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The purpose of this work is to select the optimal method for multi-stage hydraulic fracturing simulation at the wells of a large gas condensate field X in conditions of lowpermeability reservoirs and potential risk of condensate loss in the near bottomhole zone with a decrease in reservoir pressure.At the moment, there are many ways to simulate hydraulic fracturing, each of which is characterized by its advantages and disadvantages. For specific simulation conditions, it is necessary to choose the most optimal method of hydraulic fracturing simulation, which allows you to correctly simulate all the effects that are expected during development. Within the framework of the current work, the most common numerical methods of hydraulic fracturing simulation were described in abstract, their advantages and disadvantages for specific conditions of field X were reflected. Special attention was paid to the comparison of hydraulic fracturing simulation techniques using virtual perforations and local grid refinement, since these techniques are the most common ways to set hydraulic fracturing in existing hydrodynamic simulators. Scenario calculations were carried out, which made it possible to determine the limits of applicability of various methods, compare the correctness of reproducing downhole effects, quantify the deviation of the calculation results of different methods from the reference calculation. In addition, in the course of the work, various features of the application of the hydraulic fracturing simulation through local grid refinement were described, which were revealed experimentally.As a result, for multi-stage hydraulic fracturing simulation was used a method in which the cells with hydraulic fracturing are logarithmically chopped relative to the original grid. This method allows to simulate the actual rate of decline in well productivity in conditions of low reservoir permeability, and also allows to simulate in the hydrodynamic model the effect of condensate precipitation in the near bottomhole zone and the subsequent decrease in gas productivity.

The article describes the process of creating a BS simulation model. The object of the study is the BS, which is part of the STAGE of a spacecraft placed in a highly elliptical orbit of an artificial Earth satellite. When creating a simulation model, the BS was formed by photovoltaic devices (PV) made of helium arsenide (AG), the efficiency of which is 27 %. When creating the simulation model, the following parameters were taken into account: the no- load voltage of the illuminated BS, at a steady temperature when the spacecraft leaves the Earth's shadow of the maximum duration with a deviation of the normal to the surface of the BS from the direction to the Sun, as well as a change in the output current. Also, when creating the model, the effects of external factors are taken into account, such as: a decrease in external atmospheric pressure, changes in the temperature of the BS during the passage of the spacecraft shadow sections of the orbit, ionizing radiation of the KP during interaction with magnetospheric plasma, shadowing by spacecraft structures, and others.

The article is devoted to the study of the issue of banks’ risk management. Risk management is a complex but necessary process to ensure the financial stability of banks. Research and assessment of banks’ risks helps banks understand and manage risks, make more informed decisions about granting loans, investing and other operations. Risk modeling is an important part of risk management in banks, so the article proposes improving the methodology for assessing the level of risks of banking activities, which, on the basis of forecasting methods and simulation modeling, allows to improve the validity and quality of managerial decisions in the field of management of financial activities of a bank. The task of risk assessment is a central element of the risk management system in banks. In order to improve the methodological base, the article proposes a conceptual scheme of modeling the risks of banking activity, which includes four blocks: development of currency risk assessment models; development of credit risk assessment models; stress testing of banking risks; making decisions to stabilize the financial condition of the bank in each of the proposed scenarios of modeling the risks of banks’ activity. In accordance with this, on the basis of the carried out study of the bank’s financial statements and methods of assessment and analysis of risks of banking activity, the following simulation models have been developed: a model for assessing the level of currency risk; a model for assessing credit risk and determining the amount of its reserve according to national and international standards; a complex risk assessment model. After building and examining the models, the methods of system dynamics were used, namely: simulation modeling, stress testing, and sensitivity analysis. Simulation modeling has become an effective tool for studying the risks of banking activities, as it made it possible to create virtual models of banking operations and test them on various risk scenarios. Stress testing allowed to study the impact of shock events on the financial stability of the bank. Sensitivity analysis was used to identify the most sensitive parameters of the model and to determine how changing these parameters affects the model results.

The article presents simulation modeling as a mathematical tool for implementing economic diagnostics of industrial enterprises. The objects of the study are enterprises of the fat-and-oil industry. Attention is focused on the features and problems of the functioning of the industry at the current stage in the conditions of military realities. The expediency of using the apparatus of imitation is substantiated, taking into account the uncertainty and variability of the internal and external environment of the functioning of enterprises. A model for the implementation of diagnostic studies of production and sales activities of enterprises, developed using discrete-event and agent-based simulation paradigms on the software platform of the AnyLogic system, is presented. The obtained results are illustrated by fragments of model simulation experiments. [ABSTRACT FROM AUTHOR]

Background. The problem of this work is to optimize the currently used methods for calculating the available bandwidth based on analytical calculations by building a simulation model in the AnyLogic software package. Most scientists are working on the issues of laying the traffic schedule without taking into account the complex of issues related to predictive modeling and improving the accuracy of calculating the available capacity. Materials and/or methods: simulation modeling, economic and mathematical modeling, AnyLogic software package, methods of general systems theory, logistics. Results. In the course of the work, an abstract model of a railway line was developed and built that simulates the movement of trains according to the specified traffic parameters. The results of the study can be used in the dispatching centers of transportation management of JSC “Russian Railways” in order to optimize the analysis of the subject of the completed work of the railway landfill of the road. Conclusion. The paper considers and proposes a method for calculating the available capacity on a railway line based on existing analytical formulas and the use of simulation modeling tools in order to adjust them and calculate the value of the simulation modeling coefficient proposed in the work.

A model for the flow of a gas mixture in the respiratory circuit of an artificial lung ventilation apparatus has been developed. This model can be used to calculate the optimal values for artificial lung ventilation. It can also be used to simulate various situations that may arise during the treatment of a patient. In this paper, the cases were considered when the tubes were straight and when they were subjected to physical pressure, as well as when the tubes were subjected to a change in geometry (bent). The values of excess pressure in the respiratory circuit of the artificial lung ventilation apparatus were calculated. Recommendations on the use of the model are given.

Background. The study of electronic equipment in the field of the impact of vibration load on it does not cease to be relevant for complex systems with high-speed electronic equipment. Printed circuit board manufacturing technologies, and the printed circuit board itself, currently represents a well-established production mechanism, as a result of which a high-quality product in the form of printed circuit boards is obtained. But despite the high degree of reliability of electronic equipment, and in particular its component part, as a printed circuit board, when certain conditions of external influencing factors occur, there is a high chance of its failure due to the occurrence of critical deformations and mechanical stresses in the design of the printed circuit board. In this regard, there is a problem of taking into account critical deformations in the design of the printed circuit board when certain (harsh) conditions of external influencing factors occur and developing ways to analyze, prevent and improve the design of the printed circuit board. Materials and methods. The paper uses methods and methods of mathematical, simulation, algorithmic and software analysis and calculation of critical deformations taking into account mechanical stresses in typical PCB designs to increase its mechanical strength. Results. Models and methods of modeling electronic equipment designs have been improved to improve accuracy and reliability prediction. Conclusions. The refined mathematical and simulation models of calculation of mechanical stresses and displacements of the printed circuit board, the algorithm of application of the refined mathematical model, the program of calculation of the clarifying coefficient are developed.

