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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">vestifm</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-математических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-2430</issn><issn pub-type="epub">2524-2415</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-2430-2019-55-2-182-194</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-385</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>МАТЕМАТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICS</subject></subj-group></article-categories><title-group><article-title>Способы нахождения точного числа предельных циклов автономных систем на цилиндре</article-title><trans-title-group xml:lang="en"><trans-title>Ways for detection of the exact number of limit cycles of autonomous systems on the cylinder</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>Гринь</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Hryn</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гринь Александр Александрович – доктор физико-математических наук, доцент, заведующий кафедрой математического анализа, дифференциальных уравнений и алгебры</p><p>ул. Ожешко, 22, 230023, г. Гродно, Республика Беларусь</p></bio><bio xml:lang="en"><p>Aliaksandr A. Hryn – Dr. Sc. (Physics and Mathematics), Assistant Professor, Head of the Department of Mathematical Analysis, Differential Equations and Algebra</p><p>22, Ozheshko Str., Grodno, 230023, Republic of Belarus</p></bio><email xlink:type="simple">grin@grsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рудевич</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Rudzevich</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рудевич Сергей Вячеславович – аспирант</p><p>ул. Ожешко, 22, 230023, г. Гродно, Республика Беларусь</p></bio><bio xml:lang="en"><p>Searhei V. Rudevich – Postgraduate Student</p><p>22, Ozheshko Str., Grodno, 230023, Republic of Belarus</p></bio><email xlink:type="simple">serhiorsv@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Гродненский государственный университет им. Я. Купалы</institution></aff><aff xml:lang="en"><institution>Yanka Kupala State University of Grodno</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>28</day><month>06</month><year>2019</year></pub-date><volume>55</volume><issue>2</issue><fpage>182</fpage><lpage>194</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Гринь А.А., Рудевич С.В., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Гринь А.А., Рудевич С.В.</copyright-holder><copyright-holder xml:lang="en">Hryn A.A., Rudzevich S.V.</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://vestifm.belnauka.by/jour/article/view/385">https://vestifm.belnauka.by/jour/article/view/385</self-uri><abstract><p>Для вещественных автономных систем дифференциальных уравнений с непрерывно дифференцируемыми правыми частями рассматривается задача нахождения точного числа и локализации предельных циклов второго рода на цилиндре. В случае отсутствия точек покоя системы на цилиндре для решения указанной задачи развиваются ранее предложенные нами способы, состоящие в последовательном двухшаговом применении признака Дюлака – Черкаса или признака Дюлака. Разработан также новый способ, использующий на втором шаге обобщение признака Дюлака – Черкаса или признака Дюлака, где требование знакопостоянности дивергенции заменяется условием трансверсальности кривых, на которых дивергенция обращается в нуль. С помощью разработанных способов находятся замкнутые трансверсальные кривые, разбивающие цилиндр на подобласти, окружающие его, в каждой из которых система имеет точно один предельный цикл второго рода.</p><p>Практическая эффективность разработанного способа продемонстрирована на примере системы маятникового типа, для которой в случае отсутствия точек покоя доказано существование точно трех предельных циклов второго рода на всем фазовом цилиндре.</p></abstract><trans-abstract xml:lang="en"><p>For real autonomous systems of differential equations with continuously differentiable right-hand sides, the problem of detecting the exact number and localization of the second-kind limit cycles on the cylinder is considered. To solve this problem in the absence of equilibria of the system on the cylinder, we have developed our previously proposed ways consisting in a sequential two-step application of the Dulac – Cherkas test or the Dulac test. Additionally, a new way has been worked out using the generalization of the Dulac – Cherkas or Dulac test at the second step, where the requirement of constant sign for divergence is replaced by the transversality condition of the curves on which the divergence vanishes. With the help of the developed ways, closed transversal curves are found that divide the cylinder into subdomains surrounding it, in each of which the system has exactly one second-kind limit cycle.</p><p>The practical efficiency of the mentioned ways is demonstrated by the example of a pendulum-type system, for which, in the absence of equilibria, the existence of exactly three second-kind limit cycles on the entire phase cylinder is proved.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>автономная система на цилиндре</kwd><kwd>предельный цикл второго рода</kwd><kwd>16-я проблема Д. 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