Vestnik of Samara State Technical University. Technical Sciences Series

Journal Vestnik of Samara State Technical University ( Technical Sciences Series) has been published at SSTU since 1993 and now it is an academic periodical aimed at scientific research development, support of leading scientific schools and staff training.

The journal publishes original experimental and theoretical articles of leading national and foreign scientists on the most topical problems of system analysis, automation and control of technological processes, IT, Electrical Engineering, Instrumentation and Metrology, Energetics, Metallurgy and Material Science.

Research headings :

  • Informatics, Computer Science and Control
  • Instrumentation, Metrology and Informative-measurings devices and systems
  • Electrical Engineering

The Journal is included by the Higher Attestation Commission (VAK) in the list of leading scientific magazines and editions.
Full-text access to articles is available on site at http://elibrary.ru

Current Issue

Vol 30, No 4 (2022)

Information Technology and Communications

Analytical solution of the boundary value problem of mathematical modeling for non-stationary oil flows through the trunk pipeline in the presence of internal pressure sources
Afinogentov A.A., Tychinina Y.A.
Abstract

The main oil pipeline, due to its spatial extent, can be considered as a control object with distributed parameters (ODP). The dependences on time and coordinates of the flow velocity and pressure in the pipeline are considered as controlled output values of the ODP. The boundary value problem of mathematical modeling of the process of pipeline transportation of oil in the standard form is presented in the form of a linear partial differential equation of the second order. The paper presents a solution to the boundary value problem of mathematical modeling of unsteady oil flow through a trunk pipeline in the presence of internal concentrated pressure sources in the form of functions describing the dependences on time and spatial coordinates of pressures and average cross-section pipeline oil flow rates. To represent the solution of the boundary value problem in the form of convolution integrals, Green's functions and standardizing functions are obtained, which makes it possible to use non-smooth (discontinuous) dependencies to describe programs for changing the values of internal concentrated pressure sources over time. The solutions obtained make it possible to use the methods of the theory of optimal control of systems with distributed parameters to solve the problems of optimal control of the process of pipeline transportation of oil.

Vestnik of Samara State Technical University. Technical Sciences Series. 2022;30(4):6-19
pages 6-19 views
Modeling and digital twin
Lichtsinder B.Y., Olberg P.A.
Abstract

This article considers various types of modeling and the concept of "digital double", as well as their examples of the concept of implementation. For example, computer simulations not only provide a prediction, but also identify which control effects on the system will lead to favorable developments between the link components of the model. In this case, digital simulation allows to optimize the service sequence of sensor elements SE with its time-bound, ensuring minimization of flight time and unconditional absence of complete battery discharge of any of the sensor elements. In this case, the model interacts with the network being modeled, constantly receiving from it up-to-date information about the state, which is characteristic of «digital duplicates». Digital doubles can display not only the characteristics of individual devices, but also process characteristics. Modern production processes are very complex and distributed in space and time. Models of such processes should therefore consider the distributed nature of the modelling objects. The interaction of the digital model with the model object representing the production process is also analyzed. The interaction takes place through integration tools that link the model with the model object.

Vestnik of Samara State Technical University. Technical Sciences Series. 2022;30(4):20-32
pages 20-32 views
Adaptive control system for the water temperature at the outlet of the waste boiler
Lysenko D.S.
Abstract

The experience of developing an adaptive system for controlling the temperature of network water at the outlet of a waste heat boiler is considered. When developing an adaptive control system, a number of sequential control problems were solved: creating a nonlinear model of a waste heat boiler based on a recurrent neural network, studying the frequency characteristics of a neural network model, identification structure and parameters of a control object, synthesizing a typical controller, creating an algorithm for adapting the parameters of a typical controller based on a fuzzy logic. A waste heat boiler is considered as a control object. The control object is represented by a multidimensional thermodynamic system with non-linear characteristics. Training and verification of the neural network model was carried out on the data obtained during the operation of the boiler. Identification of the structure and parameters of the control object is carried out according to the frequency response of the neural network model of the boiler. The algorithm for adapting the parameters of a typical controller contains sets of parameters of a typical controller for different states of the system with different bandwidths. The article presents a description of the stages of synthesis of an adaptive control system, the results of studying a neural network model in the frequency domain, the results of identifying a control object, calculating the parameters of a typical controller for different system states, describing a fuzzy adaptation algorithm, and modeling results.