problem of choosing a variant of the control system structure are proposed. The research results of hierarchical distributed control systems based on analytical and statistical models for evaluating performance indicators and optimizing their structure are presented. A model and a method for optimization control systems with a hierarchical structure have been developed which makes it possible to optimize a control system with an arbitrary structure based on the synthesis of a reference variant of a homogeneous hierarchical structure. In comparison with the known methods, the assumption of uniformity of the structure of the control system makes it possible to use an analytical solution when choosing a reference plan in accordance with the proposed criterion in the vector space “efficiency-cost”. The proposed optimization method is based on proofing the possibility to analytically investigate homogenous hierarchical distributed control systems and on establishing the dependency of the cost and time of task solving in the control system on the structure parameters. The method for optimizing the structure in hierarchical distributed control systems consists of two main stages. At the first stage, within the framework of the analytical model, the direct optimization problem is solved by minimizing the processing time with a cost constraint and the inverse optimization problem is solved by minimizing the cost with a processing time constraint. The result is the choice of the best reference plan for a homogeneous control system structure. At the second stage, based on simulation modeling, the problem of determining the “critical” areas (control points) that limit the effectiveness of the control system is solved. The found “critical” areas are subject to improvement by changing their structure and introducing new technical solutions that provide the specified performance indicators of the entire management system. A model of the hierarchical structure of the management system is given. The procedure for selecting the reference variant and the algorithm for modifying the structure of the control system are shown. An example of optimizing the structure of the control system is given according to the criterion of the required throughput. The example showed that the application of the proposed method allows choosing a variant of the structure of the control system that satisfies the selected criterion and the specified constraints. It is advisable to apply the proposed method at the early stages of designing distributed information control systems when choosing variants of their construction and substantiating requirements for the technical characteristics of structural elements.

The relevance of studying gravitational processes lies in the fact that they lead to emergencies with the threat of destruction of structures, land use, and human safety. The question of a reliable quantitative forecast of their stability causes particular difficulties in the study of rock-collapse slopes. This study aims to assess the engineering-geological and hydrogeological conditions of dangerous slopes and calculate their stability. The object of the study is the geological environment of the railway route area. The main factors influencing the development of gravitational processes, geomorphological and tectonic conditions; lithological composition; physical and mechanical properties of rocks, permafrost, hydrological and hydrogeological conditions of the area are considered. Methods: brief review of the relevant literature; analysis of engineering and geological survey data; calculations of slope stability. The results. We considered the characteristics of the main factors of the landslide process of this territory, the results of calculating the stability of slopes along dangerous sections by various methods. We carried out the stability calculations; according to them the considered rock slopes in a static state and in a design seismic situation are stable across all sections. According to the results of the survey with the conducted measurements of fracturing at the reference sites, the estimated capacity of the potential capture of rock blocks, with the possible occurrence of collapses, is 2,0 m. It was determined in the field by measuring the degree of fracturing of the array. Summary. The main causes of deformations are: the steepness and aspect of the slopes, weakly lithified Jurassic sandstones composing the entire slope, and the nature of their fracturing, cutting of steep slopes in the lower part of the road. We proposed the measures to protect railway tracks.

Grinding is the most energy-intensive process among all stages of raw material preparation and determines the course of subsequent ore beneficiation stages. Level of electricity consumption is determined in accordance with load characteristics forming as a result of ore destruction in the mill. Mill drum speed is one of process variables due to which it is possible to control ore destruction mechanisms when choosing speed operation mode of adjustable electric mill drive. This study on increasing energy efficiency due to using mill electric drive is based on integrated modelling of process equipment – grinding process and electromechanic equipment – electric drive of grinding process. Evaluating load torque by means of its decomposition into a spectrum, mill condition is identified by changing signs of frequency components of torque spectrum; and when studying electromagnetic torque of electric drive, grinding process is monitored. Evaluation and selection of efficient operation mode of electric drive is based on the obtained spectrum of electromagnetic torque. Research results showed that with increasing mill drum speed – increasing impact energy, load torque values are comparable for the assigned simulation parameters. From the spectra obtained, it is possible to identify mill load condition – speed and fill level. This approach allows evaluating the impact of changes in process variables of grinding process on parameters of electromechanical system. Changing speed operation mode will increase grinding productivity by reducing the time of ore grinding and will not lead to growth of energy consumption. Integration of digital models of the technological process and automated electric drive system allows forming the basis for developing integrated methods of monitoring and evaluation of energy efficiency of the entire technological chain of ore beneficiation.

A number of requirements are imposed on installations associated with regulated DC sources, including low voltage and current ripple in the load, as well as a wide range of output current variation. Such installations are traditionally made on controlled rectifiers or pulse-width converters in which voltage ripples are always present. The paper considers a method for reducing the voltage ripple of powerful rectifiers for powering magnetic systems based on the insertion of a compensating voltage equal in magnitude and opposite in phase to the ripple voltage into the load circuit. The possibility of using ripple compensators connected in parallel and in series with the load, as well as methods of obtaining a compensating voltage is shown. Methods for obtaining compensating voltage are given. In order to exclude the magnetization of the ripple compensator transformer, it is proposed to use several versions of the compensating transformer and the inclusion of ripple compensators. Practical schemes of passive compensators (with a demagnetizing circuit and a bifilar winding) are analyzed. The problem of developing ripple compensators for multiphase rectifiers, as well as ways to solve it, is considered. Practical recommendations for choosing a core material and calculating a transformer are given. On the basis of the presented theoretical and practical considerations for the design of the ripple compensators, simulation models have been developed in the Simulink pack-age of the MATLAB program. A technique for studying ripple compensators using the simulation models of a symmetrical 12-pulse rectifier that has been developed is presented. The results of simulation of passive ripple compensators, performed in two versions, showed their effectiveness, while the scheme was relatively simple and economic costs were relatively low. Also, the time of setting the set current in the system in the presence of a ripple compensator increases by no more than 3 %, and the accuracy and stability of operation do not change.

Objectives. One of the most important tasks in the development of goniometric systems is improving resolution in terms of angular coordinates. This can be achieved in two ways: firstly, by increasing the aperture, which is very expensive and often technically challenging to implement; secondly, with the help of digital signal processing methods. If the recorded signal sources are located close to each other and not resolved by the Rayleigh criterion, it can be impossible to determine their number, location and reflection characteristics. The aim of the present work is to develop a digital signal processing algorithm for obtaining angular superresolution.Methods. Mathematical methods for solving inverse problems are used to overcome the Rayleigh criterion, i.e., obtain angular superresolution. These problems are unstable, since there is an infinite number of approximate solutions and false targets may occur. The search for the optimal solution is carried out by minimizing the standard deviation.Results. A description of a mathematical model for a goniometric system is presented. A signal processing algorithm is developed based on existing methods according to the principle of parameterization of user functions. Results of numerical experiments for achieving superresolution by algebraic methods are given along with an estimation of solution stability. The accuracy and correspondence of the amplitude of the obtained objects to the initial parameters are measured. The degree of excess of the Rayleigh criterion by the obtained solution is estimated.Conclusions. Algebraic methods can be used to obtain stable solutions with angular superresolution. The results obtained correctly reflect the location of objects with a minor error. Errors in the distribution of the signal amplitude are small, appearing false targets have negligible amplitude.

