2687-0517 14 4 2021 1-84

RAR RUS 7-14 Salahaddin University Assim Ara Abdulsatar araabdulsattar@gmail.com

Erbil, Iraq

The quadrature processing techniques used in spectral analysis, computer graphics, and digital communications constantly demand high-speed calculation of the magnitude of a complex number (vector V) given its real and imaginary parts. The aim of this work is designing a digital signal processor (DSP processor) for approximating magnitude and arctangent (phase) of vectors (and/or complex numbers). This work can be divided into three main stages. Firstly, a mathematical model is designed in Simulink, then using that model. Secondly, Verilog description code is generated. The code is used to perform logic synthesis (converting the description code into logic gates) using XT018 technology (180 nm BCD-on-SOI) from X-FAB. Lastly, an ASIC (Application Specific Integrated Circuit) is created from the logic gates. The inputs and outputs of the device are fixed-point numbers, their length is equal to 16 bits and the fraction length is 8 bits. The proposed system can calculate magnitude and phase with an error of less than 1 and 0.35 % respectively. 10.18721/JCSTCS.14401 621.3.049.774 alpha max plus beta min algorithm arctangent approximation fast magnitude approximation digital signal processing DSP processor https://infocom.spbstu.ru/article/2021.71.1/

RAR RUS 15-28 National Research University of Electronic Technology Zaytsev Andrey andazaitsev@mail.ru

Moscow, Russian Federation

Research on phase-frequency detector algorithms for fast locking PLL frequency synthesizers Methods of accelerating transient processes in frequency synthesizers based on a pulse phase-locked loop (PLL) using a coarse accelerating control before the PLL reaches small frequency errors with subsequent accurate phase control are briefly considered. To determine the need to turn on the coarse accelerating control, phase-frequency detectors (PFD) with saturation states are used. The article discusses four well-known algorithms of the PFD, which differ from each other in the conditions and direction of exit from the saturation states. It is shown that without changing the specifications of the elements of the PLL in saturation states, none of the algorithms of the PFD has any significant advantage. When changing the specifications of the elements of the PLL, the algorithm of the PFD, which, upon exiting the saturation states, goes into phase control of the opposite action, immediately after exiting the saturation states has more effective error elimination and, therefore, a more optimal resulting transient process. 10.18721/JCSTCS.14402 621.374.4: 681.5.04 синтезатор сетки частот фазовая автоподстройка частоты ускорение переходного процесса частотно-фазовый детектор алгоритм перехода состояний https://infocom.spbstu.ru/article/2021.71.2/

RAR RUS 29-36 Peter the Great St. Petersburg Polytechnic University Panovitsin Nickita panovitsyn88@gmail.com

St. Petersburg, Russian Federation

Balashov Evgeny balashov_ev@mail.ru High linearity up-conversion mixer Mixer is a fundamental block of the transmitter path exerting great influence on the transmitter linearity level. This article is concerned with a method to enhance the linearity of the Gilbert cell mixer using several parallel-connected differential pairs in an attempt to reduce a variation in incremental transconductance with respect to an input signal amplitude. As part of the study, a Gilbert cell with two parallel-connected differential pairs and a Gilbert cell with three parallel-connected differential pairs were designed and simulated. Both concepts demonstrate an increase in OIP3 value in comparison with a classical Gilbert cell. We used a Si-Ge component library with a design rule of 130 nm. The simulations were conducted in the CAD Advanced Design System. 10.18721/JCSTCS.14403 621.374.44 mixer Gilbert cell BiCMOS nonlinear distortion multi-tanh principle OIP3 https://infocom.spbstu.ru/article/2021.71.3/

RAR RUS 37-51 Shashikhin Vladimir Budnik Svetlana budnik.sveta@mail.ru Peter the Great St. Petersburg Polytechnic University Golovina Kseniya golovina.ko@gmail.com

St. Petersburg, Russian Federation

Control of the spectrum of Lyapunov characteristic exponents in nonlinear large-scale systems The article deals with the control problem for a large-scale nonlinear system with chaotic dynamics based on a centralized and decentralized controller structure. The control is based on the feedback principle, which makes it possible to implement in a closed system a given spectrum of Lyapunov characteristic exponents to suppress chaotic dynamics and transfer the system to stable periodic movements or to a state of equilibrium. To change the spectrum, a modal control procedure is proposed, generalized for nonlinear large-scale systems. An example of the application of this technique to suppress chaotic oscillations in a system consisting of three synchronous generators is considered. Computational experiments confirm the workability of centralized and decentralized management. The article considers the use of the proposed method for the synthesis of decentralized control through the example of a system consisting of three synchronous generators. The results of the study confirmed the suppression of chaotic oscillations and the provision of a regular mode in a closed system. The advantage of the proposed decentralized control is the reduction of computational costs for the synthesis and implementation of control systems for large-scale systems. 10.18721/JCSTCS.14404 519.8 nonlinear large-scale systems deterministic chaos control of the spectrum of Lyapunov characteristic exponents modal control Sylvester’s matrix algebraic equation https://infocom.spbstu.ru/article/2021.71.4/

