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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Structural Mechanics of Engineering Constructions and Buildings</journal-id><journal-title-group><journal-title xml:lang="en">Structural Mechanics of Engineering Constructions and Buildings</journal-title><trans-title-group xml:lang="ru"><trans-title>Строительная механика инженерных конструкций и сооружений</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1815-5235</issn><issn publication-format="electronic">2587-8700</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">30918</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2021-17-6-628-638</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Shell dynamics</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Динамика оболочек</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Determination of natural vibration frequencies of reinforced cylindrical shell</article-title><trans-title-group xml:lang="ru"><trans-title>Определение собственных частот колебаний армированной цилиндрической оболочки</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5192-1166</contrib-id><name-alternatives><name xml:lang="en"><surname>Rustamova</surname><given-names>Mexseti Akif</given-names></name><name xml:lang="ru"><surname>Рустамова</surname><given-names>Мехсети Акиф кызы</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Physical and Mathematical Sciences, leading researcher, Associate Professor, Department of Wave Dynamics, Institute of Mathematics and Mechanics</p></bio><bio xml:lang="ru"><p>кандидат физико-математических наук, ведущий научный сотрудник, доцент отдела волновой динамики, Институт математики и механики</p></bio><email>mehsetir@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Mathematics and Mechanics, National Academy of Sciences of Azerbaijan</institution></aff><aff><institution xml:lang="ru">Институт математики и механики Национальной академии наук Азербайджана</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-12-30" publication-format="electronic"><day>30</day><month>12</month><year>2021</year></pub-date><volume>17</volume><issue>6</issue><issue-title xml:lang="en">Prospects for the application of shell structures and thin shells in the first half of the 21st century</issue-title><issue-title xml:lang="ru">Перспективы применения оболочечных структур и тонких оболочек в первой половине XXI в.</issue-title><fpage>628</fpage><lpage>638</lpage><history><date date-type="received" iso-8601-date="2022-04-28"><day>28</day><month>04</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Rustamova M.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Рустамова М.А.</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Rustamova M.A.</copyright-holder><copyright-holder xml:lang="ru">Рустамова М.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/structural-mechanics/article/view/30918">https://journals.rudn.ru/structural-mechanics/article/view/30918</self-uri><abstract xml:lang="en"><p style="text-align: justify;">Free vibrations of a reinforced cylindrical shell filled with liquid are investigated. The case of an orthotropic shell is considered when the cord filament is placed symmetrically with respect to the meridian of the shell. The motion of a fluid is potential and is described by a wave equation. The fluid moves without separation from the walls of the cylinders. The fluid pressure is taken into account in the equations of motion of the shells, and the velocities of the fluid and the shell are equalized at the boundaries. Representing a solution in a harmonic form reduces to a system of transcendental equations. Comparison of the solutions of the problems without a liquid and with a liquid shows the dependence of the frequency of the system without a liquid at the frequency of the system with the liquid. An inverse method is proposed for solving the equation. The inverse method for solving the problem has made it possible to construct a more accurate frequency spectrum of free oscillations of the system. For some values of the system parameters, the natural frequencies of the cylinder are determined.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Исследуются свободные колебания армированной цилиндрической оболочки, заполненной жидкостью. Рассматривается случай ортотропной оболочки, когда нити корда укладываются симметрично относительно меридиана оболочки. Движение жидкости потенциально, описывается волновым уравнением. Жидкость движется без отрыва от стенок цилиндров. Давление жидкости учитывается в уравнениях движения оболочек, а скорости жидкости и оболочки приравниваются на границах. Представление решения в гармоническом виде сводится к системе трансцендентных уравнений. При сравнении решений задач без жидкости и с жидкостью находится зависимость частоты системы без жидкости с частотой системы с жидкостью. Для решения уравнения предложен обратный метод, который позволил построить более точный частотный спектр свободных колебаний системы. При некоторых значениях параметров системы определены собственные частоты колебаний цилиндра.</p></trans-abstract><kwd-group xml:lang="en"><kwd>cylinder</kwd><kwd>density of cord filaments</kwd><kwd>horizontal movement</kwd><kwd>fluid density</kwd><kwd>volume fraction of cord</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>цилиндр</kwd><kwd>плотность нитей корда</kwd><kwd>горизонтальное перемещение</kwd><kwd>плотность жидкости</kwd><kwd>объемная доля корда</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Filippov S.B. Using the Fourier series for analysis of free vibrations of a cylindrical shell rotating on rollers. Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy. 2018;5(2):321–333. (In Russ.) https://doi.org/10.21638/11701/spbu01.2018.212</mixed-citation><mixed-citation xml:lang="ru">Филиппов С.Б. 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