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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.27.439-448</article-id><article-id custom-type="elpub" pub-id-type="custom">novtexmech-2073</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>РОБОТЫ, МЕХАТРОНИКА И РОБОТОТЕХНИЧЕСКИЕ СИСТЕМЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ROBOT, MECHATRONICS AND ROBOTIC SYSTEMS</subject></subj-group></article-categories><title-group><article-title>Снижение кинематических сингулярностей в последовательных манипуляторах с помощью вспомогательной виртуальной оси</article-title><trans-title-group xml:lang="en"><trans-title>Kinematic Singularity Mitigation in Serial Manipulators Using Auxiliary Virtual Axis Insertion</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>Абделлатиф</surname><given-names>Э. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Abdellatif</surname><given-names>E. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>магистрант </p><p>г. Ижевск </p></bio><bio xml:lang="en"><p>Master’s Student </p><p>Izhevsk, 426069 </p></bio><email xlink:type="simple">ezz2169@vivaldi.net</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>Хамуда</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Hamouda</surname><given-names>A. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>магистран</p><p>г. Ижевск</p></bio><bio xml:lang="en"><p>Master’s Student </p><p>Izhevsk, 426069 </p></bio><email xlink:type="simple">abdullahhamuoda@gmail.com</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>Аль Аккад</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Al Akkad</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. техн. наук, доц. </p><p>г. Ижевск</p></bio><bio xml:lang="en"><p>Ph.D., Associate Professor </p><p>Izhevsk, 426069 </p></bio><email xlink:type="simple">aimanakkad@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ИЖГТУ им. М. Т. Калашникова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kalashnikov Izhevsk State Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>19</day><month>08</month><year>2026</year></pub-date><volume>27</volume><issue>8</issue><fpage>439</fpage><lpage>447</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Commercial Publisher «New Technologies», 2026</copyright-statement><copyright-year>2026</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/2073">https://mech.novtex.ru/jour/article/view/2073</self-uri><abstract><p>Конвенция Денавита—Хартенберга (DH), хотя и является основополагающей в кинематике роботов, содержит критический недостаток в представлении определенного класса антропоморфных манипуляторов. В данной статье выявляется и формализуется "проблема исчезающей длины" — сингулярность, возникающая в кинематических цепях, содержащих три последовательных шарнира, где оси z (рыскание), x (крен) и y (тангаж) образуют взаимно ортогональную триаду. Эта конфигурация, характерная для последовательностей типа "крен—рыскание—тангаж" или "тангаж—рыскание—крен", приводит к тому, что начало координат среднего (рыскающего) шарнира совпадает с началом координат последующего шарнира. Следовательно, две физические длины звеньев, предшествующие и следующие за рыскающим шарниром, сливаются в одну суммарную длину в кинематической модели, тем самым теряя критическую степень свободы в представлении. Мы вводим вспомогательный виртуальный шарнир (AVJ) — пассивный шарнир с фиксированным ограничением — для устранения этой свернутой цепи. AVJ восстанавливает отсутствующую точку отсчета, возвращая две различные длины звеньев и обеспечивая кинематическую целостность. Мы предлагаем полную кинематическую и динамическую формулировку системы, дополненной AVJ, доказывая ее эквивалентность физическому манипулятору. Проверка на шестистепенной человекоподобной руке демонстрирует кинематическую согласованность с точностью до машинного значения и, посредством динамического моделирования в MATLAB, подтверждает возможность вычисления физически согласованных моментов в суставах — вычисление, которое было бы невозможно для среднего шарнира рыскания в вырожденной модели из-за неопределенных инерционных свойств разрушенного звена.</p></abstract><trans-abstract xml:lang="en"><p>The Denavit-Hartenberg (DH) convention, while foundational in robot kinematics, contains a critical representational flaw in a specific class of anthropomorphic manipulators. This paper identifies and formalizes the "vanishing length problem", a singularity arising in kinematic chains featuring three consecutive joints where the z (yaw), x (roll), and y (pitch) axes form a mutually orthogonal triad. This configuration, characteristic of sequences like Roll-Yaw-Pitch or Pitch-Yaw-Roll, causes the origin of the middle (yaw) joint’s frame to become coincident with the origin of the subsequent joint’s frame. Consequently, the two physical link lengths preceding and following the yaw joint collapse into a single, combined length in the kinematic model, thereby losing a critical degree of freedom in the representation. We introduce the Auxiliary Virtual Joint (AVJ), a passive joint with a fixed constraint, to decouple this collapsed chain. The AVJ reintroduces the missing frame origin, restoring the two distinct link lengths and ensuring kinematic integrity. We provide a complete kinematic and dynamic formulation of the AVJ-augmented system, proving its equivalence to the physical manipulator. Validation on a 6-DoF humanoid arm demonstrates kinematic consistency to machine precision and, through dynamic simulations in MATLAB, confirms the feasibility of computing physically consistent joint torques—a computation rendered impossible for the middle yaw joint in the degenerate model due to the indeterminate inertial properties of the collapsed link.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>антропоморфный манипулятор</kwd><kwd>человекоподобный робот</kwd><kwd>карданная блокировка</kwd><kwd>вспомогательный виртуальный шарнир</kwd><kwd>исчезающая длина</kwd><kwd>ортогональная триада</kwd></kwd-group><kwd-group xml:lang="en"><kwd>anthropomorphic manipulator</kwd><kwd>human-like robot</kwd><kwd>gimbal lock</kwd><kwd>auxiliary virtual joint</kwd><kwd>vanishing length</kwd><kwd>orthogonal triad</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">Denavit J., Hartenberg R. 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