When developing technologies for managing production and technical systems, there is a tendency to use the principles of multi-agency, which reflect the development of the system concept of distributed processing of matter, energy and information. To perform work and solve target functional tasks in multi-agent systems, it is assumed that parallel functioning system objects are involved, which to a certain extent are endowed with subjective rights and play the role of executive agents. By introducing components of intelligent control of the components of the designed system, the processes of their individual and group functioning are implemented. With this in mind, the article analyzes the main schemes for organizing processes for solving functional tasks and suggests indicators of the efficiency of multi-agent technologies use. In particular, a variant of solving unrelated system tasks using the same type of executive agents is considered. The possibility of using the same type of agents to solve multivariate problems with subsequent consolidated results is shown. A variant of preliminary decomposition of tasks into separate logically completed phases and further obtaining an aggregated result is also given. An approach to solving functional tasks based on a parallel-sequential conveyor  implementation of their individual stages and subsequent selection of an adequate result is presented. As indicators of the effectiveness of the application of multi-agent technologies to solving system problems, characteristics based on the assessment of time and probability  of obtaining correct results are proposed and analyzed. Thus, the group of indicators characterizing the solution process includes the total time for completing tasks by a group of agents, as well as the compression coefficient in the form of the ratio of the average time of a single-agent sequential solution of a set of tasks to the standard time of their multi-agent execution. The process under consideration is also characterized by the calculated probability of providing the necessary set of solutions in a given standard time and the probability of obtaining a set of correct results with multiple parallel solutions of the problem using a group of agents.

. The effect of preliminary treatment with a pulsed magnetic field on a composite mixture of powders (polytetrafluoroethylene, stabilized copper powder, basalt fiber, dispersed inorganic friction additive) for obtaining pressed polymer friction materials is investigated. An experimental device IMI-I was used for processing. The magnetic field strength, number of pul-ses and their polarity were varied. The change in the surface structure of a composite material after pressing, cutting, as well as the surface after friction tests was studied using the method of optical microscopy. A significant effect of the magnetic field on the structure of the samples was found. The homogeneity of the free surface increases, porosity decreases, the morphology changes significantly and the ability of phase visualization increases. A change in the cut surface formed by the tool when cutting a ring blank into individual samples is noted. Treatment in a magnetic field leads to the formation of a less developed surface relief; the effect is intensified with an increase in the number of pulses from two to four, as well as with an increase in the field strength. The morphology of the friction surface changes significantly: the treatment helps to reduce the differences between the peripheral region and the center of the sample. Transfer films are formed much less intensively. The polymer phase does not demonstrate the presence of viscous areas. The phase composition and change in static displacements of atoms from equilibrium positions were studied by X-ray structural analysis. It was found that the phase composition of the material does not change under the influence of magnetic treatment. It is shown that preliminary treatment of the composite mixture with a magnetic field affects the static displacements of atoms from equilibrium positions in the copper phase. Treatment in a magnetic field helps to form an equilibrium structure of copper due to improvement of the crystal lattice. It was found that the effect of exposure depends to the greatest extent on the number of pulses and their polarity. The use of a unipolar pulse is the most effective.

The effect of anode modes (electrochemical, switching, electrolyte-plasma) in the treatment of AISI 321 steel in an aqueous solution of ammonium sulfate with a concentration of 5 %, which is widely used in the practice  of electrolyte-plasma treatment of corrosion-resistant steels, on metal removal, current efficiency and specific energy spent, has been established. The greatest metal removal is observed at the border of the electrochemical and switching modes, as well as in the area of the switching mode. Depending on the electrolyte temperature, the maximum removal in this case exceeds the values corresponding to the electrolyte-plasma mode by 6–8 times. In the region of voltage values corresponding to the electrolyte-plasma mode, the coefficient of metal current efficiency h is significantly higher than at voltage values corresponding to electrochemical and switching modes. Depending on the electrolyte temperature, the values of h are in the following ranges: in electrolyte-plasma mode – 0.40–0.62; in switching – 0.18–0.24; in electrochemical – 0.16–0.24. In the electrolyte-plasma mode (210–330 V), the maximum coefficient h is provided in the region of the electrolyte temperature range of 70–80 °С. The electrolyte-plasma mode is characterized by high energy consumption per unit mass of removed metal (q/Dm) compared to the electrochemical mode. So, at a temperature of 80 °C in the electrochemical mode in the voltage range of 10–70 V, the parameter q/Dm takes values of 0.04–0.31 W·h/(cm²·mg), and in an electrolyte-plasma mode (120–330 V) – – 0.14–0.50 W·h/(cm²·mg). At a temperature of 90 °C in the electrolyte-plasma mode, the value of the parameter q/Dm varies from 0.26 to 0.63 W·h/(cm²·mg). The obtained results are the basis for creating effective complex processes for improving surface quality and dimensional treatment, in which both electrolyte-plasma and electrochemical modes are combined in one stage. This treatment scheme allows to take advantage of each of the anode modes: intensive metal removal at low energy consumption in the electrochemical mode and polishing the surface with the achievement of high surface quality in the electrolyte-plasma mode.

