This study is a pilot one. The purpose of the study is to identify the nature of the relationship between Poisson's ratio and cohesion, on the example of a soil mass. The main objective of the study is to identify the dependence of Poisson's ratio and cohesion coefficient to obtain the fracture limit of the material (in this study of soil massif) - plastic flows in the material. The study is conducted by methods of mathematical modeling. In order to achieve the objective, it is necessary to justify the possibility of performing this experiment by means of boundary value problem, and to perform the ranking of the number of numerical experiments by experiment planning method to obtain the extrema. Next, it is necessary to perform the numerical experiment itself to reveal the relationship between Poisson's ratio and cohesion. The obtained data will be used to compose the inverse problem when testing a new Russian software product in the field of geotechnical and geomechanical modeling.

Keywords: Poisson's ratio, cohesion, soil massif, numerical experiment, finite element method, mathematical modelling, plastic flow, deformation, stress

The article discusses the equipment for a single-seam excavator for removing single stumps and the technology of work with its use. A modernized design of this equipment is proposed, an analysis of the modified technology of uprooting is performed, recommendations on the use of the proposed equipment are given based on the results of the comparison.

Keywords: technology of uprooting, single stump, direction of stump extraction, moment of uprooting of trees

An original approach to describe airflow in the thin conic diffusor is suggested. It is based on approximate analytic solution of continuity equation. In addition simplified model of turbulence is combined. Reliability of derived formula is confirmed by comparison with finite-element solution for designed experimental setup. The elaboration is intended to direct computer simulation of multiphase flow.

Keywords: dust-air mixture, aspiration systems, turbulence, finite element modeling, separation diffuser, digital twin

A program for computer simulation of atomization of liquid fuels has been developed. A special calibrating experiment was carried out in a gravitational field. Verification of the computer model with experimental data is carried out, the correctness of simulation modeling is determined by the convergence of the results of static generalization. Tests of a model sample of the burner device were carried out, confirming the adequacy of computer simulation.

Keywords: burner, atomization of liquid fuels, mathematical modeling, fuel jet dispersion dynamics, nozzle

Pipeline fittings, which include butterfly valves, are not unimportant in pipeline systems. The main function of this design element is to prevent emergencies in pipeline systems. The principle of operation is based on closing of the shut-off device in case of change of direction of the transported medium flow. This ensures reliable flow control and prevents backflow of the medium in the pipeline. The rotary check valve provides reliability, tightness and safe operation of systems, as well as durability with regard to safety requirements. The article deals with the design and calculation of rotary check gates. The purpose of development of such a model range is to create a durable and reliable design, which will be able to ensure during the whole service life a safe operation in production with different parameters of the working environment. To confirm the reliability and serviceability parameters of the design, strength calculation of the butterfly valves has been carried out. As a result of numerical modelling of all designed check gates, the calculated parameters allow to give positive assessment to the gates and confirm compliance with technical requirements.

Keywords: rotary check gate, modelling, mathematical modelling, finite element method, calculation of reliability indices

The safety of hazardous production facilities is directly related to the reliable operation of pipeline systems, as a failure occurring in the elements of such systems can lead to serious consequences for production facilities and the environment. Since the greatest number of failures is associated with faults caused by corrosion, to increase reliability it is necessary to increase the corrosion resistance of metal of pipeline elements. The article gives an overview of materials for manufacturing parts, the influence of different climatic conditions on the mechanical properties of steels. The developed rotary gate designed for automatic prevention of reverse flow of working medium is also presented. To confirm the serviceability of the design, strength calculation of the structure was carried out, where its stress-strain state under the given loading conditions is considered. As a result, the values of maximum equivalent stresses, maximum deformations and displacements were obtained, which are lower than the maximum permissible ones.