When evaluating the individual reliability of semiconductor devices by gradual failures for a given operating time, the value of the electrical parameter of a particular instance for this operating time is predicted using the simulation method. To obtain a prediction of an electrical parameter, it is necessary to have a simulation model in the form of a function of the relationship between a given operating time and the level of simulation impact. The simulation model is obtained with the help of preliminary studies (training experiment) of a training sample of semiconductor devices of the type of interest with the volume of approximately 50 ... 100 copies. The application of the model is reduced to the calculation of the level of simulation impact corresponding to a given operating time. The result of measuring the electrical parameter at the calculated level of the imitation impact in a new specimen of the same type that did not take part in the training experiment should be considered as a prediction of this parameter for a given operating time. An integral part of the preliminary research to obtain a simulation model is the testing of semiconductor devices of the training set for a long operating time, which can be tens of thousands of hours, which necessitates planning and conducting accelerated tests. The article substantiates the conditions for conducting accelerated forced tests in relation to high-power bipolar transistors of the KT872A type. The increased temperature and the reverse voltage applied to the collector junction of the transistors are chosen as factors accelerating the tests. The test acceleration coefficient is calculated relative to the operating mode of the transistors. Based on the results of the accelerated tests for the electrical parameter (collector-emitter saturation voltage), a mathematical model was obtained in the form of a dependence of its average value on the operating time. The presence of this model is necessary to determine the function of recalculating the given operating time of transistors to the value of the simulation impact.

Background. Determination of the metrological characteristics of electric drives for industrial use at the early stages of design. Materials and methods. A theoretical method for determining the metrological characteristics of industrial electric drives in accordance with the requirements specified in GOST 27803-91 is given. The main stages of research, calculation formulas and recommendations for conducting practical tests are covered in detail. A simulation model of an information-measuring and control system of an electric drive with a DPU-200-550-3-D41 engine has been developed. Results and conclusions. The results of simulation modeling and practical testing of the informationmeasuring and control system of an electric drive with a DPU-200-550-3-D41 engine that meet the requirements of GOST 27803-91 are presented.

Background. In modern realities, the issue of import substitution and modernization of existing domestic equipment and control systems in all branches of production and industry of the Russian Federation is becoming more acute. The purpose of this work is to find ways to modernize and improve the automated control system of paper production on the example of the current paper-making machine of the Penza paper mill of JSC "MAYAK". Materials and methods. The paper uses methods of modern theory of automatic control and automation of technological processes, methods of digital image processing, computer modeling. Results. A computer model of an automated process control system has been created that regulates the weight of a paper web on a paper machine. Conclusions. The considered ways of improving the automated process control system of paper production have proved their viability. The use of an automated process control system with a speed ratio regulator allowed to improve the quality of process control, reducing the effect of time lag on the system.

The aim of the study is to develop methods for forming a control channel for sorting roundwood based on an asynchronous three-phase motor with a phase rotor. In the study, a simulation modeling method is used to verify the operability of the developed implementation of the control channel, and to evaluate the errors in the functioning of the control system. Based on the results obtained, it can be concluded that the proposed method of forming a control channel for controlling discrete sorting devices can be used.

One of the main factors for the effective functioning of the power supply system in highly productive coal mines is the uninterrupted power supply of underground consumers for the entire process cycle at sufficient amount of electric energy at a high level of quality and performance. The analysis of electric energy consumption in highly productive coal mine has shown that about 57 % of electric energy consumers are located in underground workings. Consumers can be divided into the following areas of basic technological process of coal production: production areas (13 %); conveyor transport areas (13 %); preparation areas (8 %), and areas of auxiliary processes of coal production: mine drainage (23 %). The increase in the share of controlled-velocity electric drives in the total power balance of fully-mechanized longwalls leads to factors previously atypical of underground power networks. Such factors include changes to the harmonic composition of the network, arising higher current and voltage harmonics, affecting the supplying network and causing heating of electrical equipment, power and electric energy losses. Therefore, the most pressing issues are to improve electric energy quality in underground electric networks of highly productive coal mines. The study has developed a technique for experimental investigations of quality indicators of electric energy (presented in the form of algorithm) in respect to specific conditions of highly productive coal mines. These include dangerous facilities in terms of sudden gas/dust outbursts. This technique was tested at a number of coal mines of JSC SUEK-Kuzbass. The study also presents the results of experimental investigations to determine the actual level of total harmonic distortion (factor) in underground electric networks of fully-mechanized longwalls of coal mines. Of greater importance is justification of higher harmonic filter parameters. To this end a calculation algorithm based on the developed technique has been proposed. Research has shown that application of forward and inverse Clarke transformations for calculating the harmonic filter parameters is applicable for all voltage levels. The simulation model of power supply system of a coal mine fully-mechanized longwall allows conditions of higher harmonics damping to be studied by means of a device for improvement of electric energy quality. Applying the proposed technical solutions to improve the quality of electric energy based on the simulation modeling allowed the successful damping of higher harmonics to be achieved. For example, the total harmonic components voltage (THD (U)) was reduced from 9.07 to 1.77 %.

O b j e c t i v e s. To develop a control system for the movement of a mobile robot along a color-contrast line, as well as to find the values of the coefficients of a proportional-integral-differentiating (PID) controller that allows the robot to move along the line at a given speed.M e t ho d s. To adjust the values of the coefficients of the PID controller, methods of enumeration, automatic tuning and a genetic algorithm are used.Re s u l t s. A software package for tuning the PID controller of the educational mobile robot RoboCake, designed to move along a closed color-contrast line at a given speed, has been developed. The software package consists of a simulation model of the specified robot in the Simulink environment, several virtual traces-polygons and a specialized solver based on the developed genetic algorithm. With the help of the proposed fitness function, a mobile robot control system that satisfies the stated conditions is implemented. Based on the conducted model experiments, the desired values of the parameters of the PID controller are obtained.Co n c l u s i o n. A comparison of the effectiveness of various methods of tuning the PID controller is carried out. The developed software package is designed to solve the practical problem of moving a mobile robot along a color-contrast line at a speed of 1 m/s. The results obtained can be used to study methods of evolutionary tuning of stabilization systems for transport robots, ensuring their movement without overshoot.

Objectives. Simulation modeling is increasingly being used for the study of complex economic, technical, biological, etc. systems. Such systems are characterized by multifactorial relationships of their functioning, nonlinear dependencies between system elements and stochasticity of their parameters, etc. The purpose of this work is to develop a simulation model based on the C# programming language for the energy-saving CCGT-110 and ABCM system based on the results of manual analysis according to the data of a full-scale experiment.Method. Methods of linear and nonlinear approximation, methods of energy and thermodynamic analysis, as well as methods of mathematical simulation modeling are used to develop the simulation model.Result.The result of this work is the developed software SAESS 3.0, which allows you to analyze the operation of the CCGT-110 and ABCM systems together and separately in a wide range of parameters and in real time. Conclusion.To assess the adequacy of the developed program, a comparative analysis of software and manual calculation was carried out. Deviations do not exceed an average of 3 %, which confirms the reliability of the simulation model.

