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  8. 43-3

Electronic modeling

Vol 43, No 3 (2021)

 

CONTENTS

Mathematical Modeling and Computation Methods

  VLADIMIRSKY A.A., VLADIMIRSKY I.A.
Correlation Parametric Methods for Determiningthe Coordinates of Leaks in Underground Pipelines
3-16
  SHEVCHENKO S.S.
Mathematical Modelling of Dynamic System Rotor – Groove Seals
17-35

Computational Processes and Systems

  MARTYNIUK T.B. , KRUPELNYTSKYI L.V., MYKYTIUK M.V., ZAITSEV M.O.
Systolic Architectureof Matrix Processor for Classifier Of Objects		 36-46

Application of Modeling Methods and Facilities

  EVDOKIMOV V.A.
Formulation of the Problem of Constructing a Multia-Gent SimulationModel of Pricing Processes in the Electricity Market
47-63
  SAKOVYCH L., GNATIUK S.,HODYCH O., MARTUSENKO Y.
Research of Diagnostic Models of Radioelectronic Equipment
64-74
  PLESKACH B.M., SAMOILOV V.D.
Computer Scenario-Precedent Technology Treining of Energy Managers
75-86
  KRAVTSOV G.A., KRAVTSOVA N.V., KHODAKOVSKAYA O.V., NIKITCHENKO V.V.,PRYMUSHKO A.N.
Brain Mathematics and Language. I
87-108
  ZINOVIEVA I.S., ZEMBITSKA A.G.
The Comparative Characteristic of Modern Online Toolsfor Testing Knowledge in the Process of Distance Learning
109-123

CORRELATION PARAMETRIC METHODS FOR DETERMINING THE COORDINATES OF LEAKS IN UNDERGROUND PIPELINES

A.A. Vladimirsky, I.A. Vladimirsky

Èlektron. model. 2021, 43(3):03-16
https://doi.org/10.15407/emodel.43.03.003

ABSTRACT

The article is devoted to the development of methods for diagnosing underground pipelines, is the development of the well-known correlation method for determining the coordinates of leaks in the direction of taking into account complications that introduce a multiplicity of types of waves and damage in conjunction with extraneous interference. Development begins with the construction of a diagnostic model of the pipeline section. The presence of damages on it as sources of stationary acoustic noises, multi-wave propagation of these noises to the leak detector sensors, as well as the presence of extraneous, statistically unrelated noises are modeled. The model is designed to formalize the existing complications and build adequate algorithms for their solutions. Then a list of diagnostic parameters is formed, which, in terms of interference distortions, characterizes in magnitude the quality of selection of individual waves, including informative waves of water hammer. The concept of a coordinate shelf as an indicator of the presence of correlation in the calculated spectra of the parameters of correlation functions is presented. The relationship of complications with these parameters is analyzed, conclusions are drawn regarding their further use.

KEYWORDS

pipeline, wave, correlation, model, leak.

REFERENCES

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  4. Vladimirsky, A.A. and Vladimirsky, I.A. (1999), “Peculiarities of vibration signals propagation through pipelines of heating networks of large diameter”, Modelyuvannya ta informatsiyni tekhnolohiyi, Vol. 3, pp. 37-41.
  5. Vladimirsky, A.A., Vladimirsky, I.A. and Semenyuk, D.N. (2005), “Refinement of the diagnostic model of the pipeline to increase the reliability of leak detection”, Akustychnyy visnyk Instytutu hidromekhaniky NAN Ukrayiny, 3, no 8, pp. 3-16.
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  12. Vladimirsky, A.A. (2019), “Parametric methods for diagnostics of underground pipelines taking into account of multiwave propagation of information signals”, Elektronne mode­lyuvannya, Vol. 41, no 1, pp. 3-17.
    https://doi.org/10.15407/emodel.41.01.003
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Mathematical modelling of dynamic system rotor — groove seals

S.S. Shevchenko, PhD in Technical Sciences
Pukhov Institute for Modelling in Energy Engineering
of the National Academy of Sciences of Ukraine
15, General Naumov Str. Kiev, 03164, Ukraine
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Èlektron. model. 2021, 43(3):17-35
https://doi.org/10.15407/emodel.43.03.017

ABSTRACT

Groove seals are considered as hydrostatic bearings that capable of effectively damping rotor vibrations. In order to determine the dynamic characteristics, a model of the rotor–groove seals system is considered. The radial forces and moments in groove seals had been estimated. Expressions of joint radial-angular rotor vibrations in groove seals had been obtained. Formulas had been proposed for constructing amplitude and phase frequency characteristics. An example of calculating the dynamic characteristics of a centrifugal machine rotor model is given.