Keywords: pipeline system, pipeline, shut-off valves, swing back gate, mathematical modelling, finite element method

The movement of robotic systems can occur in conditions of interference disturbances, different in quality and power. In this case, the actual task is to correct the initial planned trajectory of the robot's movement in order to evade the latter from the action of these sources in order to maximize some quality functionality. It is advisable to associate the latter with the probability of successful passage of the target trajectory in the field of interference effects. The peculiarity of such an adjustment is the complexity of optimizing the corresponding probability functionals, which leads to the need to develop approximate optimization methods based, however, on a fairly accurate calculation of the probabilities of successful passage for each specific trajectory. In this article, we propose such an approximate correction technique that allows us to effectively bypass interference sources defined by their known areas of action and characteristic probabilistic functions. This technique is based on an iterative procedure of successive approximations to such a trajectory, which has a given probability of successful passage. The developed technique can be effectively integrated into the movement planner of robotic objects moving in conditions of obstacles with fixed boundaries, as well as corresponding repeller sources, information about which allows us to estimate with sufficient accuracy the probability of successful passage of any trajectories in their vicinity at a given speed mode of movement.

Keywords: robotics complex, repeller sources, motion planning, probability of successful completion, iterative procedure, target functionality

This article discusses the issue of the features of measuring and predicting changes in the surface electric field strength in the atmosphere. The results of measurements of the atmospheric electric field strength are presented. The possibilities of forecasting changes in the surface electric field strength, including the use of numerical models, as well as the use of measurement results as an indicator of dangerous weather phenomena, are considered. The prospects of using the prediction of variations in the surface electric field intensity to predict adverse weather events and the importance of monitoring the intensity of the atmospheric electric field for understanding global climate change processes and the impact of the electric field on human health and the environment are discussed. For the research, a model was created that allows predicting electric field variations based on meteorological data. The developed neural network has shown good results. It is demonstrated that the use of neural networks can be an effective approach for predicting the parameters of the electric field of the surface layer of the atmosphere. In further research, it is planned to expand the measurement area by including additional parameters such as temperature, pressure and humidity in the analysis, as well as using more complex machine learning models to improve the accuracy of forecasts. In general, the results show that machine learning models can be effective in predicting variations of the electric field in the surface layer of the atmosphere. This can have practical applications in various fields such as aeronautics, meteorology, geology and others. Further research in this area contributes to the development of new methods and technologies in the field of electric power and communications and to improving our knowledge about the nature of the impact of atmospheric electrophysical phenomena on the environment and human health.

Keywords: electric field, surface layer of the atmosphere, measurements, methods, forecasting, modeling of variations in field strength

Public bus transport is an important part of the life of most residents of the city. The age of a city bus affects its safety, efficiency and competitiveness. Based on the above, the life cycle of buses needs to be managed. The purpose of the study is to analyze the life cycle of urban buses and develop management solutions. The research period is from 2012 to 2022. The place of collection of information is Tyumen. The uneven renewal of rolling stock can lead to a significant financial annual burden on the city budget. The experience of the functioning of the urban transport system has shown the demand for the use of buses of particularly large and high capacity. Such a management decision helps to increase the comfort of passengers and increase the level of road safety. The dependence of the influence of extensive bus renovation on the share of budget expenditures in Tyumen is presented. It is proposed to distribute the annual cost of buying new buses evenly. It is necessary to strive for an equilibrium system, when planning an extensive development path for the urban public transport system. The methodology of this research can be used by legislative and executive authorities when planning the city budget.

Keywords: urban transport system, city bus, life cycle of urban buses, public transport

In this paper, the possibility of applying graph neural networks (NN) to study the structure of copper centers of zeolites is considered. The dataset used for NN training was prepared using the FDMNES software based on the finite difference method and included more than 2100 Cu K-XANES spectra for Cu-MOR. The performed study demonstrated the capability of graph neural networks to reproduce the Cu K-XANES spectrum corresponding to a particular model of the copper center in the zeolite framework.