Vestnik of Samara State Technical University. Technical Sciences Series. 2022;30(4):33-48
pages 33-48 views
Simulation models based on Petri nets for the analysis of maintenance and repair processes of complex technical systems
Orlov S.P., Susarev S.V.
Abstract

The presented review analyzes the approaches and methods of using simulation models in the maintenance and repair organization of the complex technical objects and systems. The development of the concept of "Industry 4.0" and the Internet of things involves the transition from periodic and preventive maintenance to predictive maintenance based on the study of processes during the object operation. It is shown that system models based on Petri nets are convenient for describing and analyzing technological processes and equipment maintenance. The effectiveness of timed stochastic colored Petri nets for virtual tests in the design of maintenance and repair procedures in complex systems is revealed. The use of hierarchical Petri nets allows building complex models that describe interrelated processes. A general model based on a hierarchical network is proposed to study the processes of deterioration and degradation of the technical object aggregates and elements and to form a predictive maintenance strategy. The model includes a Gantt chart of production tasks, a set of active and reserve units, maintenance and repair modules. The examples of simulation models on Petri nets for various technical systems are considered. Solutions for flexible production systems, railway bridges, offshore wind turbines, an aircraft fleet, a group of robotic vehicles, and a complex of computer equipment of an enterprise are given. The models of various maintenance strategies are considered and the generality of the models based on hierarchical Petri nets is shown. The article formulates methodological principles for constructing hierarchical networks to simulate the operation and maintenance of technical systems. The article analyzes known software tools for the implementation of timed stochastic colored Petri nets. The summary concludes that the use of simulation models on Petri nets is promising for organizing maintenance and repair of complex technical objects and systems.

Vestnik of Samara State Technical University. Technical Sciences Series. 2022;30(4):49-75
pages 49-75 views

Electronics, Photonics, Instrumentation and Communications

Development of active heat-protective materials for information-measuring devices and systems experiencing thermal loads in emergency situations
Aldebenev N.S., Toneev I.R., Zhuravleva E.S., Demoretsky D.A.
Abstract

The article deals with the problem of creating a t-protective coating for information-measuring devices and systems for various purposes exposed to external high-temperature exposure in emergency situations related to fire. As a solution to the problem, it is proposed to use thermal-protective materials containing active additives that provide a thermal-protective effect that promotes the refraction of heat flows aimed at heating the protected object. The heat-shielding effect is provided by an endothermic reaction that occurs in the material when the decomposition temperature of the selected component is reached. It should be noted that the temperature at which the reaction with heat absorption should occur should be lower than the temperature of the lesion of the protected object. In this case, the heat flows passing through the layer of heat-shielding material will be refracted, since heat will be spent on the decomposition of the endothermic filler. The heating of the material will be carried out due to the matrix of the material and decomposition products. Based on the tasks that require the use of a heat-protective material, the amount of endothermic filler is determined. Accordingly, with an increase in the time interval during which it is necessary to eliminate the fire, the content of endothermic filler also increases. The use of thermal-protective material is relevant for emergency flight data recorders, since in the event of a plane crash, a fire is likely to occur, which can lead to the loss of information necessary to determine the causes of an emergency.

Vestnik of Samara State Technical University. Technical Sciences Series. 2022;30(4):76-86
pages 76-86 views

Energy and Electrical Engineering

Electro-hydrodynamic processes in an electromagnetic silicon crystallizer
Bazarov A.A., Navasardyan A.A.
Abstract

In this publication, the issues of computer simulation of electromagnetic and hydrodynamic processes in an electromagnetic crystallizer mold of a silicon melt of periodic action are considered. The crystallization process proceeds under conditions of additional heating by eddy currents in the melt. The main task of the electromagnetic interaction of currents in the melt and the inductor field is to create a repulsive force to exclude mechanical contact between silicon and the lining surface. When this problem is solved, heat is released in the melt and a vector of forces is formed, which leads to mixing of liquid silicon. These processes affect the transfer of heat between the lower, upper and side surfaces of the cylinder, the shape of which is taken by the melt. To improve the quality of the crystal structure of the ingot, a temperature gradient is formed by controlling heat flows due to the thickness of the lining walls, heating the upper surface and removing heat from the lower base.

The appearance of a perturbing action under these conditions can upset the balance of heat flows and lead to the creation of thermal stresses in the ingot, accompanied by microcracks. Simultaneous modeling of all processes occurring in an electromagnetic silicon crystallizer is currently unrealizable on a personal computer.

When modeling the process of hydrodynamics in the melt, several geometry options were considered, starting from the maximum volume of the liquid phase and ending with a thin upper layer in the upper part. With a conical shape of the inductor, the distribution of the force vector in the melt depends on the axial coordinate, which leads to a significant decrease in the velocity components as the thickness of the liquid phase decreases. The results of the study showed a rapid decrease in the mixing effect as the thickness of the liquid layer of silicon decreases with a slight change in the overall parameters of the crystallization process.