In this paper, the deflections of a rod and a rectangular plate with any types of boundary conditions are proposed to be represented as a series and a double series of eigenfunctions of the differential equation of bending vibrations of a beam or plate with the corresponding boundary conditions. Then, using the Ritz method, the functional of the total energy of rod bending and bending and torsion of the plate and the external load acting on them is determined. For a rod with any types of boundary conditions, by differentiating the functional of the total energy, an exact solution for deflections in the form of a rapidly converging series is obtained. In this case, previously published results by S.P. Timoshenko and E.S. Sorokina are used. For a rectangular plate, using the orthogonality property of eigenfunctions and their second derivatives, a quadratic functional of the indefinite coefficients at the eigenfunctions is calculated. Differentiating the functional with respect to each of the unknown coefficients forms an infinite system of linear algebraic equations, the solution of which by the truncation method allows us to find the deflections of the plate. Further, the forces in the plate are found using known methods. Two examples of calculating a rectangular plate with four supported edges and a plate with two supported edges are given. The proposed approach is simple, universal and allows calculating rectangular plates with any types of boundary conditions on the contour for an arbitrary external load. The article provides a table of eigenvalues and forms for calculating rectangular plates.

The aim of the work is the calculation assessment of stresses in the elements of composite building reinforcement caused by differences in the Poisson’s ratios of reinforcing fibers and polymer binders. The research methodology is based on the development of a micromechanical model of the interphase interaction of the reinforcing fiber and a polymer matrix in an elementary cell, which is a hollow polymer micro-cylinder in which a fibrous reinforcing filler is located in the form of a connection with a deformation tension changing under load. The transformation of the Lame problem to the calculation assessment of the effect of differences in the values of the Poisson’s ratios of the reinforcing fibers and the polymer matrix, as well as nominal tensile stresses and the volumetric content of fibers in the composite reinforcement on changes  in local stresses in the reinforcing fibers and polymer matrix is made. Analytical dependencies are obtained linking the parameters of the local stress-strain state of the walls of an elementary cylinder in the vicinity of a fibrous filler with a set of indices of the physical and mechanical properties of  polymer matrix materials and fibrous filler (moduli of elasticity and Poisson's ratios), as well as the volume content of the filler. As an example, these parameters are calculated for a wide range of degrees of filling with glass and basalt fiber for a number of polymer matrices (epoxy and polyester). It is shown that in the range of the volumetric filler content of 0.5–0.7, contact pressures at the interface of the reinforcing fibers with the polymer matrix are from 2 to 6 % of the nominal tensile stresses in the polymer matrix, depending on the combination of  Poisson ratios of the fibers and the matrix. In this case, the circumferential tensile stresses in the polymer matrix at the interface with the fiber are from 11.6 to 19.2 % of the nominal axial tensile stresses in the polymer matrix for fiberglass and from 10.6 to 17.1 % for basalt-plastic reinforcement. The research results can be used in scientific research and educational activities.