The formation and formation of the Industry 4.0 concept stimulated the discussion of the use of computer technology in various areas of economic activity and, in particular, in the automation of social systems management. The basis of the concept is the inclusion of a virtual image of the social system in the form of a mathematical model or a digital twin of the enterprise in the production and management system. At the same time, it should be noted that today digital twin are created mainly only for technical objects used in the activities of enterprises. The purpose of the article is to demonstrate the possibility of fixing organizational documents as one of the system-forming factors in the digital twin of an enterprise. This circumstance makes it possible, firstly, to more accurately calculate the managerial effects of managers by taking into account the impact of organizational documents on the activities of employees of the enterprise; secondly, to identify conflicts of documents developed by various departments of the company; thirdly, to calculate the content of documents during their development (design), based on the requirements of the situation or a given control effect. This possibility arises due to the use of a comprehensive mathematical model of the social system operating in an active environment. The model is a simulation agent-based model and allows you to calculate the dynamics of the social system in the socio-economic space, which allows its use in decision support systems by managers of any scale and activities to calculate the expected effect of management decisions – the specifics of a particular social system are taken into account by combining the values of the phase variables describing the state of the enterprise. The novelty of the research paper lies in the fact that it shows: the possibility to calculate the influence of organizational documents on the behavior of participants and, consequently, on the result of the social system, as well as the mechanism for converting messages, which are invariants of socio-economic space into information that affects the behavior of participants of relations.

When studying the space path of a cloud of pellets from a shotgun and evaluating its parameters, it is advisable to have a simulation model of the optical sensor signal when a shot sheaf crosses the light screen. To create such a model, you need to get the relationship between the scale parameter in the Rayleigh distribution and the time span of the shot sheaf. Studies of the temporal distribution density of the shot sheaf span are performed, and graphs of the distribution density of the span for near-real situations are constructed. A linear dependence of the mathematical expectation of the span distribution density on the scale parameter in the Rayleigh distribution is established. A simplified expression is obtained for calculating the mathematical expectation of the time span of the shot sheaf. Statistical modeling confirmed the possibility of the practical use of the proposed formulas, including with a large number of pellets (up to 1000). The dependence of the mathematical expectation of the span on the number of pellets is investigated, its approximation by various functions is carried out, and the approximation errors are estimated. The research conducted allows us to create a simulation model of the optical sensor signal when the shot sheaf crosses the light screen on the basis of empirical data on the real-signal duration (with averaged measurement data for several shots being helpful).

Background. The design and principle of operation of a multi-sensor fiber-optic converter of binary mechanical signals based on a fiber-optic digital-to-analog converter (DAC) of a serial type is considered. Materials and methods. The method of linearization of the device transformation function, its mathematical and simulation models are described. Results and conclusions. The advantages of the proposed device in comparison with an analog based on a parallel DAC are substantiated.

THE PURPOSE. Examine the problem of reliable functioning of small electric power fiscal metering locations (EPFML) based on unconventional instrument current and voltage converters (Rogowski coil and resistive divider). Identify the most severe environmental conditions in which EPFML can be operated. Conduct research into EPFML thermal condition in different grid operation modes, and also during high voltage testing. Determine the conditions in which heat emission at the resistor divider attains its maximum value. METHODS. To solve the problem, use was made of three-dimensional hybrid field and chain simulation models, calculated by the methods of finite elements and linear electric circuit theory. The developed simulation models enable research to be conducted not only in normal, but also emergency electric grid operation, during lightning and pulse surges, insulation testing, and in the presence of insolation. RESULTS. The article presents the results of research concerning the thermal condition of a 6 (10) kV automated electric power fiscal metering location. CONCLUSION. If a resistive divider is used as a primary voltage converter, maximum heat emission occurs in the event of intermittent single phase arc faults to earth in accordance with Petersen’s theory. The results of the conducted research show that an EPFML based on a resistive voltage divider should be calculated using simulated models, taking into account insolation and the daily pattern of changes in maximum ambient temperature.

The article considers the General approach and elements of implementation of the simulation model of the decision support system as one of the most effective ways to improve the management system of a mining enterprise. The paper gives the description of the technological process and the main functional blocks of the control system. The author identifies the key links and requirements for the implementation of the simulation model of production process and enterprise management. The subsystems of the model allow us to consider the dynamics of the production enterprise in all the variety of its activities, for different variants of the technology and organization of production of the existing control system, the planned system and promising management solutions. In addition, the article presents the structure and description of the implemented simulation model of the main production process of the experimental coal mine. The paper indicates the role of the user-manager in the decision-making process based on the results of modeling. The author gives a control example of the simulation results.

The relevance.Today, the production of oil is generally carried out in a mechanized manner, which is sufficiently energy intensive. In the cost structure of oil production, the value of electric power is from 30 to 35 % of the value. Considering that the submersible plants oil production is impossible without loss of power that is 20 to 40 % power consumption, the technology to increase the energy efficiency oil production has a high potential of embedding. One of the promising directions of electric power consumption reduction by submersible installations is the technology of submersible compensation. On the one hand, the introduction of the submersible compensator results in increase of the cost of purchase, maintenance, mobilization or hire of the submersible plant. On the other hand, the use of submersible compensator reactive power results in reduction of the cost of electric power and increase in production efficiency. The use of submersible compensators makes it possible to reduce the loss of active power in the power transmission system of the submersible installation by reducing the reactive component of the current submersible motor. However, with different technical characteristics of the submersible installation equipment, the effect of the submersible compensator will be different. In this relation, it should be avoided that the cost of introduction of the submersible compensators will be higher than the positive effect of introduction. It is necessary to determine the aggregate cost of possession of an electric centrifugal pump installation with a submersible compensator reactive power. The aim of the research isto analyze the reduction of current electric power consumption with the use of the installations electric centrifugal pumps with the submersible compensator reactive power. The object: portion of the power supply system of a cluster oil producing wells equipped with installations electric centrifugal pump. Methods: laws of electrical engineering theory, electric drive theory, simulation methods and technical-economic rationale. Imitation modeling of a portion of the power supply system of the well cluster is performed in a Software Complex of MatLab Simulink. Result. The paper describes the method of calculation of aggregate cost of possession of electric centrifugal pump with submersible compensator. The software model of the section power supply system of the well cluster is built in the MATLAB Simulink. It has been found that the use of submersible compensators results in reduction in power consumption at the ownership of a submerged installation. The maximum reduction in power consumption on one of the test submersible units was 303,6 thousand rubles in year.

