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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">omna</journal-id><journal-title-group><journal-title xml:lang="ru">Омский научный вестник</journal-title><trans-title-group xml:lang="en"><trans-title>Omsk Scientific Bulletin</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1813-8225</issn><issn pub-type="epub">2541-7541</issn><publisher><publisher-name>Омский государственный технический университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25206/1813-8225-2025-196-5-11</article-id><article-id custom-type="edn" pub-id-type="custom">WRXPUZ</article-id><article-id custom-type="elpub" pub-id-type="custom">omna-149</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>МАШИНОСТРОЕНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MECHANICAL ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Конструирование PH-кривой пространства по ортогональным проекциям её годографа</article-title><trans-title-group xml:lang="en"><trans-title>Construction of a PH-curve of space by orthogonal projections of its hodograph</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9302-8560</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Панчук</surname><given-names>К. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Panchuk</surname><given-names>K. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Константин Леонидович Панчук, доктор технических наук, доцент (Россия), профессор</p><p>кафедра «Инженерная геометрия и САПР»</p><p>644050; пр. Мира, 11; Омск</p><p>AuthorID (РИНЦ): 501163; AuthorID (SCOPUS): 55857766100; ResearcherID: S-2788-2017</p></bio><bio xml:lang="en"><p>Konstantin Leonidovich Panchuk, Doctor of Technical Sciences, Associate Professor, Professor</p><p>Engineering Geometry and CAD Department</p><p>644050; Mira Ave., 11; Omsk</p><p>AuthorID (RSCI): 501163; AuthorID (SCOPUS): 55857766100; ResearcherID: S-2788-2017</p></bio><email xlink:type="simple">Panchuk_KL@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9641-9417</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мясоедова</surname><given-names>Т. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Myasoedova</surname><given-names>T. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Татьяна Михайловна Мясоедова, кандидат технических наук, доцент</p><p>кафедра «Инженерная геометрия и САПР»</p><p>644050; пр. Мира, 11; Омск</p><p>AuthorID (РИНЦ): 686836; AuthorID (SCOPUS): 57201776004; ResearcherID: E-7505-2014</p></bio><bio xml:lang="en"><p>Tatyana Mikhaylovna Myasoedova, Candidate of Technical Sciences, Senior Lecturer</p><p>Engineering Geometry and CAD Department</p><p>AuthorID (RSCI): 686836; AuthorID (SCOPUS): 57201776004; ResearcherID: E-7505-2014</p><p>644050; Mira Ave., 11; Omsk</p><p>AuthorID (RSCI): 686836; AuthorID (SCOPUS): 57201776004; ResearcherID: E-7505-2014</p></bio><email xlink:type="simple">mtm44mtm44@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2499-4866</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Любчинов</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Lyubchinov</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Евгений Владимирович Любчинов, кандидат технических наук, доцент</p><p>кафедра «Инженерная геометрия и САПР»</p><p>644050; пр. Мира, 11; Омск</p><p>AuthorID (РИНЦ): 917932; AuthorID (SCOPUS): 57199399265; ResearcherID: D-1882-2019</p></bio><bio xml:lang="en"><p>Evgeniy Vladimirovich Lyubchinov, Candidate of Technical Sciences, AssociateProfessor</p><p>Engineering Geometry and CAD Department</p><p>644050; Mira Ave., 11; Omsk</p><p>AuthorID (RSCI): 917932; AuthorID (SCOPUS): 57199399265; ResearcherID: D-1882-2019</p></bio><email xlink:type="simple">Lubchinov.E.V@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Омский государственный технический университет<country>Россия</country></aff><aff xml:lang="en">Omsk State Technical University<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>30</day><month>12</month><year>2025</year></pub-date><volume>0</volume><issue>4</issue><fpage>5</fpage><lpage>11</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Панчук К.Л., Мясоедова Т.М., Любчинов Е.В., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Панчук К.Л., Мясоедова Т.М., Любчинов Е.В.</copyright-holder><copyright-holder xml:lang="en">Panchuk K.L., Myasoedova T.M., Lyubchinov E.V.