RAR RUS 52-60 Reshetnev Siberian State University of Science and Technology Shurinova Darya dasha.shurinova@yandex.ru

Krasnoyarsk, Russian Federation

Development of a new methodology for acceptance testing of refrigeration appliances Each manufactured refrigerator must be subject to acceptance testing to make sure every single unit complies with the heat and power characteristics prescribed by the state standard for each individual type of refrigerators (the types differ in the number of chambers, the number of compressors, etc.). The standard indicates only the parameters that the device must comply with, while the testing method is not regulated and is chosen by the manufacturer in accordance with the specifics of production or is developed by the manufacturer independently. The object of this work is the possibility of using a new technique for measuring the heat-and-power characteristics of the device. Based on the results of the comparative analysis with the existing methods, the differences of the new method are indicated, the advantages of its use are given in comparison with the existing and currently used control methods in Russia and other countries. Considering the comparative characteristics, such advantages of the new technique as saving production space, exclusion of the human factor, saving energy costs were found. 10.18721/JCSTCS.14405 62-50 refrigerator thermal power characteristics consumed electric power acceptance test test procedure https://infocom.spbstu.ru/article/2021.71.5/

RAR RUS 61-66 Hanafi M. Yassine hanafi.med.yassine@gmail.com AAH-8784-2019 35303230700 Peter the Great St.Petersburg Polytechnic University Vyacheslav P. shkodyrev@imop.spbstu.ru

Polytechnicheskaya, 29, St.Petersburg, 195251, Russia

Hierarchical Pareto optimality approach for intelligent control system in oil manufacturing In this paper, we present a hierarchical Pareto optimization approach for an optimal control system of a complex dynamic hierarchical oil refinery system. Due to the hierarchical structure of the oil refinery, the standard Pareto principle can solve the multi-objective optimization problem of one process without considering the impact of the results on the other processes, since our goal is to achieve the optimal control for the whole system. Each subsystem contains a process, which is considered as a sequence of processes leading to production based on the previous process. The hierarchy Pareto principle is used to select the optimal control variables in the control system. The application of the hierarchical Pareto principle to the process of oil refining is more significant in the selection of control variables used in the system. The results of the system are presented in the form of a set of configurations described as the Pareto front of a system with hierarchical structure. The Pareto principle in this work can be used as a tool for control systems in complex and dynamic systems. The proposed approach is part of a larger project using a multi-agent system based on Deep Reinforcement Learning that allows each agent to adapt to the process. 10.18721/JCSTCS.14406 004 Pareto front multi-objective optimization neural network machine learning oil refinement https://infocom.spbstu.ru/article/2021.71.6/

RAR RUS 71-83 Moscow State University of Technology “STANKIN” Zelensky Alexandr zelenskyaa@gmail.com

Moscow, Russian Federation

Moscow State University of Technology “STANKIN” Morozkin Marian m.morozkin@stankin.ru

Moscow, Russian Federation

Moscow State University of Technology “STANKIN” Panfilov Anton a.panfilov@stankin.ru

Moscow, Russian Federation

Moscow State University of Technology “STANKIN” Kuptsov Vladimir v.kuptsov@stankin.ru

Moscow, Russian Federation

Moscow State University of Technology “STANKIN” Gribkov Andrey andarmo@yandex.ru

Moscow, Russian Federation

Ensuring confidence in control systems of technological equipment The article considers a complex problem of providing confidence in the used control systems of technological equipment, developed in Russia in conditions of technological backwardness and high dependence on imports of complete control systems, their components and software. A methodology for the system representation of confidence in technological equipment control systems, based on the description of confidence in the system comprising confidence in its constituent quasi-autonomous elements, is investigated. The authors disclose a sequence of quantitative assessment of confidence, determined from the confidence in the results of the development and testing of control systems, their components and software from the viewpoint of functional reliability and information security. Possibilities of increasing confidence in control systems are considered, and the problem of providing functional reliability and information security is analyzed. As part of the study of the problem of information security of control systems of technological equipment, threats associated with vulnerabilities and malware are considered. In addition, the study systematizes undocumented features and considers methods for their detection. 10.18721/JCSTCS.14407 004.05 trust functional reliability information security testing undocumented features vulnerabilities software and hardware implementations https://infocom.spbstu.ru/article/2021.71.7/