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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">41996</article-id><article-id pub-id-type="doi">10.14498/vsgtu1763</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">An undamped oscillation model with twodifferent contact angles for a spherical dropletimpacting on solid surface</article-title><trans-title-group xml:lang="ru"><trans-title>Модель незатухающего колебания для сферической капли на твердой поверхности с двумя различными углами контакта</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name><surname>Chen</surname><given-names>Shi</given-names></name><bio xml:lang="en"><p>PhD, Associate professor</p></bio><bio xml:lang="ru"><p>PhD, доцент</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name><surname>Cong</surname><given-names>Bozhong</given-names></name><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name><surname>Zhang</surname><given-names>Dongqi</given-names></name><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name><surname>Liu</surname><given-names>Xiaohua</given-names></name><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name><surname>Shen</surname><given-names>Shengqiang</given-names></name><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Dalian University of Technology</institution></aff><aff><institution xml:lang="ru"></institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2020-07-31" publication-format="electronic"><day>31</day><month>07</month><year>2020</year></pub-date><volume>24</volume><issue>2</issue><issue-title xml:lang="en">VOL 24, NO2 (2020)</issue-title><issue-title xml:lang="ru">ТОМ 24, №2 (2020)</issue-title><fpage>390</fpage><lpage>400</lpage><history><date date-type="received" iso-8601-date="2020-08-04"><day>04</day><month>08</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2020, Samara State Technical University</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2020, Самарский государственный технический университет</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="en">Samara State Technical University</copyright-holder><copyright-holder xml:lang="ru">Самарский государственный технический университет</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/41996">https://journals.eco-vector.com/1991-8615/article/view/41996</self-uri><abstract xml:lang="en"><p>In order to further elucidate the dynamic theory of droplet oscillating on solid surface, a new handling method of contact angle of the droplet during the process of the oscillation was founded, which is based on the spherical model. The influence of gravity on the contact angle andspreading radius was discussed. Thus, an equation between the spreading radius of the dropletand time flow was founded. The results of theoretical calculation were compared with smoothednumerical results.</p></abstract><trans-abstract xml:lang="ru"><p>Предложен нелинейный подход описания колебания сферической капли на твердой поверхности. Интегрирование уравнений движений осуществляется без использования линеаризации тригонометрических функций, зависящих от угла контакта. Иными словами, угол контакта является произвольной конечной величиной. Проведено исследование влияние силы тяжести на угол контакта и радиус распространения капли по твердой поверхности. Таким образом, было найдено нелинейное уравнение, описывающее изменение радиуса распространения капли в зависимости от времени. Данное уравнение было численно проинтегрировано. Исследование численной сходимости осуществлялось посредством сравнения с известными модельными точными решениями и известными экспериментальными данными. На основании исследования методами численного интегрирования полученного в статье уравнения можно сделать вывод о целесообразности использования математической модели для описания и исследования новых физических эффектов при колебании капель.</p></trans-abstract><kwd-group xml:lang="en"><kwd>droplet oscillation</kwd><kwd>contact angle</kwd><kwd>theoretical analysis</kwd><kwd>spectrum analysis</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>колебание капли</kwd><kwd>угол контакта</kwd><kwd>теоретический анализ</kwd><kwd>спектральный анализ</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Nakayama Y., Kidokoro T., Sakurai K., Fuel injection control system of an internal combustion engine, US Patent no. 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