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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">35057</article-id><article-id pub-id-type="doi">10.22363/2312-8143-2023-24-1-7-16</article-id><article-id pub-id-type="edn">FBBFIL</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">Designing the low-energy lunar transfers trajectories which pass in the vicinity of the libration points of the Earth - Moon system. Part 1. Theory and method</article-title><trans-title-group xml:lang="ru"><trans-title>Проектирование низкоэнергетических лунных перелетов, траектория которых проходит в окрестности точек либрации системы Земля - Луна. Часть 1. Теория и метод</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0138-6190</contrib-id><contrib-id contrib-id-type="scopus">55396771600</contrib-id><contrib-id contrib-id-type="spin">3030-7494</contrib-id><name-alternatives><name xml:lang="en"><surname>Konstantinov</surname><given-names>Mikhail S.</given-names></name><name xml:lang="ru"><surname>Константинов</surname><given-names>Михаил Сергеевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Sciences (Techn.), Professor of the Space Systems and Rocket Science Department, Aerospace Institute</p></bio><bio xml:lang="ru"><p>доктор технических наук, профессор кафедры космических систем и ракетостроения, Аэрокосмический институт</p></bio><email>mkonst@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-1159-3292</contrib-id><name-alternatives><name xml:lang="en"><surname>Thant</surname><given-names>Aung Myo</given-names></name><name xml:lang="ru"><surname>Тант</surname><given-names>Аунг Мьо</given-names></name></name-alternatives><bio xml:lang="en"><p>PhD student, Space Systems and Rocket Science Department, Aerospace Institute</p></bio><bio xml:lang="ru"><p>аспирант, кафедра космических систем и ракетостроения, Аэрокосмический институт</p></bio><email>aungmyothant4696@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Moscow Aviation Institute (National Research University)</institution></aff><aff><institution xml:lang="ru">Московский авиационный институт (национальный исследовательский университет)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-06-25" publication-format="electronic"><day>25</day><month>06</month><year>2023</year></pub-date><volume>24</volume><issue>1</issue><issue-title xml:lang="en">VOL 24, NO1 (2023)</issue-title><issue-title xml:lang="ru">ТОМ 24, №1 (2023)</issue-title><fpage>7</fpage><lpage>16</lpage><history><date date-type="received" iso-8601-date="2023-06-26"><day>26</day><month>06</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Konstantinov M.S., Thant A.M.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Константинов М.С., Тант А.М.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Konstantinov M.S., Thant A.M.</copyright-holder><copyright-holder xml:lang="ru">Константинов М.С., Тант А.М.</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/">https://creativecommons.org/licenses/by-nc/4.0/legalcode</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/engineering-researches/article/view/35057">https://journals.rudn.ru/engineering-researches/article/view/35057</self-uri><abstract xml:lang="en"><p style="text-align: justify;">A method for designing low-energy trajectory of transfer to the Moon with the insertion of a spacecraft into a low circumlunar orbit is proposed. The analysis of this trajectory is based on the solution of a boundary value problem for the system of differential equations of the restricted four-body problem. The trajectory of the low-energy flight passes through a region of space where the gravitational attraction of the Earth, the Moon, and the Sun tend to cancel. The trajectory turns out to be very sensitive to the initial conditions of the spacecraft motion. Difficulties arise in solving the boundary value problem. Weak stability boundary issue appears. An additional difficulty in designing the trajectory of a low-energy transfer of a spacecraft is related to the multi-extremality of the optimization problem under consideration. The authors assume that the transfer trajectory passes in the vicinity of the libration point L1 or L2 of the Earth - Moon system and introduces some restrictions on the velocity vector of the spacecraft at the moment the spacecraft passes the vicinity of the libration point. This assumption and the use of enumeration in space of the two main parameters of the transfer pattern allows to find an initial approximation for the low-energy transfer trajectory.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Предложен метод проектирования низкоэнергетических перелетов к Луне с выведением космического аппарата на низкую окололунную орбиту. Анализ траектории низкоэнергетического лунного перелета основывается на решении краевой задачи для системы дифференциальных уравнений ограниченной задачи четырех тел. Траектория низкоэнергетического перелета проходит через область пространства, где гравитационное притяжение Земли, Луны и Солнца очень близки. Поэтому траектория оказывается крайне чувствительной к начальным условиям движения космического аппарата и возникает проблема при решении краевой задачи. Дополнительная трудность проектирования траектории низкоэнергетического лунного перелета связана с многоэкстремальностью рассматриваемой оптимизационной проблемы. В исследовании выдвигается предположение, что перелетная траектория проходит в окрестности точки либрации L1 или L2 системы Земля - Луна и вводятся некоторые ограничения на вектор скорости космического аппарата в момент прохождения им окрестности точки либрации. Данное предположение с использованием перебора в пространстве двух основных параметров схемы перелета позволяет найти начальное приближение для траектории низкоэнергетического перелета.</p></trans-abstract><kwd-group xml:lang="en"><kwd>weak stability boundary</kwd><kwd>low-energy trajectory</kwd><kwd>flight path</kwd><kwd>Moon</kwd><kwd>gravitational perturbations</kwd><kwd>velocity impulse</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>низкоэнергетическая траектория</kwd><kwd>траектория полета</kwd><kwd>Луна</kwd><kwd>гравитационные возмущения</kwd><kwd>импульс скорости</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The study was carried out with the support of the Russian Science Foundation, project No. 21-19-00683.</funding-statement><funding-statement xml:lang="ru">Исследование выполнено при поддержке Российского научного фонда, проект № 21-19-00683.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Parker JS, Anderson RL. 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