in air vehicles.

The paper presents the principles which are recommended to be used in automated design of process equipment for multi-product chemical production: decomposition of general design problem into a number of interrelated subtasks, modeling of design solutions with orientation to the formation of fields of defined parameters, optimality of design solutions and designability. The principles are illustrated through the example of the problem of determining the hardware design of the chemical industrial system of the designed multi-product chemical industry.

In order to improve and predict quality indexes of long profile rubber billets, experimental studies have been carried out to estimate the efficiency of ultrasonic influence using waveguide installed perpendicularly (radially) to the flow of extruded rubber mixture at the output of material cylinder before forming head, which also contributes to the development of new methods of polymer processing in the process of recycling polymeric materials, including crumb rubber.

The paper describes the principle of operation of a new high-efficiency dust collector-classifier including three stages of dust and gas flow purification. The method of calculation of the minimum size of particles captured at the first stage of this device, based on the laws of particle deposition in the laminar regime, is proposed. Calculation of the minimum size of captured particles – foundry wastes is carried out. The dependence of the minimum size of captured particles on the gas flow rate, as well as the distribution of the minimum size of captured particles along the cross-section of the first stage is obtained.

В целях выбора параметров управления при оптимизации процесса экструзии и конструкции оборудования для переработки резиновых смесей в длинномерные профильные заготовки установлен характер и вес относительного влияния основных технологических и конструктивных параметров между собой и на функции состояния, таких как полезная мощность, производительность шнековой машины, критерий подвулканизации и суммарный сдвиг в каналах шнека, то есть исследована их совместная корреляция.