Vibrations of construction and road machinery components that occur during their operation are a harmful production factor for machine operators, therefore, their reduction can be considered a very urgent task. The main route of vibration transmission is through vibration isolation systems for the operator’s seat and cab. The easiest and most cost-effective way to isolate the operator from vibration is through his seat by reducing vibration. The simplest and most reliable vibration protection systems with one degree of freedom limited by vertical movements of the chair can be used for the chairs. Vibration protection mechanisms and systems with quasi-zero rigidity are considered promising. They provide constant static force over a certain range of movement of the object. The task of developing mathematical models describing vibration protection systems with quasi-zero rigidity is urgent. In the Matlab software package using the Simscape library for modeling physical elements, a simulation mathematical model of the vibration protection system of a chair with one degree of freedom has been developed. The base of the chair in the developed model performs harmonic sinusoidal movements. The output parameters of the developed mathematical model are the time dependences of the chair coordinates and accelerations. The blocks used in the model are described, the static force characteristics are given, given using the Hermite spline. The model includes a block of hard movement restrictions. An example of using the developed simulation mathematical model of the chair is given. The developed model makes it possible to specify both the dimensions of the quasi-zero stiffness section and the shape of the curves of the force static characteristics of the vibration protection system. It can be integrated into higher level models.

The digital twin is a virtual model of the agricultural tool working element that allows you to calculate and predict its expected behavior during the entire period of operation.(Research purpose) To develop an algorithm for consistent models that make up the digital twin of the agricultural tool working element.(Materials and methods) The fi rst component of the digital twin algorithm was determined by the method of accelerated imitation loading of the wedgelock ripper working element, which was accepted as the research object. The second component was determined by testing various soils with the specifi cation of power equivalents. The physical and mechanical properties of soils and materials (hardening) for the manufacture of working elements were taken into account during the description of the following components.(Results and discussion) The author showed that the algorithm for constructing a digital twin of the agricultural tool working element consisted from a chain of successive actions and was a system for digital description of the working element, which ensured the standard lifetime during operation. The results of a simulated immersion which registered the nature of the normal forces distribution over the friction surfaces were accepted as the fi rst component of the algorithm. The second component – the results of determining the force equivalent when loading the working element in a real soil environment. The possibility of constructing maps of the intensity of the friction surface abrasive wear, predictive calculations of structural elements was revealed. The third and fourth components were used to ensure the working element standard lifetime, based on the minimum production costs, correlated to the standard resource unit of development.(Conclusions) The resulting algorithm for constructing a digital twin is a convenient tool for creating new designs of agricultural tools working elements.

According to the relevance of the study, the new challenges of the financial environment, the growing dynamism of globalization and digital changes in national and global financial relations. Conceptual awareness of financial transformation necessitates the development of new tools for scientific knowledge of the prospects for the development of the financial market of Ukraine in terms of digital imperatives. The purpose of the study is to identify innovative ways of long-term development of the financial market of Ukraine in terms of digitalization of society. The object of research is the latest financial and digital processes of prospects for the development of the national financial market of Ukraine in terms of digital transformation. The research methodology is special and the latest approaches to the development of financial relations. Prospects for the development of financial relations are innovative: regulatory framework; system-institutional structure; functional and instrumental base; technological and digital transformation; financial and digital security; financial inclusion.

Purpose: choosing the best option for equipping water metering points with telemetry based on information and simulation models of the functioning of these water metering points using the target function. Materials and methods: the studies are based on the use of information-analytical methods, mathematical dependencies and probability-economic calculations. Results: based on the use of information and functioning simulation models using the target function, a dependence based on the use of the included variables allows making a choice of the best option for equipping water metering points with telemetry tools was proposed. A calculation of equipping the water metering points with telemetry using the example of the Raigorod irrigation system of the FSBI “Volgogradmeliovodkhoz” Authority was made. Based on the calculation, a schedule for choosing the best option for equipping water metering points with telemetry tools was built. The graph showed that the optimal (economically feasible) option of equipping water metering points with telemetry is equipping seven out of 10 water metering points planned for a one-year payback period of this event. Conclusions: the multicriteria task of constructing a simulation model comes down to determining the best option for equipping water metering points with telemetry with maximum profit and minimum cost. To make the right decision on equipping water metering points with telemetry in each specific case, it is necessary to conduct a full examination of these water metering points from the point of view of the technical condition, to develop a feasibility study on options related to the re-equipment of water metering points, as well as to make appropriate information and adjustments to the design and engineering documentation for water metering points.

Aim. The article considers the physical basis for the formation of a technical channel of information leakage due to low-frequency acoustoelectric transformations. Methods. The research was based on simulation modelling methods. The method of instrumental and computational control of the security of speech information in the considered channel of information leakage was applied. Results. Based on the developed simulation model, using the Model-View-Presenter design pattern, a software tool was developed. The main software classes implementing this model are presented. The functionality of the developed software tool is demonstrated and recommendations are given on the possible application of the developed simulation model for identifying threats to information security due to low-frequency acoustoelectric transformations. Conclusion. The developed simulation model can be used by security specialists at both large and small enterprises, which implement measures for ensuring information protection. The model creates conditions for its active implementation in the educational process of training specialists in the field of information security, using both traditional (contact work) and distance learning formats.

Low energy consuming products are eternal target of all household appliance manufacturers. To acquire desired energy index, high efficiency variable capacity compressors have started to be used widely on refrigerators. Reed valves and valve plate designs are the most critical issues in the development of reciprocating compressors in terms of coefficient of performance (COP). The stiffness of the reed valves and the port geometries play an important role on reducing the losses at various speeds and operating conditions. In the last decade, Fluid-Structure Interaction (FSI) method has started to be used in order to investigate valve dynamics. Because of the complexity and high computational cost of FSI method, system simulation tools are still preferred for faster and simpler solutions. In-house developed simulation tool uses flow and force coefficients to calculate valve dynamics and mass flow rate. Those are calculated with the Computational Fluid Dynamics (CFD) analyses with respect to the valve lift. In the present study, flow and force coefficients at different piston positions were investigated. Piston pin which is used to reduce dead volume was also considered as a parameter. CFD calculations were established for steady state conditions at different valve positions with Ansys Fluent. The calculated flow and force coefficients were implemented into the simulation tool and the effect of piston position was presented in terms of COP, cooling capacity and compared with the experimental results

The paper considers the algorithmic possibility of the image rejection method. The main resulting characteristics of circuits implementing the above method are presented. The simulation model allows estimating the selectivity coefficient as a function of the phase and amplitude imbalance of the circuit branches. Mathematical and circuit simulations were conducted. The results of different modeling methods coincide, and the simulation results verify the possibility of implementing the image rejection method. On the basis of this model it is possible to provide a high level (at least 40 dB) of image rejection by amplitude and phase circuit imbalance compensation. The dependence of the noise level at the output of the image rejection circuit as a function of the circuit elements frequency characteristics is given. The results of this work could be used for further practical implementation of above mentioned method at the stage of selecting elements based on an analysis of their characteristics. The simulation model could be used to select required radioelements and to estimate image rejection level. It is possible to estimate the level of image channel suppression, the noise level and the signal-to-noise ratio at the output of the image rejection circuit by using the above mentioned mathematical models and characteristics of the selected elements for practical implementation of the circuit. The effect of the broadband phase shifters on the noise level is considered with the implementation of the above method as an example. It was shown that ensuring a high level of selectivity in order to minimize the noise level of the image channel is advisable only up to some values (about 25 dB). Further improvement of selectivity, for example, by minimizing the phase and amplitude balances, or mutual compensation of the mixer and phase shifter branch imbalances are necessary, if there are requirements for increasing the signal-to-noise ratio. It is shown that it is possible to ensure selectivity of up to 25 dB and a noise level reduction of 2.5-3 dB if the amplitude imbalance of the circuit is up to 1 dB, and the phase imbalance is up to 5 deg. in the required frequency band.

