Methods of Mathematical Model Synthesis When Designing Microprocessor Control and Automation Systems for Industrial Plants

Author(s):  
V.D. Sartakov
Author(s):  
А.Б. Каракаев ◽  
А.В. Костенко

Статья посвящена сравнению результатов расчётов полиномиальных зависимостей однофазного асинхронного двигателя, полученных с использованием методов планирования эксперимента, с математической моделью построенной с помощью программ на ЭВМ на языке программирования Python. Актуальность работы заключается в том, что задачи аппроксимационного типа не всегда возможно решить, используя ЭВМ, поэтому исследователи часто применяют методы планирования эксперименты для решения таких задач и после уже стоят математическую модель на ЭВМ и проверяют адекватность полученных результатов. В результате в статье авторами предоставляется план проверки адекватности полиномиальных зависимостей однофазного асинхронного электродвигателя без внешних фазосдвигающих устройств для систем судовой автоматики. По итогу выполненной работы авторы приходят к выводу об адекватности построенной математической модели на ЭВМ с использованием языка программирования Python. The article is devoted to the comparison of the results of calculations of polynomial dependencies of a single-phase asynchronous motor, obtained using methods of experiment planning, with a mathematical model built using computer programs in the Python programming language. The relevance of the work lies in the fact that problems of the approximation type are not always possible to solve using a computer, therefore, researchers often use methods of planning experiments to solve such problems and after that they already have a mathematical model on a computer and check the adequacy of the results obtained. As a result, the authors provide a plan for checking the adequacy of the polynomial dependencies of a single-phase asynchronous electric motor without external phase-shifting devices for ship automation systems. As a result of the work performed, the authors come to the conclusion about the adequacy of the constructed mathematical model on a computer using the Python programming language.


Author(s):  
S. M. Babchuk ◽  
B. S. Nezamay

Power Line Communication (PLC) systems are actively evolving and becoming more and more widespread worldwide. They are used in the automation of technological processes, the organization of video surveillance systems and to control the "smart" home. The G3-PLC provides high-speed and high-reliability long-distance communication over the existing power grid. Due to the fact that G3-PLC provides the ability to transmit data including through transformers, infrastructure costs are reduced. In addition, the G3-PLC network can support IPv6, which will allow the G3-PLC to easily integrate into common IPv6-based communication lines in the future. G3-PLC-based bilateral communications networks can provide grid operators with intelligent monitoring and control capabilities. Operators will be able to monitor electricity consumption across the network in real time, apply variable tariff schedules and set limits on electricity consumption. In turn, consumers will be able to control electricity consumption in real time. By using variable tariffs, users can reduce their electricity consumption during peak use. The G3-PLC dedicated digital network can be used in process automation systems where traditional or traditional data transmission is difficult or impossible. As a result of the research, a polynomial mathematical model was found that best reflects the change in data rate depending on the length of the G3-PLC network segment. It is also found that for the simplified calculation, a linear model determined during the studies can be used. The established mathematical models of data transmission rate dependence on the segment length of the G3-PLC dedicated digital network will contribute to better design of G3-PLC-based networks.


2020 ◽  
Vol 13 (3) ◽  
pp. 246-267
Author(s):  
Dmytro Kurhan ◽  
Maksym Havrylov

The condition of a railway track is characterized by many indices, including its geometric shape, both in the horizontal and vertical planes. The purpose of this paper is to create a mathematical tool to ensure the operation of track machines for surfacing, tamping, and alignment, which are equipped with automation systems. The developed mathematical model will be integrated into the AS "Strela" software package which is currently installed on machines. Scientific approaches used in the mathematical model allowed to reduce the operation of machines in "window", to simplify the work of maintenance personnel, to create an information base of track parameters, to establish rational parameters of curves during surfacing.


2004 ◽  
Vol 58 (9) ◽  
pp. 416-422
Author(s):  
Dragan Milenkovic ◽  
Stanisa Stoiljkovic ◽  
D.R. Ilic

Wastewater purification and the acquirement of drinking water from water streams that are in most cases recipients of various industrial plants, present a significant problem nowadays. The structural characteristics of granulated active charcoal (GAC) obtained by the carbonization of coconut shells and activated by steam are presented in this paper. The established kinetics of suspending cyanide from aqueous solution using GAC impregnated with copper(II) acetate were studied and a mathematical model estabkusged by a regression - correlation analysis.


Author(s):  
А.Б. Каракаев ◽  
А.В. Костенко

Статья посвящена разработке методики проектирования однофазного асинхронного электродвигателя без внешних фазосдвигающих устройств для систем судовой автоматики. Отмечается, что существующие на сегодняшний день известные методики расчёта микромашин не учитывает потерь в стали, что приводит к значительным погрешностям при расчёте двигателя. Авторами предлагается применять разработанную уточненную методику расчёта двигателя для дальнейшего его проектирования. Отмечается, что из выявленных в работе зависимостей важнейшей является зависимость пускового момента от электрического угла между осями обмоток 1 и 44 - α. Где выбор не оптимального электрического угла - крайне негативно сказывается на величине пускового момента однофазной микромашины. Для пояснения особенностей определения активной части двигателя авторами строится график зависимости наружной поверхности и потерь от полезной мощности. Также, в статье авторы приводят номограммы, позволяющие принимать проектировочные решения не только на основания расчёта, но и графоаналитическим методом. Результатом работы является получение новой методики расчёта и проектирования однофазной микромашины для систем судовой автоматики, используя для расчёт математическую модель, полученную с помощью методов планирования эксперимента. The article is devoted to the development of a design technique for a single-phase asynchronous electric motor without external phase-shifting devices for ship automation systems. It is noted that the currently known methods for calculating micromachines do not take into account losses in steel, which leads to significant errors in calculating the engine. The authors propose to apply the developed refined methodology for calculating the engine for its further design. It is noted that of the dependences identified in the work, the most important is the dependence of the starting torque on the electric angle between the axes of the windings 1 and 44 - α. Where the choice of a non-optimal electrical angle has an extremely negative effect on the magnitude of the starting torque of a single-phase micromachine. To clarify the features of determining the active part of the engine, the authors build a graph of the dependence of the outer surface and losses on the net power. Also, in the article, the authors provide nomograms that allow making design decisions not only on the basis of calculation, but also by the graphical analytical method. The result of the work is to obtain a new methodology for calculating and designing a single-phase micromachine for ship automation systems, using for the calculation a mathematical model obtained using experimental planning methods.


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