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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">novtexmech</journal-id><journal-title-group><journal-title xml:lang="ru">Мехатроника, автоматизация, управление</journal-title><trans-title-group xml:lang="en"><trans-title>Mekhatronika, Avtomatizatsiya, Upravlenie</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1684-6427</issn><issn pub-type="epub">2619-1253</issn><publisher><publisher-name>Commercial Publisher «New Technologies»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17587/mau.20.398-404</article-id><article-id custom-type="elpub" pub-id-type="custom">novtexmech-662</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>СИСТЕМНЫЙ АНАЛИЗ, УПРАВЛЕНИЕ И ОБРАБОТКА ИНФОРМАЦИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SYSTEM ANALYSIS, CONTROL AND INFORMATION PROCESSING</subject></subj-group></article-categories><title-group><article-title>К задаче устойчивости по части переменных функционально-дифференциальных систем с последействием</article-title><trans-title-group xml:lang="en"><trans-title>On Problem of Partial Stability for Functional Differential Systems with Holdover</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>Воротников</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Vorotnikov</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Д-р физ.-мат. наук, проф.</p><p>г. Екатеринбург</p></bio><bio xml:lang="en"><p>D. Sc. (Phys. &amp; Math.), Professor</p><p>Ekaterinburg</p></bio><email xlink:type="simple">vorotnikov-vi@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Уральский федеральный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ural Federal University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>04</day><month>07</month><year>2019</year></pub-date><volume>20</volume><issue>7</issue><fpage>398</fpage><lpage>404</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Commercial Publisher «New Technologies», 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Commercial Publisher «New Technologies»</copyright-holder><copyright-holder xml:lang="en">Commercial Publisher «New Technologies»</copyright-holder><license xlink:href="https://mech.novtex.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://mech.novtex.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://mech.novtex.ru/jour/article/view/662">https://mech.novtex.ru/jour/article/view/662</self-uri><abstract><p>Развитие теории и качественных методов исследования нелинейных систем функционально-дифференциальных уравнений с последействием (запаздыванием) представляет значительный интерес для современной нелинейной теории управления и многочисленных приложений. Важной в теоретическом и прикладном плане является задача исследования устойчивости процессов, описываемых системами уравнений данного класса. </p><p>В данной статье для нелинейной нестационарной системы функционально-дифференциальных уравнений с последействием общего вида рассматривается задача устойчивости нулевого положения равновесия по отношению не ко всем переменным, определяющим состояние указанной системы, а только по отношению к их некоторой части. Формально-математическая трактовка такой устойчивости восходит к работам А. М. Ляпунова и В. В. Румянцева с соответствующим уточнением применительно к рассматриваемому классу систем. Данная постановка задачи естественным образом возникает в приложениях как исходя из требований нормального функционирования, так и при оценке возможностей проектируемой системы, и позволяет лучше понять процессы, протекающие в сложных управляемых системах. Находятся условия на структурную форму рассматриваемой системы, при которых устойчивость по заданной части переменных нулевого положения равновесия означает его устойчивость по отношению к другой — бóльшей части переменных, включающих некоторую дополнительную группу переменных. Указанные условия включают в себя условие равномерной асимптотической устойчивости нулевого положения равновесия подсистемы, "приведенной" по дополнительной группе переменных, а также ограничение на связь "приведенной" подсистемы с другими частями изучаемой системы. Дается приложение к задаче стабилизации по отношению к части переменных управляемых систем. </p></abstract><trans-abstract xml:lang="en"><p>The theory of systems of functional differential equations is a significant and rapidly developing sphere of modern mathematics which finds extensive application in complex systems of automatic control and also in economic, modern technical, ecological, and biological models. Naturally, the problems arises of stability and partial stability of the processes described by the class of the equation. The article studies the problem of partial stability which arise in applications either from the requirement of proper performance of a system or in assessing system capability. Also very effective is the approach to the problem of stability with respect to all variables based on preliminary analysis of partial stability. We suppose that the system have the zero equilibrium position. A conditions are obtained under which the uniform stability (uniform asymptotic stability) of the zero equilibrium position with respect to the part of the variables implies the uniform stability (uniform asymptotic stability) of this equilibrium position with respect to the other, larger part of the variables, which include an additional group of coordinates of the phase vector. These conditions include: 1) the condition for uniform asymptotic stability of the zero equilibrium position of the "reduced" subsystem of the original system with respect to the additional group of variables; 2) the restriction on the coupling between the "reduced" subsystem and the rest parts of the system. Application of the obtained results to a problem of stabilization with respect to a part of the variables for nonlinear controlled systems is discussed. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>нелинейная система функционально-дифференциальных уравнений с последействием</kwd><kwd>устойчивость по части переменных</kwd></kwd-group><kwd-group xml:lang="en"><kwd>nonlinear functional-differential system with holdover</kwd><kwd>partial stability</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">Красовский Н. Н. Некоторые задачи теории устойчивости движения. 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