</copyright-holder><license 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://onv.omgtu.ru/jour/article/view/149">https://onv.omgtu.ru/jour/article/view/149</self-uri><abstract><p>   В современном геометрическом моделировании известен класс плоских и пространственных PH-кривых (кривых пифагорова годографа), получивших теоретическое обоснование математиком Рида Т. Фаруки в 2007 г. PH-кривые обладают уникальным свойством, имеющим важное значение в решении множества разноплановых практических задач, а именно «параметрическая скорость» этих кривых, т. е. производная от длины дуги по параметру кривой, является полиномиальной (или рациональной) функцией параметра. Данное свойство обусловлено тем, что координатные компоненты годографа PH-кривой представляют собой элементы пифагорова (n + 1)-кортежа координатных полиномов. Благодаря отмеченному свойству PH-кривые востребованы в решениях различных практических задач: генерация траекторий беспилотных летательных аппаратов, оптимизация пути мобильных роботов, расчёт оптимальных по форме и по длине сегментов оси автомобильной дороги и др. В теории пространственных PH-кривых разработаны алгоритмы их аналитического конструирования. В указанном исследовании предложен подход к конструированию этих кривых, основанный на теории плоских PH-кривых и реализуемый последовательным конструированием образов — проекций пространственных PH-кривых на двух координатных плоскостях. Решение пространственной задачи конструирования сводится к решениям двух задач последовательного конструирования на координатных плоскостях. Приведены числовые примеры, демонстрирующие работоспособность предлагаемого подхода. При этом алгоритмы вычислений более просты, чем в случае известного пространственного аналитического подхода. В направлении развития предложенного подхода приведены числовые примеры конструирования пространственной составной PH-кривой по гладкости C1.</p></abstract><trans-abstract xml:lang="en"><p>   In modern geometric modeling, a class of plane and spatial PH-curves (рythagorean hodograph curves) is known, which were theoretically substantiated by mathematician Rida T. Farouki in 2007. PH-curves have a unique property that is important in solving many different practical problems, namely: the "parametric speed" of these curves, i.e. the derivative of the arc length with respect to the curve parameter, is a polynomial (or rational) function of the parameter. This property is due to the fact that the coordinate components of the hodograph of the PH–curve are elements of the Pythagorean (n + 1)-tuple of coordinate polynomials. Due to this property, PH-curves are in demand in solving various practical problems: generating trajectories for UAVs (unmanned aerial vehicles), optimizing the path of mobile robots, calculating segments of the axis of a road that are optimal in shape and length, etc. etc. In the theory of spatial PH-curves, algorithms for their analytical construction have been developed. In this paper, an approach to constructing these curves is proposed, based on the theory of plane PH-curves and implemented by sequentially constructing images-projections of spatial PH-curves on two coordinate planes. That is, solving the spatial construction problem is reduced to solving two problems of sequential construction on coordinate planes. Numerical examples are given that demonstrate the efficiency of the proposed approach. At the same time, the calculation algorithms are simpler than in the case of the known spatial analytical approach. In the direction of developing the proposed approach, numerical examples of constructing a spatial composite PH-curve by smoothness C1 are given.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>PH-кривые</kwd><kwd>пифагоровы годографы</kwd><kwd>полиномы</kwd><kwd>ортогональная проекция</kwd><kwd>составная кривая</kwd><kwd>гладкость стыковки</kwd></kwd-group><kwd-group xml:lang="en"><kwd>PH-curves</kwd><kwd>рythagorean hodographs</kwd><kwd>polynomials</kwd><kwd>orthogonal projection</kwd><kwd>composite curve</kwd><kwd>smoothness of connection</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Авторы не имеют финансовой заинтересованности в представленных материалах и методах</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>The authors have no financial interest in the presented materials or methods</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Farouki R. T. Pythagorean-hodograph curves: Algebra and geometry inseparable. Germany: Springer, 2008. 729 p. DOI: 10.1007/978-3-540-73398-0. ISBN 978-3-540-73397-3.