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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">Contemporary Mathematics. Fundamental Directions</journal-id><journal-title-group><journal-title xml:lang="en">Contemporary Mathematics. Fundamental Directions</journal-title><trans-title-group xml:lang="ru"><trans-title>Современная математика. Фундаментальные направления</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2413-3639</issn><issn publication-format="electronic">2949-0618</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">31864</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2022-68-3-451-466</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</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">Asymptotic Behavior of Solutions of a Complete Second-Order Integro-Differential Equation</article-title><trans-title-group xml:lang="ru"><trans-title>Асимптотическое поведение решений полного интегро-дифференциального уравнения второго порядка</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zakora</surname><given-names>D. A.</given-names></name><name xml:lang="ru"><surname>Закора</surname><given-names>Д. А.</given-names></name></name-alternatives><email>dmitry.zkr@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Vernadsky Crimean Federal University</institution></aff><aff><institution xml:lang="ru">Крымский федеральный университет им. В.И. Вернадского</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2022-09-08" publication-format="electronic"><day>08</day><month>09</month><year>2022</year></pub-date><volume>68</volume><issue>3</issue><issue-title xml:lang="en">Proceedings of the Crimean Autumn Mathematical School-Symposium</issue-title><issue-title xml:lang="ru">Труды Крымской осенней математической школы-симпозиума</issue-title><fpage>451</fpage><lpage>466</lpage><history><date date-type="received" iso-8601-date="2022-09-08"><day>08</day><month>09</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2022, Contemporary Mathematics. Fundamental Directions</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2022, Современная математика. Фундаментальные направления</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="en">Contemporary Mathematics. Fundamental Directions</copyright-holder><copyright-holder xml:lang="ru">Современная математика. Фундаментальные направления</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-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/31864">https://journals.rudn.ru/CMFD/article/view/31864</self-uri><abstract xml:lang="en"><p style="text-align: justify;">In this paper, we study a complete second-order integro-differential operator equation in a Hilbert space. The difference-type kernel of an integral perturbation is a holomorphic semigroup bordered by unbounded operators. The asymptotic behavior of solutions of this equation is studied. Asymptotic formulas for solutions are proved in the case when the right-hand side is close to an almost periodic function. The obtained formulas are applied to the study of the problem of forced longitudinal vibrations of a viscoelastic rod with Kelvin-Voigt friction.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">В работе изучается полное интегро-дифференциальное операторное уравнение второго порядка в гильбертовом пространстве. Ядро разностного типа интегрального возмущения представляет собой голоморфную полугруппу, окаймленную неограниченными операторами. Исследуется асимптотическое поведение решений этого уравнения. Доказаны асимптотические формулы для решений в случае, когда правая часть близка к почти периодической функции. Полученные формулы применены к исследованию задачи о вынужденных продольных колебаниях вязкоупругого стержня с трением Кельвина-Фойгта.</p></trans-abstract><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Власов В.В., Раутиан Н.А. 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