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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">mgssuvest</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник МГСУ</journal-title><trans-title-group xml:lang="en"><trans-title>Vestnik MGSU</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1997-0935</issn><issn pub-type="epub">2304-6600</issn><publisher><publisher-name>Moscow State University of Civil Engineering (National Research University) (MGSU)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22227/1997-0935.2026.6.898-905</article-id><article-id custom-type="elpub" pub-id-type="custom">mgssuvest-1061</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>Проектирование и конструирование строительных систем. Строительная механика. Основания и фундаменты, подземные сооружения</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Construction system design and layout planning. Construction mechanics. Bases and foundations, underground structures</subject></subj-group></article-categories><title-group><article-title>Гармонический осциллятор Дуффинга. Эволюция аттрактора</article-title><trans-title-group xml:lang="en"><trans-title>Duffing harmonic oscillator. Evolution of the attractor</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>Азарова</surname><given-names>Ю. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Azarova</surname><given-names>Yu. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юлия Владимировна Азарова — аспирант</p><p>129337, г. Москва, Ярославское шоссе, д. 26</p></bio><bio xml:lang="en"><p>Yulia V. Azarova — postgraduate student</p><p>26 Yaroslavskoe shosse, Moscow, 129337</p></bio><email xlink:type="simple">azarovauv@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>Казаков</surname><given-names>Д. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Kazakov</surname><given-names>D. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Даниил Николаевич Казаков — аспирант</p><p>129337, г. Москва, Ярославское шоссе, д. 26</p></bio><bio xml:lang="en"><p>Daniil N. Kazakov — postgraduate student</p><p>26 Yaroslavskoe shosse, Moscow, 129337</p></bio><email xlink:type="simple">denialkazakov9@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0271-8193</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бунин</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Bunin</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Владимир Андреевич Бунин — аспирант</p><p>129337, г. Москва, Ярославское шоссе, д. 26</p></bio><bio xml:lang="en"><p>Vladimir A. Bunin — postgraduate student</p><p>26 Yaroslavskoe shosse, Moscow, 129337</p></bio><email xlink:type="simple">buninw2001@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9426-0791</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кузнецов</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuznetsov</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сергей Владимирович Кузнецов — доктор физико-математических наук, профессор, заведующий кафедрой</p><p>129337, г. Москва, Ярославское шоссе, д. 26</p><p>Scopus: 7202573564, ResearcherID: H-9448-2013</p></bio><bio xml:lang="en"><p>Sergey V. Kuznetsov — Doctor of Physical and Mathematical Sciences, Professor, Head of Department</p><p>26 Yaroslavskoe shosse, Moscow, 129337</p><p>Scopus: 7202573564, ResearcherID: H-9448-2013</p></bio><email xlink:type="simple">KuznetsovSV@mgsu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский Московский государственный строительный университет (НИУ МГСУ)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Moscow State University of Civil Engineering (National Research University) (MGSU)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>30</day><month>06</month><year>2026</year></pub-date><volume>21</volume><issue>6</issue><fpage>898</fpage><lpage>905</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Азарова Ю.В., Казаков Д.Н., Бунин В.А., Кузнецов С.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Азарова Ю.В., Казаков Д.Н., Бунин В.А., Кузнецов С.В.</copyright-holder><copyright-holder xml:lang="en">Azarova Y.V., Kazakov D.N., Bunin V.A., Kuznetsov S.V.</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://www.vestnikmgsu.ru/jour/article/view/1061">https://www.vestnikmgsu.ru/jour/article/view/1061</self-uri><abstract><sec><title>Введение</title><p>Введение. Рассмотрена задача анализа нелинейных колебаний гармонического осциллятора Дуффинга, актуальная для оценки устойчивости механических и строительных систем с упругими и демпфирующими элементами. Актуальность исследования обусловлена необходимостью описания переходов от регулярных колебаний к хаосу в элементах сейсмоизоляции и виброзащиты зданий. Новизна работы заключается в применении метода Розенштейна для количественной оценки экспонентоподобной величины e1 вместо традиционного визуального анализа, использованного в классических исследованиях Ю. Уэды (1979).</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Математическая модель осциллятора описывается уравнением ẍ + kẋ + x3 = Bcos(ωt). Численное решение получено в среде MATLAB с применением пакета «+ueda». Для анализа динамики построены сечения Пуанкаре и рассчитаны экспонентоподобные величины e1 методом Розенштейна, основанном на отслеживании расхождения траекторий в реконструированном фазовом пространстве.</p></sec><sec><title>Результаты</title><p>Результаты. Показано, что при увеличении амплитуды возбуждения B (при k = 0,10) система переходит от периодических режимов к хаотическим через квазипериодичность. При увеличении демпфирования k (при B = 12,0) наблюдается обратный процесс — постепенное подавление хаоса и возвращение к регулярным колебаниям. Построены зависимости e1(B) и e1(k), уточняющие границы переходов к хаосу по сравнению с данными Ю. Уэды. Метод Розенштейна позволил количественно подтвердить наличие критических интервалов Bc = 11,9–12,2 и kc = 0,26–0,30.</p></sec><sec><title>Выводы</title><p>Выводы. Результаты исследования подтвердили применимость метода Розенштейна для количественной идентификации хаотических режимов в системах Дуффинга. Полученные данные уточняют границы переходов, согласуясь с классическими работами, и могут быть использованы при проектировании сейсмоизоляторов и вибродемпфирующих устройств, где необходимо избегать хаотических колебаний.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. The paper investigates nonlinear oscillations of the Duffing harmonic oscillator, which are relevant for assessing the stability of mechanical and structural systems with elastic and damping components. The study’s relevance is linked to understanding the transition from regular to chaotic oscillations in seismic isolation and vibration control elements. The novelty lies in applying the Rosenstein method to quantitatively estimate the exponent-like quantity e1, replacing the qualitative approach used in Ueda’s classical studies (1979).</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The oscillator is described by the equation ẍ + kẋ + x3 = Bcos(ωt). Numerical integration was performed in MATLAB using the custom “+ueda” package. The dynamics were analyzed through Poincaré sections and by calculating the exponent-like value e1 using the Rosenstein algorithm, which tracks divergence of nearby trajectories in the reconstructed phase space.</p></sec><sec><title>Results</title><p>Results. It is shown that increasing the excitation amplitude B (at k = 0.10) drives the system from periodic to chaotic motion via quasi-periodic states. Increasing the damping k (at B = 12.0) suppresses chaotic oscillations, restoring regular behaviour. The dependencies e1(B) and e1(k), refine the boundaries of chaos onset compared to Ueda’s results, identifying critical intervals Bc = 11.9–12.2 and kc = 0.26–0.30.</p></sec><sec><title>Conclusions</title><p>Conclusions. The results of the study confirmed the applicability of the Rosenstein method for the quantitative identification of chaotic modes in Duffing systems. The data obtained refine the boundaries of the transitions, in line with classical studies, and can be used in the design of seismic isolators and vibration-damping devices where it is necessary to avoid chaotic oscillations.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>осциллятор Дуффинга</kwd><kwd>метод Розенштейна</kwd><kwd>аттрактор</kwd><kwd>хаос</kwd><kwd>сечение Пуанкаре</kwd><kwd>сейсмоизоляция</kwd><kwd>демпфирование</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Duffing oscillator</kwd><kwd>Rosenstein method</kwd><kwd>attractor</kwd><kwd>chaos</kwd><kwd>Poincaré section</kwd><kwd>seismic isolation</kwd><kwd>damping</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">Nayfeh A.H., Mook D.T. 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