</mixed-citation><mixed-citation xml:lang="en">Farouki R. T. Pythagorean-hodograph curves: Algebra and geometry inseparable. Germany: Springer, 2008. 729 p. DOI: 10.1007/978-3-540-73398-0. ISBN 978-3-540-73397-3.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Farouki R. T., Sakkalis T. Pythagorean-hodograph space curves. Advances in Computational Mathematics. 1994. No. 2. P. 41–66. DOI: 10.1007/BF02519035.</mixed-citation><mixed-citation xml:lang="en">Farouki R. T., Sakkalis T. Pythagorean-hodograph space curves. Advances in Computational Mathematics. 1994. No. 2. P. 41–66. DOI: 10.1007/BF02519035.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Pottmann H. Curve design with rational Pythagoreanhodograph curves. Advances in Computational Mathematics. 1995. No. 3. P. 147–170. DOI: 10.1007/BF03028365.</mixed-citation><mixed-citation xml:lang="en">Pottmann H. Curve design with rational Pythagoreanhodograph curves. Advances in Computational Mathematics. 1995. No. 3. P. 147–170. DOI: 10.1007/BF03028365.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Farouki R. T. Arc lengths of rational Pythagoreanhodograph curves. Computer Aided Geometric Design. 2015. No. 34. P. 1–4. DOI: 10.1016/j.cagd.2015.03.007.</mixed-citation><mixed-citation xml:lang="en">Farouki R. T. Arc lengths of rational Pythagoreanhodograph curves. Computer Aided Geometric Design. 2015. No. 34. P. 1–4. DOI: 10.1016/j.cagd.2015.03.007.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Farouki R. T. The elastic bending energy of Pythagoreanhodograph curves. Computer Aided Geometric Design. 1996. No. 13. P. 227–241. DOI: 10.1016/0167-8396(95)00024-0.</mixed-citation><mixed-citation xml:lang="en">Farouki R. T. The elastic bending energy of Pythagoreanhodograph curves. Computer Aided Geometric Design. 1996. No. 13. P. 227–241. DOI: 10.1016/0167-8396(95)00024-0.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Винокурский Д. Л., Ганьшин К. Ю., Мезенцева О. С. [и др.]. Планирование траектории группы беспилотных летательных аппаратов с использованием годографа Пифагора и составных кривых Бернштейна-Безье на плоскости // Вестник КРАУНЦ. Физико-математические науки. 2020. Т. 31, № 2. С. 70–78. DOI: 10.26117/2079-6641-2020-31-2-70-78. EDN: DWGUPX.</mixed-citation><mixed-citation xml:lang="en">Vinokurskiy D. L., Gan’shin K. Yu., Mezentseva O. S. [et al.]. Planirovaniye trayektorii gruppy bespilotnykh letatel’nykh apparatov s ispol’zovaniyem godografa Pifagora i sostavnykh krivykh Bernshteyna-Bez’ye na ploskosti [The planning of the trajectory of UAV group with the performance of pythagorean hodograph and Bernstein-Bezier composite curves in the plane]. Vestnik KRAUNTs. Fiziko-matematicheskiye nauki. Bulletin KRASEC. Physical and Mathematical Sciences. Vol. 31, no. 2. P. 70–78. DOI: 10.26117/2079-6641-2020-31-2-70-78. EDN: DWGUPX. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Farouki R. T. Pythagorean-hodograph curves in practical use. Geometry Processing for Design and Manufacturing. Society for Industrial and Applied Mathematics. 1992. P. 3–33.</mixed-citation><mixed-citation xml:lang="en">Farouki R. T. Pythagorean-hodograph curves in practical use. Geometry Processing for Design and Manufacturing. Society for Industrial and Applied Mathematics. 1992. P. 3–33.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Shah M. A., Aouf N. 3D cooperative Pythagorean hodograph path planning and obstacle avoidance for multiple UAVs. IEEE 9&lt;sup&gt;th&lt;/sup&gt; International Conference on Cybernetic Intelligent Systems, CIS. 2010. P. 1–6. DOI: 10.1109/UKRICIS.2010.5898124.</mixed-citation><mixed-citation xml:lang="en">Shah M. A., Aouf N. 3D cooperative Pythagorean hodograph path planning and obstacle avoidance for multiple UAVs. IEEE 9&lt;sup&gt;th&lt;/sup&gt; International Conference on Cybernetic Intelligent Systems, CIS. 2010. P. 1–6. DOI: 10.1109/UKRICIS.2010.5898124.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Vinokursky D. L., Mezentseva O. S., Samoylov Ph. V. [et al.]. Model predictive control for path planning of UAV group. IOP Conference Series: Materials Science and Engineering : III International Scientific Conference. Krasnoyarsk: IOP Publishing Ltd. 2021. DOI: 10.1088/1757-899X/1155/1/012092.</mixed-citation><mixed-citation xml:lang="en">Vinokursky D. L., Mezentseva O. S., Samoylov Ph. V. [et al.]