KEYWORDS

seals-bearings, radial-angular oscillations, frequency characteristics.

REFERENCES

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  3. Martsynovskyi, V.A. (2005), Shchelevyye uplotneniya: teoriya i praktika [Groove seals: theory and practice], Izd-vo Sumskogo univesiteta, Sumy, Ukraine.
  4. Martsynovskyi, V.A. (1995), “Radial-angular oscillations of the centrifugal machine rotor in the groove bearings-seals”, Zeszyty naukowe politechniki Swiętokrzyskiej, pp. 247-259.
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  7. Kundera, Cz. and Marcinkowski, W. (2010), “The effect of the annular seal parameters on the dynamics of the rotor system”, Journal of Applied Mechanics and Engineering, Vol. 15, no 3, pp. 719-730.
  8. Marcinkowski W. and Kundera Cz. (2008), Teoria konstrukcji uszczelnien bezstykowych [The theory of construction of non-contact seals], Wyd-wo Politechniki Swiętokrzyskiej, Kielce, Poland.
  9. Yamamoto Т. and Ishida Y. (2001), Linear and nonlinear rotor dynamics. A modern treatment with applications, John Willey&Sons, New York, USA.
  10. Martsynovskyi, V.A. (2012), Dinamika rotorov tsentrobezhnykh mashin [Dynamics of the centrifugal machine rotors], Izd-vo Sumskogo univesiteta, Sumy, Ukraine.

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SYSTOLIC ARCHITECTURE OF MATRIX PROCESSOR FOR CLASSIFIER OF OBJECTS

T.B. Martyniuk, L.V. Krupelnytskyi, M.V. Mykytiuk, M.O. Zaitsev

Èlektron. model. 2021, 43(3):36-46
https://doi.org/10.15407/emodel.43.03.036

ABSTRACT

One of the known methods of object classification is considered, in which the criterion of classification by the maximum of discriminant functions is realized. This method has found effective application as a classical computational model, in particular in the medical diagnosis of diseases. The process of classification by this method can be implemented as spatially distributed processing on columns and rows of the matrix, which can be described as regular iterative algorithms. This allows you to display them on a two-dimensional systolic array of the matrix processor as part of the classifier of objects with subsequent placement in the FPGA. The proposed matrix processor works in two modes and has a number of specific properties, such as performing the decrement operation simultaneously for all elements in each column of the processor matrix, as well as the use of zero signal (zero) of elements in each row and each matrix column as a result of processing of discriminant functions and for synchronization of the process. In the future, based on the results of processing in the matrix processor, the output signals of the classifier are formed with the definition of a specific class of objects.

KEYWORDS

systolic architecture, discriminant function, classifier of objects.

REFERENCES

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FORMULATION OF THE PROBLEM OF CONSTRUCTING A MULTIAGENT SIMULATION MODEL OF PRICING PROCESSES IN THE ELECTRICITY MARKET

V.A. Evdokimov

Èlektron. model. 2021, 43(3):47-64
https://doi.org/10.15407/emodel.43.03.047

ABSTRACT

Based on the analysis of literature sources, the key scientific and practical tasks of improving and developing the pricing system of the current model of the electricity market in Ukraine "Competition at all levels" have been identified. The formulation of the problem of building a multi-agent simulation model of the pricing process in the electricity market as a complex dynamic system of decentralized interaction between manufacturing agents, wholesale and retail suppliers, energy traders and aggregate electricity consumers is considered.

KEYWORDS

simulation model, multiagent environment, electricity market, pricing.

REFERENCES

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