A new method is proposed for increasing the power factor of an electric locomotive by changing the minimum opening angle of thyristors α0 of a rectifier-inverter converter. The decrease in the angle α0 is due to changes in both the structure of the transducer and the zone of its regulation. A pulse synchronization device has been developed that makes it possible to generate pulses with strong distortions of the mains voltage Uc at the points of natural transition of the voltage of the fundamental frequency Uс through the zero line. Based on this device, an α0 pulse-forming device was developed that eliminates the influence of pre- and post-switching voltage fluctuations. A “contact network—electric locomotive” model was created in the environment of MatLab/Simulink, taking into account the nonlinearity of the longitudinal parameters of the contact network. The effect of decreasing the angle α0 on the character of pre- and post-switching voltage fluctuations was analyzed, and the parameters of transient processes were calculated. Particular attention was paid to modeling the parameters of traction network. The primary network parameters adopted in the model correspond to theoretical parameters for the selected type of contact suspension. Their high convergence is confirmed by the calculation of the coefficient of determination R2. Calculations on the “contact network — electric locomotive” model show that compared with the standard scheme of the electric locomotive, where the minimum opening angle of the thyristors is α0 = 9° el., the decrease in the angle α0 to 4.5° el. leads to an almost twofold decrease in the amplitude of pre-switching voltage fluctuations and a small decrease in the amplitude of post-switching voltage fluctuations. The model results indicate that a decrease in the minimum thyristor opening angle α0 leads to an increase in the power factor of the electric locomotive.

The paper presents definitions of digital twins. The authors examine a hypothesis that a digital twin of a food product is a mathematical (simulation) model that includes the whole variety of factors influencing quality and safety. An approach to the mathematical setting of the structural optimization task at different stages of description of the technology for a food product digital twin is analyzed. The first stage, which has several levels, is connected with correspondence of the nutritional and biological values to the medico-biological requirements. The second stage is linked with predetermination of structural forms, the third with perception of sensory characteristics (color, odor and so on). The universal method for assessment of quality and efficiency of a food product digital twin using the generalized function (integral index) is described. Different individual responses can be components of the additive integral index: physico-chemical, functional-technological and organoleptic.

The present study aimed at the development of an endodontic simulation model, able to implement the electronic method of working length determination (EAL) in a setting of undergraduate learning. The development of the simulation model was accompanied by several investigations, helping to assess products’ potential and aiming to create the sound scientific basis for its future implementation as a learning tool. This investigation was conducted in the framework of the regular phantom-lab course. During the initial implementation 450 student have been trained. The models’ capability to imitate clinical conditions was investigated by means of radiographic, macrophotograpic and CAD/CAM techniques. The EAL-features of the present model allowed not only for precise determination of apical constriction (R²=0,0198) versus radiographic method (R² = 0,0019), but also granted a precise preparation of the apical constriction in the vast majority of cases (up to 83%).

Based on the model developed by the specialists of JSC "VNIIZhT" for determining the rational dimensions of the irreducible reserve of locomotives at the turnover stations (Мнр), mass calculations were performed to determine the size of the reserve depending on the influencing factors. The value of Мнр substantially depends not only on the size of the motion, but also on a number of other factors that are taken into account in this model. Using the model, it is possible to carry out calculations to establish the influence of various factors on the value of М . The first question of this study is the analysis of the dependence of the magnitude of Мнр on various factors (multivariate analysis), determination of its significance and ranking of factors. The second question is the determination of the numerical values of М in the form of practical recommendations for its use in determining the size of the minimum reserve of locomotives at the turnover stations, taking into account the various effects of the factors under consideration: average daily train flows and its fluctuations per day, oddness of operating trains, planning quality (deviation of planned train flows from actual), the level of fulfillment of the tasks of the plan for sending locomotives by a single follow-up at the turnover station. In total, 1575 variants of the work of locomotive turnover stations were calculated, in each of which the sizes of the irreducible reserve of locomotives are determined by the results of work for 400 days. The total data set amounted to 630 thousand results. As the result, the significance of the factors is established, its ranking is made. Based on the results of modeling, a table of standard values of the irreducible reserve of locomotives at the turnover stations was developed, which can be used by the employees of the JSC "Russian Railways" for practical purposes. This will improve the quality of execution of the train schedule and reduce unproductive downtime of trains ready for departure at locomotive turnover stations.

The article substantiates that in the conditions of digitalization of the Ukrainian economy, the decision of the online buyer to choose and purchase goods is influenced by reviews/comments on the Internet. It is determined that the successful online activity of the retailer, including a positive image and the desired level of sales, is provided by her/his ability and skills to correctly respond to the reviews/comments of the online buyer. On the basis of the systematized literature sources and a comparative analysis of the results of empirical researches of well-known leading scholars and economists at the national and international levels, the author presents the typology of reviews/comments of the online buyer, which defines the specifics of the retailer’s response. The need and importance of developing alternative patterns of timely response of retailers to reviews/comments of the online buyer in ever-changing realities is proved with arguments. Appropriate recommendations to the retailer regarding an adequate response to the reviews/comments of the online buyer are suggested according to the typology, their differences are interpreted. A simulation model of the retailer’s response to negative reviews/comments of the online buyer with desensitization of the target audience according to the context of the current situation has been developed. In the development of this simulation model, using the «BP Simulator» software to simulate business processes, a relevant low-abstraction approach was applied, taking into account management features at all strategic levels, and providing for the possibility of modifying the model based on the scale and metrics of the retailer’s practical activities. The results of the practical approval of the developed simulation model show the feasibility of its implementation by retailers of different market segments to improve the efficiency of online activities.

The study is relevant due to the landsliding which lead to emergencies with the threat of building destruction, land use, and human safety. Special difficulties in the study of landslides are caused by forecasting the activation of landsliding. The aim of the study is to assess the engineering-geological and hydrogeological conditions at the site of the bridge crossing and forecast the development of the landslide process on the slopes using FEM modeling. Object of the study is the geological medium of the area of the designed bridge within the Volga upland. The paper considers the main factors influencing the development of landslide: geomorphological and tectonic conditions; lithological composition; physical and mechanical properties of soils, hydrological and hydrogeological conditions of the area. Methods: brief review of the literature; analysis of information obtained from the funds of the survey company, calculation of slope stability, modeling of the behavior of the soil massif FEM. The results. We considered the main factors of the landslide process of this territory and calculated the stability of slopes on dangerous sections by various methods. The slope is unstable in general. The simulation showed the expansion of landslide deformation zone on the left side to 107 m, on the right bank of the river to10 m from the bed with a seasonal increase in the level of groundwater. Summary. The main causes of deformation are: weakly lithified Jurassic clay, composing the entire slope; groundwater formed within the plateau and discharged into landslide accumulations, maintaining high moisture in them. It is recommended to use a layer of Permian clay deposits with high physical and mechanical characteristics as a bearing layer for bridge supports.