. Model predictive control for path planning of UAV group. IOP Conference Series: Materials Science and Engineering : III International Scientific Conference. Krasnoyarsk: IOP Publishing Ltd. 2021. DOI: 10.1088/1757-899X/1155/1/012092.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Ганьшин К. Ю., Винокурский Д. Л., Мезенцева О. С. [и др.]. Разработка метода оптимизации траектории облета среды с препятствиями на основе кривых Безье с годографом Пифагора // Инженерный вестник Дона. 2023. № 7(103). С. 156–165. EDN: KRTRRN.</mixed-citation><mixed-citation xml:lang="en">Gan’shin K. Yu., Vinokurskiy D. L., Mezentseva O. S. [et al.]. Razrabotka metoda optimizatsii trayektorii obleta sredy s prepyatstviyami na osnove krivykh Bez’ye s godografom Pifagora [Development of a method for optimizing the trajectory of a obstacle-free environment based on Bezier curves with a Pythagorean hodograph]. Inzhenernyy vestnik Dona. Engineering Journal of Don. 2023. No. 7(103). P. 156–165.E EDN: KRTRRN. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Винокурский Д. Л., Ганьшин К. Ю., Мезенцева О. С. [и др.]. Генерация траекторий оптимальных кривых беспилотного летательного аппарата для обхода статического препятствия // Инженерный вестник Дона. 2021. № 9(81). С. 169–181. EDN: LPFIMQ.</mixed-citation><mixed-citation xml:lang="en">Vinokurskiy D. L., Gan’shin K. Yu., Mezentseva O. S. [et al.]. Generatsiya trayektoriy optimal’nykh krivykh bespilotnogo letatel’nogo apparata dlya obkhoda staticheskogo prepyatstviya [Generating trajectories of optimal curves of an unmanned aerial vehicle to bypass a static obstacle]. Inzhenernyy vestnik Dona. Engineering Journal of Don. 2021. No. 9(81). P. 169–181. EDN: LPFIMQ. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Bezawada H., Woods C., Vikas V. Shape estimation of soft manipulators using piecewise continuous Pythagorean-hodograph curves. American Control Conference (ACC). 2022. P. 2905–2910. DOI: 10.23919/ACC53348.2022.9867270.</mixed-citation><mixed-citation xml:lang="en">Bezawada H., Woods C., Vikas V. Shape estimation of soft manipulators using piecewise continuous Pythagorean-hodograph curves. American Control Conference (ACC). 2022. P. 2905–2910. DOI: 10.23919/ACC53348.2022.9867270.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Bruyninckx H., Reynaerts D. Path planning for mobile and hyper-redundant robots using Pythagorean-hodograph curves. Advanced Robotics: 8th International Conference. 1997. P. 595–600. DOI: 10.1109/ICAR.1997.620243.</mixed-citation><mixed-citation xml:lang="en">Bruyninckx H., Reynaerts D. Path planning for mobile and hyper-redundant robots using Pythagorean-hodograph curves. Advanced Robotics: 8th International Conference. 1997. P. 595–600. DOI: 10.1109/ICAR.1997.620243.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Farouki R. T., Knez M., Vitrih V. [et al.]. Planar projections of spatial Pythagorean-hodograph curves. Computer Aided Geometric Design. 2021. Vol. 91. P. 102049. DOI: 10.1016/j.cagd.2021.102049.</mixed-citation><mixed-citation xml:lang="en">Farouki R. T., Knez M., Vitrih V. [et al.]. Planar projections of spatial Pythagorean-hodograph curves. Computer Aided Geometric Design. 2021. Vol. 91. P. 102049. DOI: 10.1016/j.cagd.2021.102049.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Panchuk K. L., Myasoedova T. M., Rogoza Y. A. Spatial spline construction through the Monge model. CEUR Workshop Proceedings. 2020. Vol. 2744. P. 60-1–60-11. DOI: 10.51130/graphicon-2020-2-3-60.</mixed-citation><mixed-citation xml:lang="en">Panchuk K. L., Myasoedova T. M., Rogoza Y. A. Spatial spline construction through the Monge model. CEUR Workshop Proceedings. 2020. Vol. 2744. P. 60-1–60-11. DOI: 10.51130/graphicon-2020-2-3-60.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Корчагин Д. С., Панчук К. Л. Программа «Вычисление кривизны и кручения пространственной кривой линии по ее ортогональным проекциям» // Хроники объединённого фонда электронных ресурсов «Наука и образование». 2014. Т. 1, № 2 (57). С. 60. EDN: SXMEQB.</mixed-citation><mixed-citation xml:lang="en">Korchagin D. S., Panchuk K. L. Programma “Vychisleniye krivizny i krucheniya prostranstvennoy krivoy linii po eye ortogonal’nym proyektsiyam” [The program “Calculating the curvature and torsion of the dimensional curve based on its orthogonal projections”]. Khroniki Ob”yedinennogo Fonda Elektronnykh Resursov “Nauka i Obrazovaniye”. 2014. Vol. 1, no. 2 (57). P. 60. EDN: SXMEQB. (In Russ.).</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
