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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">mais</journal-id><journal-title-group><journal-title xml:lang="ru">Моделирование и анализ информационных систем</journal-title><trans-title-group xml:lang="en"><trans-title>Modeling and Analysis of Information Systems</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1818-1015</issn><issn pub-type="epub">2313-5417</issn><publisher><publisher-name>Yaroslavl State University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18255/1818-1015-2016-5-548-558</article-id><article-id custom-type="elpub" pub-id-type="custom">mais-388</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>Оригинальные статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Взаимодействие двух волн в модели Ферми – Паста – Улама</article-title><trans-title-group xml:lang="en"><trans-title>Two Wave Interactions in a Fermi– Pasta–Ulam Model</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>Глызин</surname><given-names>С. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Glyzin</surname><given-names>S. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д-р физ.-мат. наук, зав. кафедрой компьютерных сетей;ведущий научный сотрудник</p></bio><bio xml:lang="en"><p>Doctor, Professor</p></bio><email xlink:type="simple">glyzin@uniyar.ac.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>Кащенко</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kashchenko</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д-р физ.-мат. наук, зав. кафедрой математического моделирования</p></bio><bio xml:lang="en"><p>Doctor, Professor</p></bio><email xlink:type="simple">kasch@uniyar.ac.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Толбей</surname><given-names>А. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Tolbey</surname><given-names>A. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. физ.-мат. наук, доцент кафедры компьютерных сетей</p></bio><bio xml:lang="en"><p>PhD, Associate Professor</p></bio><email xlink:type="simple">bekva@yandex.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Ярославский государственный университет им. П.Г. Демидова, ул. Советская, 14, г. Ярославль, 150003 Россия;&#13;
НЦЧ РАН, ул. Лесная, д. 9, г. Черноголовка, Московская область, 142432 Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>P.G. Demidov Yaroslavl State University, 14 Sovetskaya str., Yaroslavl 150003, Russia,&#13;
Scientific Center in Chernogolovka RAS, 9 Lesnaya str., Chernogolovka, Moscow region, 142432, Russia</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Ярославский государственный университет им. П.Г. Демидова, ул. Советская, 14, г. Ярославль, 150003 Россия;&#13;
Национальный исследовательский ядерный университет «МИФИ», Каширское шоссе, 31, г. Москва, 115409 Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>P.G. Demidov Yaroslavl State University, 14 Sovetskaya str., Yaroslavl 150003, Russia, National Research Nuclear University MEPhI, 31 Kashirskoye shosse, Moscow 115409, Russia</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Ярославский государственный университет им. П.Г. Демидова, ул. Советская, 14, г. Ярославль, 150003 Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>P.G. Demidov Yaroslavl State University, 14 Sovetskaya str., Yaroslavl 150003, Russia</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2016</year></pub-date><pub-date pub-type="epub"><day>20</day><month>10</month><year>2016</year></pub-date><volume>23</volume><issue>5</issue><fpage>548</fpage><lpage>558</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Глызин С.Д., Кащенко С.А., Толбей А.О., 2016</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="ru">Глызин С.Д., Кащенко С.А., Толбей А.О.</copyright-holder><copyright-holder xml:lang="en">Glyzin S.D., Kashchenko S.A., Tolbey A.O.</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.mais-journal.ru/jour/article/view/388">https://www.mais-journal.ru/jour/article/view/388</self-uri><abstract><p>Работа посвящена исследованию динамических свойств решений краевых задач, связанных с классической системой Ферми – Паста – Улама (ФПУ). При исследовании локальной динамики этих задач может реализовываться критический случай бесконечной размерности. В этих условиях построено специальное нелинейное уравнение с частными производными, которое играет роль квазинормальной формы, т.е. определяет в главном поведение всех решений исходной краевой задачи с начальными условиями из достаточно малой окрестности состояния равновесия. В зависимости от значений параметров в качестве квазинормальных форм выступают модифицированное уравнение Кортевега – де Вриза (КДВ) и уравнение Кортевега – де Вриза – Бюргерса (КДВБ). При некоторых дополнительных предположениях к полученным краевым задачам применена процедура повторной нормализации, приводящая к бесконечномерной системе обыкновенных дифференциальных уравнений, описан способ сворачивания этой системы в краевую задачу – аналог нормальной формы. Построенные квазинормальные формы позволяют судить о динамике задачи ФПУ. Основной результат работы состоит в том, что аналитическими методами нелинейной динамики изучен вопрос о взаимодействии волн, движущихся в разных направлениях, в задаче ФПУ. При рассмотрении так называемых регулярных решений описано влияние волн друг на друга, которое задается специальным интегральным соотношением. Показано, что это влияние является асимптотически малым и не меняет форму волн, внося вклад только в их скоростной сдвиг, который не меняется по времени.</p></abstract><trans-abstract xml:lang="en"><p>The work is devoted to the dynamic properties of the solutions of boundary value problems associated with the classical system of Fermi – Pasta – Ulam (FPU). We study this problem in infinite-dimensional case, when a countable number of roots of characteristic equations tend to an imaginary axis. Under these conditions, we built a special non-linear partial differential equation, which plays the role of a quasinormal form, i.e, it defines the dynamics of the original boundary value problem with the initial conditions in a sufficiently small neighborhood of the equilibrium state. The modified Korteweg de Vries (KdV) equation and the Korteweg de Vries Burgers (KdVB) one are quasinormal forms depending on the parameter values. Under some additional assumptions, we apply the procedure of renormalization to the obtained boundary value problems. This procedure leads to an infinite-dimensional system of ordinary differential equations. We describe a method of folding this system in the special boundary value problem, which is an analogue of the normal form. The main result is that the analytical methods of nonlinear dynamics explored the interaction of waves moving in different directions, in the problem of the FPU. It was shown that waves influence on each other is asymptotically small and does not change the shape of waves, contributing only a shift in their speed, which does not change over time.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>модель Ферми – Паста – Улама</kwd><kwd>обобщенное уравнение Кортевега–де Вриза</kwd><kwd>квазинормальная форма</kwd><kwd>краевая задача</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Fermi–Pasta–Ulam model</kwd><kwd>generalized KdV equation</kwd><kwd>quasinormal form</kwd><kwd>boundary value problem</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">Russel Scott J., “Report of waves”, Report of the 14-th. Meeting of the British Association for the Advancement of Science, London, 1844, 311–390.</mixed-citation><mixed-citation xml:lang="en">Russel Scott J., “Report of waves”, Report of the 14-th. 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