The article reflects a model of the cloud educational environment, the structure of which is represented by online courses and a hybrid intelligent system that allows you to create and adjust real-time individual trajectories of studying these courses. It was established that, despite its complexity, dynamism, and sometimes uncertainty, it should provide timely and continuous access for each student to starting online courses, their multimedia content and function stably under any load. It is shown that the collaborative work of students also involves the sharing of various educational objects of an online course (for example, webinars, video lectures, and virtual models), each of which requires a certain quality of service (QoS), productivity, the possibility of process planning, resource management. The possibility of using the queuing theory apparatus to create a model of the intelligent cloud educational environment is described. The results of an experimental study of the constructed simulation model are presented. It is concluded that the desired model is adequate and is able to cope with a large flow of students' requests. The proposed model is universal and can be used to develop a cloud-based online learning platform, the software and technology infrastructure of which must meet the needs of a rapidly growing mass of students of online courses.

The object of the research is the process of design calculation of linear dimensional chains. The purpose of this article is development of a method to choose the most rational combination of admissions and deviations on the basis of modeling of accidental combinations of these parameters by means of a genetic algorithm and selection. Imitating modeling of calculations with the choice of the best option by the criterion used in the article provides the solution of a design problem of calculation of dimensional chains with high probability at rather broad range of a combination of the sizes and technical requirements to them. This criterion evaluates an error of a deviation of a design value of the closing link from a preset value. It gives the chance to the designer, even at the worst combination of parameters of the sizes, to solve a problem with the maximum error and to evaluate the directions of change of a design for the purpose of its reduction.

Рассмотрена актуальная для узловых аэропортов задача оптимизации численности технологических ресурсов функциональной подсистемы аэропорта, осуществляющей наземное обслуживание перевозок в рамках отдельной технологической операции. Анализ ограничен неполнодоступными системами, в которых обслуживание определённых заявок может быть выполнено только определёнными технологическими ресурсами, под которыми понимаются средства механизации и автоматизации, производственное оборудование, персонал и т.д. Оптимизационная задача сформулирована в вероятностной постановке. Описан подход к её решению. В качестве инструмента оптимизации предложено использовать имитационную компьютерную модель, учитывающую особенности потоков пассажиров и производственного процесса узлового аэропорта и включающую нечёткий регулятор, который отражает логику диспетчера аэропорта, управляющего процессом наземного обслуживания. Приведён модельный пример решения оптимизационной задачи, свидетельствующий о возможности и целесообразности использования нечёткого регулятора в качестве модели стратегии человека-оператора. Составляющая основной результат оптимизации временная зависимость численности технологических ресурсов функциональной подсистемы применима на этапах принятия решения о повышении её пропускной способности, оперативного управления ресурсами, планирования сменной работы персонала, решения ряда других задач, особенно актуальных для узловых аэропортов с их интенсивными, но неравномерными потоками самолётов и пассажиров.

Дефекты планетарных редукторов турбовинтовых двигателей часто являются источниками возбуждения высокочастотных колебаний, вызывающих поломки элементов конструкции компрессоров. Вибрационное состояние данных редукторов представляет собой широкополосный процесс с наличием большого количества составляющих колебаний, что существенно усложняет поиск информативных диагностических признаков дефектов. Для упрощения процедуры идентификации вибрации, вызванной дефектами зубчатых зацеплений, предложена имитационная модель вибрационного состояния узла дифференциального редуктора турбовинтового двигателя. Модель учитывает кинематику и конструкцию редуктора, определяет структуру его вибрационного состояния при наличии дефектов на боковых поверхностях зубьев. На примере часто встречающегося дефекта в виде износа зубьев пары «солнечная шестерня – сателлиты» показана адекватность модели фактическому вибрационному состоянию механизма.

The primary objective of a cluster policy is to ensure high rates of economic growth and diversification of regional economies by improving competitive abilities of enterprises, suppliers of equipment, components, providers of specialized production and customer services, R&D and education organizations that comprise geographical clusters. The cluster approach is a key constituent of the socioeconomic strategies in several Russian regions and municipalities, as shown by the project “The Cluster Policy Concept in the Russian Federation”, developed by the Ministry of Economic Development of the Russian Federation. This article focuses on a methodology for successful spatial clustering and cluster specialization analysis in the Rostov Region as the subject the Russian Federation. A comprehensive analysis of the spatial development of a subject of the Russian Federation is carried out through generalization and systematization of urban planning documents, together with the analysis of the current state of spatial development in the region. Presently, there is no integrated approach to assessing this territory of the Russian Federation in terms of the cluster policy development. The co-authors suggest customizing the universal assessment methodology for the cluster development of the Russian Federation. A comprehensive analysis of spatial development of the Russian Federation is carried out through generalization and systematization of urban planning documents, together with the analysis of spatial development in the region. A comprehensive assessment of a territory represents an integrated approach to the analysis of the spatial distribution and quality characteristics of all types of resources. A comprehensive assessment of the territory was made using geographic information systems, which are extensively used in the process of managing the spatial development, particularly in the spatial analysis of territories. ArcGIS software package is used as a tool for the comprehensive assessment of the territory. Following the comprehensive assessment, functional specialization maps of the Rostov region were made. The transportation and logistics cluster was indicated on the map, and the rating of the Rostov Region’s districts was displayed on the map.

Mathematical and simulation model has been developed for modeling the biomechanical movements of a human limb. The developed model algorithm is based on the biological presentation and shutdown in the process of maintaining the positions of the final individual muscles or their groups. Work in models is due to statistical values. A comparative analysis of experimental and model data shows the high efficiency of the simulation model. The created simulation model allows to study the principles of the neuromuscular system. This model is scalable, which will allow us to switch to three-dimensional modeling to study the signs of self-organization of biosystems at the level of the neuromuscular system and central nervous system.

