THE FREQUENCY METHOD FOR OPTIMAL IDENTIFICATION OF CLOSE-LOOP SYSTEM ELEMENTS

Authors

  • S. І. Osadchyi Flight Academy of the National Aviation University, Kropyvnytskyi, Ukraine, Ukraine
  • V. A. Zozulya State University of Trade and Economics, Kyiv, Ukraine, Ukraine
  • V. M. Kalich Central Ukrainian National Technical University, Kropyvnytskyi, Ukraine, Ukraine
  • A. S. Timoshenko Flight Academy of the National Aviation University, Kropyvnytskyi, Ukraine, Ukraine

DOI:

https://doi.org/10.15588/1607-3274-2023-4-18

Keywords:

Identification, transfer function matrix, spectral density, error variance, quality functional

Abstract

Context. The article is devoted to overcoming the contradictions between the assumptions adopted in known methods of closedloop control system identification and the design and conditions of its operation. The article presents a new method of identifying the transfer functions matrix of a two-level closed-loop control system element, which functions under the conditions of multidimensional stationary centered random influences.

Objective. The purpose of the study, the results of which are presented in this paper, is to extend the indirect identification method to the case of estimating one of the two-level closed-loop control system elements’ dynamics model based on passive experiment data.

Method. To solve the optimal identification problem, a variational method for minimizing the quality functional on the class of fractional-rational transfer function matrices was used.

Results. As a result of the research, the identification problem formulation was formalized, the rules for obtaining experimental information about the input and output signals were determined, the rules for identifying the transfer functions matrix of a two-level closed-loop control system element, which minimizes the sum of the variances of identification errors in the frequency domain, and the verification of these rules was carried out.

Conclusions. Justified rules allow to correctly determine transfer functions matrices of the closed-loop systems selected element when fulfilling the defined list of conditions. The closed-loop systems control paths signals analysis proves the possibility of the effect of changing these signals statistical means, even under conditions of only centered stationary input influences actions on the system. Based on this, the further development of research can be aimed at overcoming such effects.

Author Biographies

S. І. Osadchyi, Flight Academy of the National Aviation University, Kropyvnytskyi, Ukraine

Dr. Sc., Professor, of the Department of Aircraft Construction, Aircraft Engines, and Airworthiness Maintenance

V. A. Zozulya, State University of Trade and Economics, Kyiv, Ukraine

PhD, Associate Professor of the Department of Digital Economy and System Analysis

V. M. Kalich, Central Ukrainian National Technical University, Kropyvnytskyi, Ukraine

PhD, Professor of the Department of Automation of Production Processes

A. S. Timoshenko, Flight Academy of the National Aviation University, Kropyvnytskyi, Ukraine

Senior Lecturer of the Department of Aeronautics, Meteorology and Air Traffic Management

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Published

2024-01-04

How to Cite

Osadchyi S. І., Zozulya, V. A., Kalich, V. M., & Timoshenko, A. S. (2024). THE FREQUENCY METHOD FOR OPTIMAL IDENTIFICATION OF CLOSE-LOOP SYSTEM ELEMENTS . Radio Electronics, Computer Science, Control, (4), 195. https://doi.org/10.15588/1607-3274-2023-4-18

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Section

Control in technical systems