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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">RUDN Journal of Engineering Research</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Engineering Research</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Инженерные исследования</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2312-8143</issn><issn publication-format="electronic">2312-8151</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">30478</article-id><article-id pub-id-type="doi">10.22363/2312-8143-2021-22-4-323-328</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">Hydrodynamic surfaces with midsection in the form of Lame curve</article-title><trans-title-group xml:lang="ru"><trans-title>Гидродинамические поверхности с мидель-шпангоутом в форме кривых Ламе</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6232-2676</contrib-id><name-alternatives><name xml:lang="en"><surname>Karnevich</surname><given-names>Valery V.</given-names></name><name xml:lang="ru"><surname>Карневич</surname><given-names>Валерий Вячеславович</given-names></name></name-alternatives><bio xml:lang="en"><p>PhD student, Department of Civil Engineering, Engineering Academy</p></bio><bio xml:lang="ru"><p>магистр техники и технологий, аспирант департамента строительства, Инженерная академия</p></bio><email>valera.karnevich@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples’ Friendship University of Russia (RUDN University)</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-12-30" publication-format="electronic"><day>30</day><month>12</month><year>2021</year></pub-date><volume>22</volume><issue>4</issue><issue-title xml:lang="en">VOL 22, NO4 (2021)</issue-title><issue-title xml:lang="ru">ТОМ 22, №4 (2021)</issue-title><fpage>323</fpage><lpage>328</lpage><history><date date-type="received" iso-8601-date="2022-03-15"><day>15</day><month>03</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Karnevich V.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Карневич В.В.</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Karnevich V.V.</copyright-holder><copyright-holder xml:lang="ru">Карневич В.В.</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/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/engineering-researches/article/view/30478">https://journals.rudn.ru/engineering-researches/article/view/30478</self-uri><abstract xml:lang="en"><p style="text-align: justify;">General representation of ship geometry is given by the method of slicing the ship hull by three mutually perpendicular planes: vertical symmetry plane which runs along the middle of hull width, horizontal plane which divides the hull into underwater and abovewater parts, and vertical plane perpendicular to the other two which coincides with midsection. By taking the same three predefined sections of the theoretical hull shape, it is possible to obtain three algebraic surfaces of different order, which are called hydrodynamic in this article. By introducing alphabetic parameters to signify orders of ship skeleton main curves and then by giving them various numerical values, it is possible to consider a large number of hull shapes, having only three explicit surface equations. Method of deriving the equations, obtained by other authors, using only three explicit algebraic equations is demonstrated. The proposed technique is illustrated on six new ship hull shapes.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Общее представление о геометрических характеристиках формы корпуса судна дает метод сечения корпуса тремя взаимно перпендикулярными плоскостями, а именно вертикальной плоскостью симметрии, проходящей вдоль корпуса посередине ее ширины, горизонтальной плоскостью, делящей судно на надводную и подводную части, и вертикальной плоскостью, перпендикулярной первым двум и совпадающей с мидель-шпангоутом. Имея одну и ту же тройку наперед заданных плоских сечений теоретической формы судна этими плоскостями, можно получить три алгебраические поверхности разного порядка, названные в статье гидродинамическими. Вводя буквенные показатели степеней главных плоских кривых каркаса судна, а затем давая им разные цифровые значения, можно ввести в рассмотрение большое количество форм корпусов при наличии лишь трех явных уравнений поверхностей. Продемонстрировано, как получить уравнения, представленные другими авторами, используя только три явных алгебраических уравнения, описанные в статье. Предложенная методика проиллюстрирована на шести новых формах корпусов судов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>ship surface</kwd><kwd>midsection</kwd><kwd>Lame curve</kwd><kwd>hydrodynamic surface</kwd><kwd>algebraic surface</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>судовая поверхность</kwd><kwd>мидель-шпангоут</kwd><kwd>кривые Ламе</kwd><kwd>гидродинамическая поверхность</kwd><kwd>алгебраическая поверхность</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Doctors LJ. Optimization of marine vessels on the basis of tests on model series. J. Mar. Sci. Technol. 2020;25:887–900. https://doi.org/10.1007/s00773-019-00687-4</mixed-citation><mixed-citation xml:lang="ru">Doctors L.J. 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