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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">matmess</journal-id><journal-title-group><journal-title xml:lang="ru">Математические заметки СВФУ</journal-title><trans-title-group xml:lang="en"><trans-title>Mathematical notes of NEFU</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2411-9326</issn><issn pub-type="epub">2587-876X</issn><publisher><publisher-name>Северо-Восточный федеральный университет имени М.К. Аммосова</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25587/SVFU.2023.93.57.002</article-id><article-id custom-type="elpub" pub-id-type="custom">matmess-11</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></article-categories><title-group><article-title>Аналитическое решение задачи о гармонических колебаниях тела прямоугольной формы в микрополярной теории упругости</article-title><trans-title-group xml:lang="en"><trans-title>A problem of harmonic oscillations of a rectangle in the theory of micropolar elasticity: the analytical solution</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>Григорьев</surname><given-names>Ю. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Grigor’ev</surname><given-names>Yu. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Григорьев Юрий Михайлович</p><p>ул. Кулаковского, 48, Якутск 677000</p><p>пр. Ленина, 33, Якутск 677007</p></bio><bio xml:lang="en"><p>Yuriy M. Grigor’ev</p><p>58 Belinsky Street, Yakutsk, 677000 Russia</p><p>33 Lenin Avenue, Yakutsk 677007, Russia.</p></bio><email xlink:type="simple">grigyum@yandex.ru</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>Гаврильева</surname><given-names>A. A.</given-names></name><name name-style="western" xml:lang="en"><surname>Gavrilieva</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гаврильева Aнна Aндреевна</p><p>ул. Октябрьская, 1, Якутск 677980</p></bio><bio xml:lang="en"><p>Anna A. Gavrilieva</p><p>1 Oktyabrskaya street, Yakutsk 677980, Russia</p></bio><email xlink:type="simple">gav-ann@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Северо-Восточный федеральный университет имени М. К. Аммосова; Академия наук Республики Саха (Якутия)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ammosov North-Eastern Federal University, Theoretical Physics Department; Academy of Sciences of the Republic of Sakha (Yakutia)</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФИЦ «Якутский научный центр СО РАН», Обособленное подразделение Институт физико-технических проблем Севера им. В. П. Ларионова СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Larionov Institute of the Physical-Technical Problems of the North of the Siberian Branch of the RAS, Division of Federal Research Centre "The Yakut Scientific Centre of the Siberian Branch of the Russian Academy of Sciences"</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>30</day><month>06</month><year>2023</year></pub-date><volume>30</volume><issue>2</issue><fpage>14</fpage><lpage>29</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Григорьев Ю.М., Гаврильева A.A., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Григорьев Ю.М., Гаврильева A.A.</copyright-holder><copyright-holder xml:lang="en">Grigor’ev Y.M., Gavrilieva A.A.</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://matmess.elpub.ru/jour/article/view/11">https://matmess.elpub.ru/jour/article/view/11</self-uri><abstract><p>Рассматривается плоская задача о собственных гармонических колебаниях прямоугольника со смешанными краевыми условиями в рамках линейной микрополярной теории упругости. Микрополярная модель или модель Коссера применяется для многих современных материалов с микроструктурой, когда элементарная частица сплошной среды имеет шесть степеней свободы. Предложен метод решения, когда исходная краевая задача разделяется на отдельные последовательности согласованных скалярных краевых задач, отвечающих и за вращательную компоненту. Выявлено, что в микрополярной среде возникают два «сорта частот» собственных колебаний прямоугольника, одна из которых ограничена снизу, тогда как в классической среде существует только один «сорт» собственных частот и таких ограничений нет. Предложенный метод может быть развит на случай других граничных условий и на трехмерный случай.</p></abstract><trans-abstract xml:lang="en"><p>We consider the plane problem of natural harmonic oscillations of a rectangle with mixed boundary conditions in the framework of the linear micropolar theory of elasticity. The micropolar or Cosserat model is used for many modern materials with microstructure, when an elementary particle of a continuous medium has six degrees of freedom. A method for solving the original boundary value problem, when it is divided into separate sequences of consistent scalar boundary value problems, including one for rotational component, is proposed. It was revealed that in a micropolar medium there are two «sorts» of natural oscillations of a rectangle, one of which is bounded from below, while in a classical medium there is only one «sort» of natural oscillations and there are no such restrictions. The proposed method can be developed for the case of other boundary conditions and for the three-dimensional case.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>модель Коссера</kwd><kwd>микрополярная теория упругости</kwd><kwd>собственные колебания</kwd><kwd>прямоугольник</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Cosserat model</kwd><kwd>micropolar theory of elasticity</kwd><kwd>natural oscillations</kwd><kwd>rectangle</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Cosserat E., Cosserat F. Theorie des corps deformables. Paris: Herman et Fils, 1909.</mixed-citation><mixed-citation xml:lang="en">Cosserat E. and Cosserat F., Theorie des Corps Deformables, Herman et Fils, Paris (1909).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Аэро Э. Л., Кувшинский Е. В. 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