The paper provides an assessment of the technical condition of combined insulated rolled roofs with a sequential arrangement of layers and ventilated roofs of large-panel residential buildings of standard series built in Belarus before 1993. The results of field studies have shown that after more than 30 years of operation, the technical condition of the materials of the main structural layers (bearing structure of the coating, vapor barrier, materials of the thermal insulation layer) is operable. Defects that have a negative impact on the functional suitability of roofs as a whole are recorded only in the main  waterproofing carpet and cement-sand screed. It has been established that the causes of the appearance and development of operational defects (loss of coarse-grained sprinkling with roofing material, stagnation of water on the roof, cracks in the bitumen coating layer of the rolled roof, swelling between the layers of the rolled roofing carpet) are “harsh” operating conditions of roofs: constant, throughout the entire period of operation, influence on the materials of atmospheric influences, as well as violations of the technology of roofing work. To maintain the working condition of combined insulated rolled roofs of large-panel residential buildings operated for more than 30 years, the main material and financial costs fall on partial repair of the waterproofing carpet, including local repair of cement-sand screed. The reason for the local destruction of the roof screed of large-panel residential buildings built before 1993 is its insufficient frost resistance, due to the requirement laid down in the design of such buildings to ensure the strength of the screed material in terms of  frost resistance for the rated service life of large-panel residential buildings, i.e. for at least 30 years.  Considering that the standard service life of all large-panel residential buildings built before 1993 is more than 30 years, the problem of ensuring the operability of the screed will become increasingly relevant. It is proposed to extend the service life of the screed without repairs and reduce heat loss through the combined coating to install an inversion roof on the existing roof.

The vehicle's body oscillation when traversing bumps not only causes driver discomfort but also negatively impacts the quality of the transported cargo. Consequently, numerous research studies have been conducted to improve suspension system characteristics with the goal of enhancing the vehicle’s ride comfort and body stability. The majority of them have shown that equipping trucks with an active suspension is the most effective technical solution for ensuring comfortable working conditions for driver and cargo safety. This paper focuses on modeling and controlling an active suspension system for a truck in specialized simulation software, followed by evaluating its effectiveness compared to traditional passive suspension. In particular, the paper presents a quarter-vehicle suspension model integrated with an auxiliary hydraulic cylinder submodel controlled by a PID controller. The input parameters of the simulated suspension system were determined during full-scale experiments with real vehicles in laboratory and road conditions. To confirm the adequacy of the proposed mathematical model an experimental scenario was designed for measuring the vehicle body's oscillation parameters when traversing a step bump in the “passive” suspension control mode. After validating the model, the study proceeded to investigate the effectiveness of the active suspension system with the auxiliary hydraulic cylinder pressure PID control and compare the obtained results with the “passive” control option of the suspension system. The survey results indicate that the active suspension system, in conjunction with the PID control algorithm, significantly improves key performance metrics of the system. Specifically, the study found a reduction in oscillation damping time from 1.61 sec to 0.92 sec, a 16.7 % decrease in maximum amplitude  of vehicle body oscillation and a substantial 61.5 % average reduction in vehicle body oscillation acceleration. On the other hand, in the active suspension system, the damping ratio also improved by about 5.8 % (from 0.260 to 0.245). These findings underscore the effectiveness of the active suspension system, as developed in this research, in enhancing the overall performance of the vehicle in terms of stability, safety, and ride comfort.

The global significance of green energy in mitigating environmental damage has garnered substantial attention. However, recent indications suggest a less optimistic outlook for the social acceptance of green energy transportation (GET), accompanied by potential challenges and difficulties from various perspectives. Recognizing the urgency to address this issue and the current absence of a comprehensive overview of the knowledge structure in GET research and its determinants, there is a critical need for high-level insights. In response, this paper aims to provide a clear and accessible bibliometric analysis of GET research and its determinants using MATE (Multi-faceted Analysis of Textual Evidence) methodology. Firstly, employing various bibliometric analyses, the paper offers an in-depth examination of GET publications. This includes insights into active authors, highly productive countries/regions, prominent journals, citation structures, and the thematic evolution of GET. These analyses provide a visual representation of the current landscape of GET research. Secondly, complemented by content analysis, the paper categorizes and identifies key determinants of GET, encompassing technical considerations, adopter levels, corporate promotions, and environmental challenges. This comprehensive approach contributes to a nuanced understanding of the multifaceted factors influencing GET. Finally, the paper synthesizes the findings to highlight existing knowledge gaps and proposes potential future research directions in the realm of GET. By doing so, it equips scholars with a systematic knowledge base and a well-structured comprehension of GET research and its determinants. This research, guided by MATE analysis, serves as a valuable resource to navigate the complexities of GET, facilitating informed decision-making and fostering further exploration in this crucial field.