The relevance of the research is conditioned by the need to verify the data of «submersible motor – downhole compensator» node obtained on the simulation model with the results of bench tests. The downhole compensation of reactive power is a relatively new technology to improve the energy efficiency of oil production facilities compared to the existing methods. Due to the technical features of placement of reactive power compensators in the production string of an oil well, in some cases, it is not economically feasible to study the installation of an electric centrifugal pump with a downhole compensator to determine the optimal parameters of the installation at the real site. Therefore, the development of an adequate simulation model of the «submersible electric motor – downhole compensator» node is an important task, which allows solving the problems of construction, operation and modernization of electric submersible pumps at minimum material costs. The aim of the research is to study the downhole reactive power compensator in a Matlab Simulink software environment and experimental studies of an submersible asynchronous electric motor with an downhole compensator on a laboratory bench. Object: a submersible asynchronous electric motor with an intra-well reactive power compensator. Methods. SimPowerSystem library blocks of MATLAB Simulink software complex were used for development of the imitation model of submersible asynchronous electric motor. To check the adequacy of the simulation model, a submersible asynchronous electric motor and a prototype of an intra-well reactive power compensator were manufactured. Bench tests were carried out at the plant of Almaz LLC, which has licensed laboratories and certified specialists. Result. Simulation model of the load node «SEM-DRPC» (submersible electric motor-wellbore reactive power compensators) was developed to simulate electromechanical processes of the node. A prototype of an intra-well reactive power compensator was developed. Based on the results of bench tests of a submersible asynchronous electric motor with intra-well compensator, the operating characteristics were obtained. Verification of the data obtained on the simulation model with the results of the experiment is carried out. It is established that the developed simulation model of the load node «SEM-DRPC» adequately reflects the electromechanical processes of the node. Discrepancies between the calculated and the experimental data were less than 10 %. Prospects of experimental-industrial tests of the submersible asynchronous electric motor with intra-well reactive power compensator are determined.

The article is devoted to the development of a simulation model of an electrical system with distributed generation on the example of power supply of residential buildings. Existing models of such systems have several drawbacks: not represented principal power consumers of the equivalent circuit of the individual power consumers is incorrect, the calculation of parameters of equivalent circuits of power consumers and other elements of electrical systems that are not described methods of measuring the main parameters of the electrical system. In this regard, there is a need to generalize the results obtained earlier and create a simulation model of the power supply system of residential buildings with distributed generation, taking into account the above shortcomings. The aim of this work is to develop a simulation model of the power supply system of residential buildings with distributed generation, including principal consumers, a description of the calculation of parameters of equivalent circuits of power consumers and other elements of electrical systems, review of methods of measurement of basic parameters of the electrical system. The result of the work is the creation of a simulation model of the power supply system of 6 residential buildings in the software package SimscapePowerSystems (Matlab). The model takes into account the main types of current-using equipment of a residential building. The paper describes the calculation of the parameters of the equivalent circuit of current-using equipment, electric transmission lines and power transformer. The method of measuring the basic parameters of the system using the blocks U, I, P Measurement and Powergui is considered. The results of measurements of the basic parameters of the system are showed.

The work is devoted to the features of propagation of electromagnetic signals (20–1000 kHz) along multi-wire overhead transmission lines. For monitoring the status of overhead power lines, a location method can be used. For connection to power lines, the connection equipment is used, which forms the high-frequency path of the power line, which has a limited frequency bandwidth. To select the optimal signals of location probing, it is necessary to investigate the impact of high-frequency path on the pulsed signals. This paper investigates the distortion of pulsed location signals in high-frequency paths. The influence of elements of the high-frequency path is studied using a simulation model of the high-frequency path of an overhead transmission line developed in the PSCAD software environment with subsequent experimental verification. Elements of high-frequency path of the developed simulation model are described. The influence of duration of the probe pulses on the shape and spectrum of the reflected signals is analyzed. It was established that during the passage of microsecond pulses, their differentiation occurs, the reflected signal is a combination of responses from the rising and falling edges of the probe pulse. With this in mind, criteria are proposed for optimizing the duration of the location pulses. During formation of ice deposits on the overhead lines wires, additional distortion of the pulse signals’ shape occurs. Using the experimental data, the distortions of the reflected pulsed signals and their spectra are analyzed as ice deposits grow on the wires of overhead power lines. The established patterns of pulse shape distortion and the developed criteria for optimizing the pulse duration are used for location probing of overhead power lines to control ice deposits on the wires and to detect damage.

Thai jewelry is the world’s leading jewelry which has gained high reputation and recognition from customers worldwide. In the past decade, jewelry have become one of the top ten export product of Thailand with the current export value of around 58,000 million baht per year which is 3.4 percent of all Thailand export products. Due to the high competition in the world market, however, Thai jewelry manufacturers needs to continue to improve their product quality as well as process efficiency in order to gain more market share. Currently, computer-aided tools have become more powerful tool in jewelry production management. They have been used to design production process, plant and workstation layout, production planning, worker’s scheduling, and other decisive decision making in both high management and shop floor levels. This research demonstrates a case study of plant simulation application for jewelry production process improvement. The objective is to reduce bottlenecks and increase productivity in wax pattern and casting processes using line balancing. Various scenarios have been proposed in order to support different level of desired output rate due to the increase of demand. The results of line balancing and simulation models reduce bottlenecks. Hence, productivity is increased. The desired throughput rates are achieved with the minimum number of workers and machine in the system.

The task of controlling multi-link robots with manipulators for implementation of high-tech processes in industry has been considered in the paper. The paper presents sequential steps of using computer technology in construction of robotic-manipulators, including mathematical, algorithmic, and hardware and software tools for creating a multi-drive mechatronic system controlled by OMRON industrial microcontroller. A kinematic scheme of a robot manipulator has been described in the paper and it performs the following two types of movements – rotation around the z axis and rectilinear movement of a working element along a turning radius with precise positioning at a given point in the working space. Electromechanical design of the manipulator allows to ensure transportation of production objects in accordance with a given technological process. For designing the technological process of transporting production objects, a software module has been developed that makes it possible to automate description of basic operations for movement of the robot manipulator working body with subsequent automatic generation of a command sequence for a control program ensuring operation of electric drives in manipulator links in real time. To speed up the process of designing trajectory of the working body, a spatial simulation model of a robot-manipulator in the MatLab-Simulink environment has been developed. The paper considers a generalized diagram of a mechatronic control system for a robot-manipulator based on the OMRON programmable logic controller operating under control of a program developed in the programming environment Sysmac Studio Automation. A program for a programmable terminal with interface elements and animation elements has been developed for industrial use of the mechatronic system during adjustment and operation period. The paper provides an appearance of a robot-manipulator prototype. The developed mechatronic system of the robot-manipulator can be technologically oriented towards solving other problems of industrial production.

Objectives. At present, conducting a computational experiment on a system for protecting information from unauthorized access operated in an automated system is a time consuming process. The greatest difficulty in this area of research is the determination of probabilistic-temporal characteristics and the formation of reports during the operation of the information protection system. In order to analyze, obtain and study the probabilistic-time characteristics of this system, it is necessary to develop a mathematical model of its operation using an imitational modeling tool.Method. One of the methods for solving this problem is a computational experiment, which is based on the construction of a simulation model. The CPN Tools environment was chosen as a software simulation product, the main advantages of which are: a high level of visualization, the ability to generate various reports on the system operation, fast modifiability of models for solving a different class of problems, as well as integration with other software means for the formation of graphical dependencies.Result. A simulation model of the system for protecting information from unauthorized access in the “CPN Tools” software environment was developed. protected performance.Conclusion. The presented im-model model of protecting information from unauthorized access in the software environment “CPN Tools” can be used as a tool in assessing the security of special bodies for the attestation of informatization objects and structural divisions of authorized departments. It can also be used in the design of such systems in order to prevent logical errors, determine their temporal characteristics and compare with the existing ones in accordance with the technical specifications for the system being developed to protect information from unauthorized access.