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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">rmrs</journal-id><journal-title-group><journal-title xml:lang="ru">Научно-технический сборник Российского морского регистра судоходства</journal-title><trans-title-group xml:lang="en"><trans-title>Research Bulletin by Russian Maritime Register of Shipping</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2223-7097</issn><publisher><publisher-name>Российский морской регистр судоходства</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">rmrs-57</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>МОРЕХОДНЫЕ КАЧЕСТВА СУДОВ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SEAWORTHINESS</subject></subj-group></article-categories><title-group><article-title>О влиянии курсового угла и скорости на амплитуды вторых гармоник нелинейной качки судна</article-title><trans-title-group xml:lang="en"><trans-title>Effect of heading angle and velocity on the second harmonics of the nonlinear ship motions amplitudes</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>Семенова</surname><given-names>В. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Semenova</surname><given-names>V. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д-р техн. наук, профессор</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>DSc, professor</p><p>St. Petersburg</p></bio><email xlink:type="simple">sem_viktoria@mail.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>Альбаев</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Albaev</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>St. Petersburg</p></bio><email xlink:type="simple">albaevdanil@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный морской технический университет (СПбГМТУ)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>St. Petersburg State Marine Technical University (SMTU)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>28</day><month>10</month><year>2024</year></pub-date><volume>0</volume><issue>70/71</issue><fpage>46</fpage><lpage>57</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Семенова В.Ю., Альбаев Д.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Семенова В.Ю., Альбаев Д.А.</copyright-holder><copyright-holder xml:lang="en">Semenova V.Y., Albaev D.A.</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://sbornik.rs-class.org/jour/article/view/57">https://sbornik.rs-class.org/jour/article/view/57</self-uri><abstract><p>В статье рассматривается определение нелинейных сил второго порядка и соответствующих амплитуд качки на основании трехмерной потенциальной теории. Для их определения используются методы интегральных уравнений и метод малого параметра. Проводится апробация расчетов амплитуд вторых гармоник по разработанным программам в сравнении с различными программами, основанными на использовании двухмерных методов. Проводится исследование влияния на амплитуды вторых гармоник изменения курсового угла и скорости хода. Расчеты амплитуд приводятся для различных судов. Показано значительное влияние нелинейных сил на амплитуды вертикальной и бортовой качки в зонах супергармонических резонансных режимов при расположении судна лагом и необходимость его учета. Показано определение суммарных амплитудно-частотных характеристик, выполненных с учетом амплитуд вторых гармоник.</p></abstract><trans-abstract xml:lang="en"><p>The article discusses the definition of second-order nonlinear forces and the corresponding motions amplitudes based on three-dimensional potential theory. To determine them, the methods of integral equations and the method of a small parameter have been used. Approbation of the second harmonics amplitude calculations by the developed programs has been carried out in comparison with various programs based on the use of two-dimensional methods. Amplitudes of the second harmonics of the change in heading angle and speed have also been studied. Amplitude calculations have been given for various ships. Significant influence of non-linear forces on the amplitudes of heaving and rolling in the zones of superharmonic resonant modes when the ship is positioned in beam waves and the need to take it into account have been shown, as well as the determination of the total amplitude-frequency characteristics performed taking into account the amplitudes of the second harmonics.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>супергармонический резонанс</kwd><kwd>нелинейные силы</kwd><kwd>метод малого параметра</kwd><kwd>функция Грина</kwd><kwd>трехмерная потенциальная теория</kwd></kwd-group><kwd-group xml:lang="en"><kwd>superharmonic resonance</kwd><kwd>nonlinear forces</kwd><kwd>small parameter method</kwd><kwd>Green's function</kwd><kwd>three-dimensional potential theory</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">Луговский В.В. 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