№ 3 (2025)

Background. The article describes the current direction of development of the domestic machine tool industry – the development and implementation of multi-coordinate machining centers. The main directions of improving multi-coordinate machining centers due to information-measuring and control systems are given. The necessity of using computer simulation modeling in designing control channels of information-measuring and control systems of multicoordinate machining centers is proved. Materials and methods. A simulation model of a servo electric drive (position control channel) based on a DC motor has been developed, including an actuator of the ball screw type. The developed model is made using the Simscape Mechanical library. Results and conclusions. The article presents the results of the study proving the operability of the developed models and the possibility of their application in designing control channels of information-measuring and control systems of multi-coordinate machining centers. The obtained results meet the requirements for metal-cutting equipment.

Background. The current service life of mobile metrological complexes in most cases does not have a serious technical justification and is a reflection of the generalized norms of depreciation charges for the complete restoration of equipment that have long been established by law. Therefore, they can and should be considered as a deadline, upon reaching which the possibility of further operation of the mobile metrological complexes should be objectively assessed. Materials and methods. The article presents a method for adapting the service life and parameters of the metrological maintenance strategy of a mobile metrological complex to its reliability level. Results and conclusions. This method allows calculating such a service life that ensures the required value of the readiness factor of the mobile metrological complex.

Background. Transparent conducting oxides (TCOs) are key functional materials for modern optoelectronic devices, including touch screens, solar cells, and light-emitting diodes. Antimony-doped tin dioxide (SnO₂:Sb) is of particular interest as an alternative to the more expensive indium tin oxide (ITO) due to its high thermal and chemical stability, as well as the availability of raw materials. However, the mechanisms of Sb incorporation into the SnO₂ crystal lattice and its influence on electrical and optical properties remain insufficiently studied. The objective of this research is a theoretical and experimental investigation of the substitution processes of tin atoms with antimony atoms in different oxidation states (Sb³⁺ and Sb⁵⁺) and the determination of optimal synthesis conditions for producing TCOs with improved characteristics. Materials and methods. Thin SnO₂:Sb films were deposited using spray pyrolysis from precursor solutions of SnCl₄·5H₂O and SbCl₃ in a mixture of ethanol and deionized water at a substrate temperature of 450 °C. The antimony concentration was varied from 0 to 10 at. %. To improve crystallinity and activate dopants, the samples were thermally annealed at 600 °C for 1 hour. The structural, electrical, and optical properties of the films were studied using a comprehensive set of advanced techniques, including surface resistance, charge carrier mobility and concentration, as well as transmission, refraction, and absorption coefficients. Results. It was found that at an optimal antimony concentration (3–5 at. %) and properly selected synthesis conditions, Sn⁴⁺ is predominantly substituted by Sb⁵⁺, leading to donor doping and a significant improvement in conductivity while maintaining high transparency in the visible range (80–90 %). At Sb concentrations above 5 at. %, the formation of compensating defects and phase segregation was observed, resulting in degraded electrical properties. Thermal annealing enhanced crystallinity, reduced defect concentration, and activated Sb dopants, leading to a decrease in resistivity from 10⁻²–10⁻³ Ω·cm to 10⁻³–10⁻⁴ Ω·cm. Conclusion. This study established fundamental mechanisms of antimony incorporation into the SnO₂ crystal lattice and optimized spray pyrolysis synthesis parameters for producing high-quality SnO₂:Sb-based TCOs. The developed material exhibits a combination of high transparency, good conductivity, and thermal stability, making it promising for various optoelectronic applications, including solar cells and touch screens. The use of cost-effective and environmentally friendly materials promotes sustainable technological development and reduces reliance on rare and expensive elements.

Background. Modern production is developing in accordance with the six directions of Industry 4.0. This article discusses two of them – PLM (Product Lifecycle Management) and Smart Factory as concepts that are inextricably linked with the concept of «digital twin». The relevance of this technology, as shown in, is due to the importance of digital transformation in the logistics industry and its impact on competitive advantages over other enterprises. The purpose of the work is to predict the parameters of the state of a mobile robot based on the formation of information links between a digital twin and a physical object. Materials and methods. The research is based on the interaction of MES/APS systems (Manufacturing Execution System/Advanced Planning and Scheduling) in combination with IIoT (Industrial Internet of Things), mobile robots, as well as dynamic modeling methods. Results. Simulation models of mobile industrial robot drives have been developed, and algorithms for interaction between a digital twin and a physical object have been proposed. Conclusions. The proposed method of intelligent control and monitoring makes it possible to increase the reliability of the MES system based on predicting parametric failures of a mobile robot.

Background. In the development of the space industry, an important aspect is to reduce the cost and time, as well as improve the quality of measurements of the parameters of electronic equipment. Including products that combine both analog and digital units, which include adaptive control channels. To reproduce the properties of radiation of outer space, modeling and simulating installations are used, which is associated with the complexity of the infrastructure of measuring stands, high cost and duration of measurements, difficulties with unsatisfactory test results. The purpose of the presented study is to develop a specialized stand for measuring the parameters of adaptive control channels based on a digital model of the sample under study, reproducing the effects of ECB associated with the impact of cosmic rays using software and hardware methods to assess the stability of adaptive control systems under controlled conditions. Materials and methods. The work is based on the integration of hardware and software components. The hardware part includes a system for introducing and tracking changes in the parameters of analog and digital signals operating in the test sample by means of high-precision ADCs and microcontrollers providing synchronous control of the parameters. A thermal chamber is used as a source of temperature effects close to the conditions of outer space. The software part is implemented on a PC as a module for controlling the stand, which includes: a controlled source of the measured physical quantity; a system for introducing and tracking changes in the parameters of analog and digital signals operating in the test sample; additional measuring equipment that can be included in the measuring stand at the request of the tester. Results. The theoretical basis of the stand has been formed, namely: the purpose, technical capabilities, structure of the hardware and software complex and a detailed description of its components. Conclusion. The developed stand ensures safe, flexible and comprehensive measurement of the parameters of electronic products, the methods currently used to improve reliability, quality, reduce the cost and duration of measurements. Its implementation accelerates the development of reliable systems for space vehicles.

Background. An urgent task of developing devices for indirect cardiac massage used in the process of cardiopulmonary resuscitation in case of out-of-hospital cardiac arrest is to ensure effective ventilation of the lungs without damage to the chest regardless of the personal characteristics of the resuscitated person's constitution. The aim of the work was to develop an intelligent information-measuring system of the device that will allow adapting the operating mode of the pressure generation subsystem to the personal characteristics of the resuscitated person's constitution and organizing its metrological self-control. Results. Based on the analysis of current regulatory documents, characteristics of existing devices and the results of patent research, the structure of an intelligent information-measuring system of the device for indirect cardiac massage was developed. Conclusions. Intellectualization of the information-measuring system of the apparatus for indirect massage by introducing structural redundancy in the form of a group of identical channels for measuring the pressure on the chest of the resuscitated person based on a strain gauge sensor and functional redundancy in the form of calculating the arithmetic mean of 16 synchronous results of pressure measurements increases the efficiency and safety of performing indirect cardiac massage during cardiopulmonary resuscitation.