Vestnik of Samara State Technical University. Technical Sciences Series. 2022;30(4):87-101
pages 87-101 views
Designing of traction motor stators core
Zubkov Y.V., Vereshagin V.E.
Abstract

Electric drive is widely used in automotive practice. Its basis is an electric traction motor (TM), which, compared with an internal combustion engine (ICE), has such advantages as high efficiency, high overload capacity, a wide range of speed control, and the possibility of torque direct transmission to the drive wheels. The main requirements for a traction motor are high efficiency over the entire load range, ease of speed and torque control, high overload capacity, small weight and dimensions, regenerative braking capability, wide speed control range, simplicity and ease of maintenance. The most widely used as traction motors are synchronous electric machines with excitation from permanent magnets (PM). They are characterized by high torque density, efficiency and power consistency over a wide speed range. However, there are a number of problems that hinder the introduction of these electric machines in the traction drive of home cars, one of which is the lack of a methodology for choosing the design of an armature and an inductor at the stage of calculating the main dimensions of an TM with magnetoelectric excitation, taking into account the variety of schemes and methods of winding, PM placement in the inductor. The article deals with the issues of choosing electromagnetic loads for various cooling methods, the size of the non-magnetic gap, an algorithm for electromagnetic calculation based on the maximum torque, containing a number of refining cycles, is proposed. The values of inductances and design factors are determined by numerical simulation of the magnetic field. The features of the design and circuit design of the core and armature winding are considered. Distribution curves of magnetomotive forces of distributed and concentrated windings are obtained, their harmonic analysis is made, recommendations are given on the configuration of the TD armature active zone.

Vestnik of Samara State Technical University. Technical Sciences Series. 2022;30(4):102-114
pages 102-114 views
Justification of the feasibility of use of frequency converters in control stations of submersible centrifugal pumps
Starikov A.V., Kazantsev A.A., Kosorlukov I.A.
Abstract

The article considers the problem of determining the conditions under which the use of a frequency converter in a submersible pump control station leads to a reduction in electrical energy costs and becomes efficient from an energy point of view. Analytical expressions are given that allow calculating the specific costs of electrical energy during artificial lift oil production for the case when the operating mode and well flow rate are provided by wellhead choke throttling. At the same time, special attention is paid to determining the rotation speed of the submersible asynchronous motor, which ensures the required location of the operating point on the pump pressure characteristic. Formulas are also given that make it possible to calculate the specific costs of electrical energy during artificial lift oil production for the case when the operating mode and well flow rate are set by the frequency converter of the control station. An analytical expression has been found to determine the rotation speed and frequency of the supply voltage, which provide the required operating point of the pump with frequency regulation of the submersible motor. It is proposed, using the above analytical expressions, to use the iterative method to calculate the pump performance, at which the specific energy costs for the production of a cubic meter of liquid will be equal both in the case of using a frequency converter in the control station and without it. An example of calculating such a boundary value of pump performance for a hypothetical well is given. It is shown that a decrease in the required flow rate relative to the limiting value of the pump performance leads to a decrease in the specific consumption of electrical energy during artificial lift oil production in the case of using a frequency converter in the submersible pump control station.

 

Vestnik of Samara State Technical University. Technical Sciences Series. 2022;30(4):115-126
pages 115-126 views
Efficiency coefficients of the energy storage device in the contact network of the city electric transport
Katsay A.V., Shevlyugin M.V.
Abstract

The efficiency of stationary and on-board energy storage devices in the contact network of mountain electric transport (tram, metro) is considered. The efficiency coefficients of storage devices are derived depending on the completeness of consideration of storage systems and methods of their application. In accordance with the established formulas for calculating different types of efficiency, the operation indicators of domestic energy storage devices of various types on mountain electric transport are analyzed. It has been established that, other things being equal, stationary energy storage devices are more efficient than those of the on-board version.

Vestnik of Samara State Technical University. Technical Sciences Series. 2022;30(4):127-141
pages 127-141 views
Power supply reactive power factor control as a function of consumer power and losses in transformers
Kotenev V.I., Kotenev A.V., Stulov A.D.
Abstract

The system of automatic control of the reactive power factor of the enterprise's power supply system is considered, in which one part of the transformer substations is equipped with adjustable capacitor units, and the second is not. Its advantage in comparison with the power factor control system is shown, firstly, lower requirements for its error and, secondly, the calculation of the consumer with the supplier for electricity is made taking into account the ratio of reactive energy to active energy. An estimate of the error of regulation of the reactive power factor on the higher voltage side of the transformers of the main step-down substation, where settlement meters are installed, is given, with stabilization of the reactive power factor on the low voltage side of these transformers. The synthesis of the system of automatic control of the reactive power factor, built as a function of the power of consumers and power losses in transformers, and the estimation of its error are considered. The proposed control system is intended for power supply systems with a combined load, the use of which will allow the consumer to avoid penalty coefficients to the tariff for active electricity, and ultimately reduce losses in the transmission of electricity and increase the transmission capacity of the electrical network.

Vestnik of Samara State Technical University. Technical Sciences Series. 2022;30(4):142-157
pages 142-157 views

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies