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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">22573</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2019-15-6-470-476</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Dynamics of structures and buildings</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Динамика конструкций и сооружений</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">Free vibrations of anisotropic rectangular plate laying on a heterogeneous viscouselastic basis</article-title><trans-title-group xml:lang="ru"><trans-title>Свободные колебания анизотропной прямоугольной пластинки на неоднородно вязкоупругом основании</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Haciyev</surname><given-names>Vaqif C.</given-names></name><name xml:lang="ru"><surname>Гаджиев</surname><given-names>Вагиф Джамал Оглы</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Physical and Mathematical Sciences, Professor, Head of the Department of Theory of Elasticity and Plasticity, Institute of Mathematics and Mechanics</p></bio><bio xml:lang="ru"><p>доктор физико-математических наук, профессор, заведующий отделом теории упругости и пластичности Института математики и механики</p></bio><email>gulnar.mirzayeva@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mirzoeva</surname><given-names>Gulnar R.</given-names></name><name xml:lang="ru"><surname>Мирзоева</surname><given-names>Гюлнар Ровшан Кызы</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Philosophy in Mechanics, senior researcher of Department of Theory of Elasticity and Plasticity, Institute of Mathematics and Mechanics.</p></bio><bio xml:lang="ru"><p>доктор философии по механике, старший научный сотрудник отдела теории упругости и пластичности Института математики и механики</p></bio><email>gulnar.mirzayeva@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Agayarov</surname><given-names>Matlab G.</given-names></name><name xml:lang="ru"><surname>Агаяров</surname><given-names>Матлаб Гусейнгулу Оглы</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Philosophy in Mathematics and Mechanics Sciences, Associate Professor, Head of Additional Education Center</p></bio><bio xml:lang="ru"><p>доктор философии по математике и механике, доцент, директор Центра дополнительного образования</p></bio><email>gulnar.mirzayeva@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Academy of Sciences of Azerbaijan</institution></aff><aff><institution xml:lang="ru">Национальная академия наук Азербайджана</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Sumgait State University</institution></aff><aff><institution xml:lang="ru">Сумгаитский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2019</year></pub-date><volume>15</volume><issue>6</issue><issue-title xml:lang="en">VOL 15, NO6 (2019)</issue-title><issue-title xml:lang="ru">ТОМ 15, №6 (2019)</issue-title><fpage>470</fpage><lpage>476</lpage><history><date date-type="received" iso-8601-date="2019-12-29"><day>29</day><month>12</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Haciyev V.C., Mirzoeva G.R., Agayarov M.G.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Гаджиев В.Д., Мирзоева Г.Р., Агаяров М.Г.</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Haciyev V.C., Mirzoeva G.R., Agayarov M.G.</copyright-holder><copyright-holder xml:lang="ru">Гаджиев В.Д., Мирзоева Г.Р., Агаяров М.Г.</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/22573">https://journals.rudn.ru/structural-mechanics/article/view/22573</self-uri><abstract xml:lang="en"><p>The aim of the work. Free, transverse vibrations are considered heterogeneous along the three spatial coordinates of rectangular plates lying on an inhomogeneous viscoelastic base. It is assumed that the boundary conditions are homogeneous. A closed solution for the problem of free vibration of an inhomogeneous rectangular orthotropic plate based on an inhomogeneous viscoelastic foundation is developed in the article. Young's moduli and the density of the orthotropic plate continuously change with respect to three spatial coordinates, while the characteristics of a viscoelastic base change depending on the coordinates in the plane. Methods. The corresponding equation of motion is obtained using the classical theory of plates. The solution to the problem was constructed using the method of separation of variables and the Bubnov - Galerkin method. Results. Explicit formulas of the fundamental tone of the frequency of the transverse vibration of an anisotropic plate lying on an inhomogeneous viscoelastic base are determined. The influence of heterogeneity of orthotropic materials, viscosity inhomogeneities, inelastic and elastic substrates at dimensionless plate frequencies have been studied in detail.</p></abstract><trans-abstract xml:lang="ru"><p>В рамках поставленной цели рассмотрены свободные и поперечные колебания, неоднородные по трем пространственным координатам прямоугольных пластин, лежащих на неоднородно вязкоупругом основании. Предполагается, что краевые условия являются однородными. В исследовании разработано замкнутое решение для задачи о свободной вибрации неоднородной прямоугольной ортотропной пластины, опирающейся на неоднородный вязкоупругий фундамент. Модули Юнга и плотность ортотропной пластины непрерывно изменяются относительно трех пространственных координат, в то время как характеристики вязкоупругого основания изменяются в зависимости от координат в плоскости. Методы. Соответствующее уравнение движения получено с использованием классической теории пластин. В решении задачи применялись метод разделения переменных и метод Бубнова - Галеркина. Выводы. Определены явные формулы основного тона частоты поперечного колебания анизотропной пластинки, лежащей на неоднородно вязкоупругом основании. Детально изучено влияние неоднородности ортотропных материалов, неоднородности вязкости неупругих и упругих оснований на безразмерных частотах пластин.</p></trans-abstract><kwd-group xml:lang="en"><kwd>plate</kwd><kwd>continuity</kwd><kwd>anisotropy</kwd><kwd>density</kwd><kwd>bases</kwd><kwd>frequency</kwd><kwd>deflection</kwd><kwd>equations of motion</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>пластинка</kwd><kwd>непрерывность</kwd><kwd>неоднородность</kwd><kwd>анизотропность</kwd><kwd>плотность</kwd><kwd>основания</kwd><kwd>частота</kwd><kwd>прогиб</kwd><kwd>уравнения движения</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">Lomakin V.A. (1976). Teoriya uprugosti neodnorodnyh tel [The theory of elasticity of inhomogeneous walked]. Moscow, Publishing House of Moscow State University. (In Russ.)</mixed-citation><mixed-citation xml:lang="ru">Ломакин В.А. 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