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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">izvestswsu</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Юго-Западного государственного университета</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the Southwest State University</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2223-1560</issn><issn pub-type="epub">2686-6757</issn><publisher><publisher-name>ЮЗГУ</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21869/2223-1560-2021-25-2-83-92</article-id><article-id custom-type="elpub" pub-id-type="custom">izvestswsu-883</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Информатика, вычислительная техника и управление</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Computer science, computer engineering and IT managment</subject></subj-group></article-categories><title-group><article-title>О двухчастотных колебаниях электропривода постоянного тока с импульсным управлением</article-title><trans-title-group xml:lang="en"><trans-title>On Two-Frequency Oscillations of a DC Electric Drive with Pulse Control</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Яночкина</surname><given-names>О. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Yanochkina</surname><given-names>O. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Яночкина Ольга Олеговна, кандидат технических наук, доцент кафедры вычислительной техники </p><p>ул. 50 лет Октября 94, г. Курск 305040</p></bio><bio xml:lang="en"><p>Olga О. Yanochkina, Cand. of Sci. (Engineering), Associate Professor, Department of Computer Science </p><p>50 Let Oktyabrya str. 94, Kursk 305040</p></bio><email xlink:type="simple">yanoolga@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Юго-Западный государственный университет</institution></aff><aff xml:lang="en"><institution>Southwest State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>19</day><month>08</month><year>2021</year></pub-date><volume>25</volume><issue>2</issue><fpage>83</fpage><lpage>92</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Яночкина О.О., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Яночкина О.О.</copyright-holder><copyright-holder xml:lang="en">Yanochkina O.O.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://izvestswsu.elpub.ru/jour/article/view/883">https://izvestswsu.elpub.ru/jour/article/view/883</self-uri><abstract><p>Цель исследования. Анализ бифуркаций двухчастотных колебаний электропривода постоянного тока с широтно-импульсным управлением.Методы. Исследования основаны на построении стробоскопического отображения Пуанкаре, расчете седловых периодических орбит и их устойчивых и неустойчивых инвариантных многообразий.Результаты. Выполнено исследование механизмов возникновения двухчастотных колебаний из теряющего устойчивость периодического движения в электроприводе постоянного тока с широтно-импульсным управлением. Изучена нелокальная седло-узловая бифуркация, приводящая к резонансу (синхронизации) на торе, характеризуемом парой независимых частот, когда их отношение становится рациональным числом.Заключение. Проведен бифуркационный анализ системы управления электроприводом постоянного тока, динамика которой описывается негладкими неавтономными дифференциальными уравнениями. Исследования проводились на итерируемом отображении, полученном из указанного векторного поля в аналитическом виде. Показано, что рассматриваемая система демонстрирует двухчастотные колебания, которые возникают через бифуркацию Неймарка-Саккера. В фазовом пространстве дискретной модели колебаниям с двумя независимыми частотами соответствует замкнутая инвариантная кривая. Показано, что если эти частоты соотносятся кратно, то происходит резонанс, когда динамика становится периодической. Но при этом замкнутая кривая остается инвариантной, а предельные точки орбиты образуют пару периодических циклов – устойчивый и седловой, отвечающих рациональному отношению частот. Замкнутая инвариантная кривая образована неустойчивыми многообразиями седлового цикла. Если же отношение частот иррациональное, то динамика квазипериодическая. Орбиты такого движения всюду плотно заполняют замкнутую кривую.</p></abstract><trans-abstract xml:lang="en"><p>Purpose of research is of the paper is to analyze bifurcations of two-frequency oscillations of a DC electric drive with pulse-width control.Methods. The research is based on the construction of a stroboscopic Poincare map, the calculation of saddle periodic orbits and their stable and unstable invariant manifolds.Results. The study of the mechanisms of the occurrence of two-frequency oscillations from a periodic motion that loses stability in a DC electric drive with pulse-width control was carried out. A non-local saddle-node bifurcation leading to resonance (synchronization) on a torus characterized by a pair of independent frequencies when their ratio becomes a rational number, was studied.Conclusion. A bifurcation analysis of the control system of a DC electric drive, the dynamics of which is described by non-smooth nonautonomous differential equations, was carried out. The research was conducted on an iterable map obtained from the specified vector field in an analytical form. It is shown that the system under consideration demonstrates two-frequency oscillations that occur through the Neimark-Sacker bifurcation. In the phase space of the discrete model, a closed invariant curve corresponds to oscillations with two independent frequencies. It is shown that if these frequencies are correlated multiply, then a resonance occurs when the dynamics becomes periodic. But at the same time, the closed curve remains invariant, and the limit points of the orbit form a pair of periodic cycles – stable and saddle, corresponding to a rational frequency ratio. A closed invariant curve is formed by unstable manifolds of a saddle cycle. If the frequency ratio is irrational, then the dynamics is quasi-periodic. The orbits of such motion fill the closed curve everywhere densely.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>система управления электроприводом</kwd><kwd>бифуркация Неймарка-Сакера</kwd><kwd>замкнутая инвариантная кривая</kwd><kwd>двухчастотные колебания</kwd><kwd>дифференциальные уравнения с разрывной правой частью</kwd></kwd-group><kwd-group xml:lang="en"><kwd>electric drive control system</kwd><kwd>Neimark-Sacker bifurcation</kwd><kwd>closed invariant curve</kwd><kwd>two-frequency oscillations</kwd><kwd>differential equations with discontinuous right-hand side</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена под руководством д-ра техн. наук, профессора, профессора кафедры вычислительной техники ФГБОУ ВО «Юго-Западный государственный университет» Ж.Т. Жусубалиева</funding-statement><funding-statement xml:lang="en">The work was carried out under the guidance of Doctor of Sciences (Engineering), Professor of the Department of Computer Engineering of the Southwest State University Zhusubaliev Zh. T.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Alligood K.T., Sauer T.D., Yorke J. A. Chaos: An Introduction to Dynamical Systems. New York: Springer, 2000. https://doi.org/10.1007/b97589</mixed-citation><mixed-citation xml:lang="en">Alligood K.T., Sauer T.D., Yorke J. A. Chaos: An Introduction to Dynamical Systems. New York, Springer, 2000. https://doi.org/10.1007/b97589</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Parker T. S., Chua L.O. Practical Numerical Algorithms for Chaotic Systems. 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