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 31, No 4 (2023)

Information Technology and Communications

Two-channel optimal energy-efficient control of distributed parameter systems
Ilina N.A.
Abstract

A formulation and method for solving the problem of the energy-efficient two-channel programmed control of an object with distributed parameters with a given-precision uniform approximation of the resulting spatial distribution of the controlled quantity to the required state is proposed. Two internal controls on the power of heat sources in the electromagnetic field of the inductor are considered as control actions. Proposed solution approach involves a special-form preliminary parametrization procedure for control actions on finite-dimensional subsets of the terminal values of conjugate variables in the boundary-value problem of Pontryagin’s maximum principle, in combination with the subsequent reduction to a semi-infinite optimization problem, which is solved with respect to the requisite parameter vector using the alternance method based on additional information about fundamental laws of the subject area. An example of optimal energy-efficient control of transient heat conduction, which is of independent interest, is given.

Vestnik of Samara State Technical University. Technical Sciences Series. 2023;31(4):6-16
pages 6-16 views
Managing the staffing process of the Samara region oil industry
Tuponosova E.P., Livshits M.Y., Golovanov P.A.
Abstract

The problem of constructing dynamic models in the form of differential equations or transfer functions linking the performance indicators of the oil industry of the Samara region with the performance indicators of a regional university with a large institute of oil and gas technologies, considered as the controlling factors of staffing the oil industry, is solved. The input factors of the model are the normative performance indicators of the Samara State Technical University (SamSTU). The effectiveness of the regional oil cluster of the Samara region is assessed by indicators established by the Federal State Statistics Service (Rosstat), in particular, the amount of oil received for processing. For the algorithm of personnel management of the oil industry of the region, the problem of structural and parametric identification of the personnel training process at the university based on statistical characteristics as experimental data is solved. Using the library of typical linear models of management objects by N.S. Raibman, mathematical models of the process of staffing the industry in the form of transfer functions are constructed. Verification of mathematical models is carried out by comparison with official statistical data. On the basis of the obtained transfer functions, the synthesis of algorithms for automatic management of the personnel management process of the regulatory industry in the management decision support system is carried out.

Vestnik of Samara State Technical University. Technical Sciences Series. 2023;31(4):17-33
pages 17-33 views

Energy and Electrical Engineering

Study of electric consumption of individual housing construction facilities of different stories and area
Akhmetshin A.R.
Abstract

In the Russian Federation, the construction of individual housing construction projects is being carried out at an increasing pace, for the construction of electrical networks for which there are no regulatory documents with an adequate methodology for calculating electrical loads. This situation led to low load on power grid equipment, and accordingly, investments became non-refundable. Sustainable development of private and industrial construction of individual housing projects is possible only with the development of regulatory technical documents that meet modern trends. To accomplish this task, research work was carried out to develop regulatory documents used in the design of electrical networks in cottage villages, taking into account the different number of floors and area of individual housing construction projects. Using the example of two cottage villages in Kazan, based on the parameter of daily and monthly electricity consumption, it was possible to obtain a sample whose data obeys the law of normal distribution. The analysis of sample sets of cottages in the villages shows that according to the power consumption parameter they can be grouped depending on the number of floors and area of the houses. The results obtained make it possible to formulate a future methodology for calculating electrical loads with amendments to the Federal Code of Rules.

Vestnik of Samara State Technical University. Technical Sciences Series. 2023;31(4):34-48
pages 34-48 views
Modeling of thermal processes when melting ice on power lines
Bazarov A.A., Budko S.I.
Abstract

An analysis of the problem of ice formation on power line wires was carried out, and a review of work in the field of melting ice on various lines was carried out. Existing achievements and problems are noted. One of the reasons for the low equipment of lines with automated melting systems is the need to transfer the line from the operating state to the melting mode. One way to solve the problem is to combine these modes by loading the line with additional current without increasing the power transmitted to consumers. A set of issues on modeling thermal processes in the ice shell of power line wires during ice melting is considered. Limiting the power of heat generation in wires leads to the need to build a sufficiently accurate mathematical model to guarantee melting at different values of wind speed and temperature. A study of wire heating processes was carried out using models of stationary and non-stationary thermal conductivity. An algorithm is proposed for solving the thermal problem when a heated wire penetrates an ice shell, based on simulating the movement of the interface between the solid and liquid phases of water. The features of modeling the melting and crystallization process using a numerical method are described. When ice transitions to a molten state, melting reflects a change in density and the formation of an air gap, accompanied by a significant decrease in heat flows to the lower region of the ice shell. The results of numerical modeling of the process of melting an ice shell with a wire at different values of the convective heat transfer coefficient are presented. When analyzing the modeling results, conditions were identified for the occurrence of unacceptable overheating of a wire freed from ice. Various options for constructing a control system for the smelting process have been proposed to prevent overheating of the wire.

Vestnik of Samara State Technical University. Technical Sciences Series. 2023;31(4):49-67
pages 49-67 views
Measurement of electrical conductivity of transformer oil based nanofluid
Korobejnikov S.M., Shevchenko V.E., Rydel A.V., Goreva L.P.
Abstract

In this article, an attempt was made to evaluate the electrical conductivity of a nanofluid based on transformer oil. For this purpose, several nanofluid samples with different concentrations of dielectric silicon dioxide nanoparticles and conductive zinc nanoparticles were prepared. The dielectric permittivity and electrical conductivity of the obtained nanofluids were measured experimentally. After processing the experimental results, a theoretical calculation was made using the Nielsen formula. After the calculation, the results were compared with the experimental data. In the process of comparative analysis, the correspondence of the calculated and experimental values of the dielectric permittivity was noted. There was also a discrepancy between the experimental and calculated values of electrical conductivity. An explanation is proposed for the discovered discrepancy between the calculated and experimental values. Presumably, the main reason for the decrease in electrical conductivity in the experiment is the adsorption of ion particles in the dielectric.

Vestnik of Samara State Technical University. Technical Sciences Series. 2023;31(4):68-79
pages 68-79 views
Investigation of the thermal regime of a linear DC motor
Makarichev Y.A., Ratzev Y.A.
Abstract

Linear DC motors (LDPT) with a limited armature stroke are used in mechanisms that reciprocate the working body or stabilize its position in tracking systems. The use of LDPT instead of rotary motion motors with a converter in the form of a crank mechanism, a screw pair or other similar mechanical systems leads to a significant simplification of the kinematic scheme, increased efficiency and, as a rule, increased accuracy of the complex and its reliability. There are a number of problems in the creation of LDPT, which are not fully reflected in the scientific and technical literature. In particular, with parametric optimization of the engine according to weight, size and energy criteria, one of the main limiters is overheating of the winding, and in magnetoelectric machines, also overheating of permanent magnets, which are very sensitive to the magnitude of the operating temperature and thermal shocks. The article presents an analytical method for calculating the thermal state of an engine in steady state, based on the method of thermal substitution schemes. The technique is designed for use in a parametric optimization program. To clarify the values of the a priori coefficients in the analytical expressions of the proposed algorithm, the authors modeled the LDPT using the numerical finite element method. Based on the simulation results, a picture of the temperature field of the machine was obtained and the critical heating areas were determined. Verification of the theoretical provisions was carried out during experimental studies of the prototype engine. The tests showed good convergence of the calculated and experimental parameters.

Vestnik of Samara State Technical University. Technical Sciences Series. 2023;31(4):80-93
pages 80-93 views

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