Keywords: zeolite, mordenite, atomic structure, XANES, machine learning, graph neural networks

In this paper, the importance of transport networks for the development of the country's economy is considered. It is determined that at the same time, a huge number of heterogeneous factors affect the functioning of transport networks. In this case, in order to optimize transportation processes, it is necessary to have information about the state of the road network in advance. Geoinformation systems are an effective tool for presenting data of this kind, which allow storing and processing spatial and related attribute data. The author proposes a technique for geoinformation mapping of road conditions using the open OSM project. Openstreetmap provides access to up-to-date geographical information, as well as software tools for data processing. The paper defines the type and levels of damage to the roadway, a geoinformation project has been developed, which reflects the main types of damage to the roadway of a section of the road network.

Keywords: geoinformation system, geoinformation mapping, road network, OpenStreetMap

In the field of information security (IS), virtual simulation technology is used in many areas, its value has been proven and attracts the attention of many specialists in this field. Virtual modeling is widely implemented in information systems (IS) and plays an important role in IS research on big data platforms. The purpose of this work is to study and solve the problem of the lack of experimental environment for information security technologies in universities and colleges. After understanding the main points, a training research project was carried out using extensive use of virtual IS models. As a result of empirical analysis, the authors came to the conclusion that a platform for simulating a virtual experiment can solve the problem of developing professional competencies among students in the field of information security, increase students' interest in information security technologies and achieve the educational goal of developing an independent innovative spirit and practical skills among students. To implement the test system, software packages of BREST virtualization tools were used, installed on physical servers with the Astra Linux SE operating system.

Keywords: information security, virtualization, software package of virtualization tools “BREST”, Astra Linux SE operating system, training of information security specialists

The article discusses the problem of collisions with pedestrians at pedestrian crossings. An analysis of the conditions for the occurrence of accidents at pedestrian crossings was carried out, and the main factors influencing the risk of pedestrians getting into accidents were identified. One of the main reasons for such accidents is the “sudden” appearance of a pedestrian in front of the car. Other factors are also considered, such as poor lighting, dirt on the roads, insufficiently developed road infrastructure, etc. It has been established that high-quality street lighting helps reduce the number of accidents at pedestrian crossings. A formula has been proposed: “To prevent road accidents, you need to see and be seen.” The authors come to the conclusion that it is necessary to take measures to ensure safety at pedestrian crossings, such as installing traffic lights, improving road markings and lighting.

Keywords: collisions with pedestrians, road safety, pedestrian crossings, street lighting, road infrastructure, transport information system

The influence of the location of reinforcing bonds on the general condition of cylindrical mesh shells is investigated. Cruciform core elements made of tubular profiles were used as reinforcing structures. The number of reinforcing elements is 8 (4 on each panel). Opposite nodes of adjacent faces are connected by cross-shaped elements in the direction of the arc. The expediency of placing reinforcement elements inside each of the two middle panels and at a distance of one panel from the middle of the length is checked. As a result of the conducted studies, the regularities of the stress-strain state and dangerous areas of the shell were determined. When using cruciform joints, a decrease in the forces in the elements and a decrease in the movements of the nodes were revealed. A redistribution of internal force factors and a decrease in the number of typical sizes of elements were recorded. A rational scheme of reinforcement of the structure is obtained.

Keywords: cylindrical mesh shell, reinforcement, cross-shaped elements, forces, displacements

The article discusses automatic selection of coefficients for PID controllers of quadcopter motors based on a 3D model. This selection became possible thanks to the method discussed in the article for exporting a 3D model of a quadcopter, created in the Solidworks CAD system, into the Matlab/Simulink environment, as well as with the further use of the SimMechanics library. To select the coefficients, a quadcopter control system is also implemented to the Simulink project, the signals from one sent to the motors in accordance with their physical location. The result of the article is a flight visualization of a 3D model of a quadcopter with a control system implemented in Simulink.

Keywords: solidworks, matlab, simulink, quadcopter, uav, pid, simmechanics