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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">Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Самарского государственного технического университета. Серия «Физико-математические науки»</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1991-8615</issn><issn publication-format="electronic">2310-7081</issn><publisher><publisher-name xml:lang="en">Samara State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">562936</article-id><article-id pub-id-type="doi">10.14498/vsgtu2046</article-id><article-id pub-id-type="edn">UHLXVK</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Mechanics of Solids</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Механика деформируемого твердого тела</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">Mathematical models of nonlinear dynamics of functionally graded nano/micro/macroscale porous closed cylindrical Kirchhoff-Love shells</article-title><trans-title-group xml:lang="ru"><trans-title>Математические модели нелинейной динамики функционально-градиентных нано/микро макромасштабных пористых замкнутых цилиндрических оболочек Кирхгофа-Лява</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3238-2317</contrib-id><contrib-id contrib-id-type="scopus">56435768900</contrib-id><contrib-id contrib-id-type="researcherid">T-9860-2017</contrib-id><contrib-id contrib-id-type="spin">9900-0883</contrib-id><name-alternatives><name xml:lang="en"><surname>Yakovleva</surname><given-names>Tatiana V.</given-names></name><name xml:lang="ru"><surname>Яковлева</surname><given-names>Татьяна Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Phys. &amp; Math. Sci.; Associate Professor; Dept. of Mathematics and Modeling</p></bio><bio xml:lang="ru"><p>кандидат физико-математических наук, доцент; доцент; каф. математики и моделирования</p></bio><email>yan-tan1987@mail.ru</email><uri>https://www.mathnet.ru/person53186</uri><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4914-764X</contrib-id><name-alternatives><name xml:lang="en"><surname>Krysko</surname><given-names>Vadim A.</given-names></name><name xml:lang="ru"><surname>Крысько</surname><given-names>Вадим Анатольевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Tech. Sci., Professor; Head of Department; Dept. of Mathematics and Modeling</p></bio><bio xml:lang="ru"><p>доктор технических наук, профессор; заведующий кафедрой; каф. математики и моделирования</p></bio><email>tak@san.ru</email><uri>https://www.mathnet.ru/person33628</uri><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Yuri Gagarin State Technical University of Saratov</institution></aff><aff><institution xml:lang="ru">Саратовский государственный технический университет имени Гагарина Ю.А.</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-09-02" publication-format="electronic"><day>02</day><month>09</month><year>2024</year></pub-date><volume>28</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>96</fpage><lpage>116</lpage><history><date date-type="received" iso-8601-date="2023-07-26"><day>26</day><month>07</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2024-04-24"><day>24</day><month>04</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Authors; Samara State Technical University (Compilation, Design, and Layout)</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Авторский коллектив; Самарский государственный технический университет (составление, дизайн, макет)</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Authors; Samara State Technical University (Compilation, Design, and Layout)</copyright-holder><copyright-holder xml:lang="ru">Авторский коллектив; Самарский государственный технический университет (составление, дизайн, макет)</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/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/1991-8615/article/view/562936">https://journals.eco-vector.com/1991-8615/article/view/562936</self-uri><abstract xml:lang="en"><p>The article presents new mathematical models for the dynamics of nonlinear nano/micro/macro-scale functionally graded porous closed cylindrical shells. The Kirchhoff–Love hypothesis is chosen as the kinematic model for the shells. Geometric nonlinearity is considered according to the von Karman model. Nanoeffects are accounted for using by a modified moment theory of elasticity. Variational and differential equations, as well as boundary and initial conditions, are derived from Hamilton’s principle. A proof of the existence of a solution is conducted based on the theory of generalized solutions to differential equations (using methods of Hilbert spaces and variational methods).As examples, nano/micro/macro-scale closed cylindrical shells are considered as systems with "almost" an infinite number of degrees of freedom subjected to banded transverse alternating loading. The Bubnov–Galerkin method in higher approximations is adopted as the method for reducing partial differential equations to the Cauchy problem. Its convergence is investigated.The Cauchy problem is solved using Runge–Kutta methods of fourth to eighth order accuracy and the Newmark method. The application of several numerical methods at each stage of modeling is necessary to ensure the reliability of the obtained results. The study of complex oscillation characteristics of the closed cylindrical nano/micro/macro-scale shell is conducted using nonlinear dynamics methods, which involve constructing signals, phase portraits, applying Fourier analysis, and various wavelet transformations,among which the Morlet wavelet proved to be the most informative.An analysis of the type of chaotic oscillations is carried out based on the spectrum of Lyapunov exponents using the Sano–Sawada method and the dominant exponent through several methods: Kanca, Rosenstein, and Wolf. It is shown that the size-dependent parameter and the consideration of porosity have a significant impact on the nature of the oscillations of cylindrical shells. The phenomenon of hyper-chaos has been discovered.</p></abstract><trans-abstract xml:lang="ru"><p>Построены новые математические модели динамики нелинейных нано/микро/макромасштабных функционально-градиентных пористых замкнутых цилиндрических оболочек. В качестве кинематической модели для оболочек выбрана гипотеза Кирхгофа–Лява. Геометрическая нелинейность учитывается по модели фон Кармана. Наноэффекты учитываются согласно модифицированной моментной теории упругости. Вариационные и дифференциальные уравнения, граничные и начальные условия получены из принципа Гамильтона. Проводится доказательство теоремы существования решения на основе теории обобщенных решений дифференциальных уравнений (методы гильбертовых пространств, ва-риационные методы).В качестве примеров рассмотрены нано/микро/макромасштабные замкнутые цилиндрические оболочки как системы с «почти» бесконечным числом степеней свободы под действием полосовой поперечной знакопеременной нагрузки. В качестве метода сведения уравнений в частных производных к задаче Коши принят метод Бубнова–Галеркина в высших приближениях. Исследована его сходимость.Задача Коши решена методами Рунге–Кутты от четвертого до восьмого порядков точности и методом Ньюмарка. Применение нескольких численных методов на каждом этапе моделирования необходимо для достоверности получаемых результатов. Исследование характера сложных колебаний замкнутой цилиндрической нано/микро/макромасштабной оболочки проведено методами нелинейной динамики, для этого построены сигналы, фазовые портреты, применены Фурье-анализ и различные вейвлет-преобразования, среди которых вейвлет Морле оказался наиболее информативным.Анализ типа хаотических колебаний проводится на основе спектра показателей Ляпунова методом Сано–Савада и старшего показателя несколькими методами: Канца, Розенштейна, Вольфа. Показано, что величина размерно-зависимого параметра и учет пористости оказывают существенное влияние на характер колебаний цилиндрических оболочек. Обнаружено явление гиперхаоса.</p></trans-abstract><kwd-group xml:lang="en"><kwd>dynamics</kwd><kwd>porosity</kwd><kwd>modified couple stress theory</kwd><kwd>solution existence theorems</kwd><kwd>hyper chaos</kwd><kwd>Kirchhoff-Love model</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>динамика</kwd><kwd>пористость</kwd><kwd>модифицированная моментная теория упругости</kwd><kwd>теоремы существования решения</kwd><kwd>гипер-хаос</kwd><kwd>модель Кирхгофа-Лява</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This study was supported by the Russian Science Foundation, project no. 22–71–10083, https://rscf.ru/en/project/22-71-10083/</funding-statement><funding-statement xml:lang="ru">Исследования проведены при финансовой поддержке гранта Российского научного фонда (проект № 22–71–10083, https://rscf.ru/project/22-71-10083/)</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Krysko V. 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