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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">42378</article-id><article-id pub-id-type="doi">10.22363/2312-8143-2024-25-3-203-215</article-id><article-id pub-id-type="edn">VOAIZM</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">Analysis of the Effects of Numerical Differentiation Methods on the Estimation of Longitudinal Stability and Control Derivatives of the Aircraft Mathematical Model</article-title><trans-title-group xml:lang="ru"><trans-title>Анализ влияния методов численного дифференцирования на оценку производных продольной устойчивости и управляемости математической модели летательного аппарата</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3926-1024</contrib-id><contrib-id contrib-id-type="spin">2472-6853</contrib-id><name-alternatives><name xml:lang="en"><surname>Korsun</surname><given-names>Oleg N.</given-names></name><name xml:lang="ru"><surname>Корсун</surname><given-names>Олег Николаевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Technical Sciences, Head of the Scientific and Educational Center, State Scientific Research Institute of Aviation Systems; Professor, Department of Design and Certification of Aircraft Engineering, Moscow Aviation Institute</p></bio><bio xml:lang="ru"><p>доктор технических наук, руководитель научно-образовательного центра, Государственный научно-исследовательский институт авиационных систем; профессор кафедры проектирования и сертификации авиационной техники, Московский авиационный институт</p></bio><email>marmotto@rambler.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7770-2962</contrib-id><name-alternatives><name xml:lang="en"><surname>Om</surname><given-names>Moung Htang</given-names></name><name xml:lang="ru"><surname>Ом</surname><given-names>Моунг Хтанг</given-names></name></name-alternatives><bio xml:lang="en"><p>Ph.D., Post-doctoral Candidate, Department of Design and Certification of Aircraft Engineering</p></bio><bio xml:lang="ru"><p>кандидат технических наук, докторант кафедры проектирования и сертификации авиационной техники</p></bio><email>mounghtangom50@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4397-9429</contrib-id><name-alternatives><name xml:lang="en"><surname>Goro</surname><given-names>Sekou</given-names></name><name xml:lang="ru"><surname>Горо</surname><given-names>Секу</given-names></name></name-alternatives><bio xml:lang="en"><p>Postgraduate Student, Department of Design and Certification of Aircraft Engineering</p></bio><bio xml:lang="ru"><p>аспирант кафедры проектирования и сертификации авиационной техники</p></bio><email>gorosekoi@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">State Scientific Research Institute of Aviation Systems</institution></aff><aff><institution xml:lang="ru">Государственный научно-исследовательский институт авиационных систем</institution></aff></aff-alternatives><aff-alternatives id="aff2"><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="2024-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2024</year></pub-date><volume>25</volume><issue>3</issue><issue-title xml:lang="en">VOL 25, NO3 (2024)</issue-title><issue-title xml:lang="ru">ТОМ 25, №3 (2024)</issue-title><fpage>203</fpage><lpage>215</lpage><history><date date-type="received" iso-8601-date="2025-01-10"><day>10</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Korsun O.N., Om M.H., Goro S.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Корсун О.Н., Ом М.Х., Горо С.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Korsun O.N., Om M.H., Goro S.</copyright-holder><copyright-holder xml:lang="ru">Корсун О.Н., Ом М.Х., Горо С.</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/42378">https://journals.rudn.ru/engineering-researches/article/view/42378</self-uri><abstract xml:lang="en"><p>The estimation of the longitudinal stability and control derivatives of aircraft mathematical model was performed using the least square method, which requires the use of numerical differentiation. For the purpose of approximating the derivatives of pitch rate, the numerical differentiation methods such as: forward difference method, backward difference method, central difference method, combination of three finite difference methods “gradient” and Poplavsky method are applied. Based on the results that demonstrate the advantages and disadvantages of each of these methods, two approaches are proposed to ensure the improvement of the accuracy of the parameters estimation. The approach proposed in this paper combines the results obtained by separately using three finite difference methods to enhance of the accuracy of parameter estimation. This approach strengthens efficiency and compensates for weaknesses due to the nature and properties of finite difference methods.</p></abstract><trans-abstract xml:lang="ru"><p>Оценка производных продольной устойчивости и управляемости математической модели летательного аппарата проводилось методом наименьших квадратов, применение которого требует использования численного дифференцирования. В целях аппроксимации производных угловой скорости тангажа применены методы численного дифференцирования, такие как метод левосторонней разности, метод правосторонней разности, метод двусторонней разности, комбинация трех методов конечных разностей «gradient» и метод Поплавского. На основании результатов, демонстрирующих преимущества и недостатки каждого из этих методов, разработано два подхода для обеспечения повышения точности оценивания коэффициентов. Предложенный в исследовании подход, путем комбинации результатов, полученных при раздельном использовании трех методов конечных разностей, обеспечивает повышение точности оценивания коэффициентов за счет увеличения эффективности и компенсации недостатков, обусловленных особенностями и свойствами методов конечных разностей.</p></trans-abstract><kwd-group xml:lang="en"><kwd>longitudinal control derivatives</kwd><kwd>parameters estimation</kwd><kwd>finite difference methods</kwd><kwd>Poplavsky method</kwd><kwd>combination of methods</kwd><kwd>combination of results</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>производные продольной управляемости</kwd><kwd>оценка параметров</kwd><kwd>методы конечных разностей</kwd><kwd>метод Поплавского</kwd><kwd>комбинация методов</kwd><kwd>комбинация результатов</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work is partially supported by Russian Foundation for Fundamental Research, project 20-08-00449-a.</funding-statement><funding-statement xml:lang="ru">Исследование частично поддержано Российским фондом фундаментальных исследований, проект 20-08-00449-а.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Anderson JD. 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