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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">cheb</journal-id><journal-title-group><journal-title xml:lang="ru">Чебышевский сборник</journal-title><trans-title-group xml:lang="en"><trans-title>Chebyshevskii Sbornik</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-8383</issn><publisher><publisher-name>Tula State Lev Tolstoy  Pedagogical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22405/2226-8383-2021-22-3-368-382</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1097</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>История математики и приложений</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Сomputer science</subject></subj-group></article-categories><title-group><article-title>О применении теоретико-числовых сеток в задачах акустики</article-title><trans-title-group xml:lang="en"><trans-title>About application of number-theoretic grids in problems of acoustics</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>Добровольский</surname><given-names>Николай Николаевич</given-names></name><name name-style="western" xml:lang="en"><surname>Dobrovol’skii</surname><given-names>Nikolai Nikolaevich</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук</p></bio><bio xml:lang="en"><p>candidate of physical and mathematical sciences</p></bio><email xlink:type="simple">Nikolai.Dobrovolsky@gmail.com</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>Скобельцын</surname><given-names>Сергей Алексеевич</given-names></name><name name-style="western" xml:lang="en"><surname>Skobel’tsyn</surname><given-names>Sergey Alekseevich</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, доцент</p></bio><bio xml:lang="en"><p>candidate of physical and mathematical sciences, associateprofessor</p></bio><email xlink:type="simple">skbl@rambler.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Толоконников</surname><given-names>Лев Алексеевич</given-names></name><name name-style="western" xml:lang="en"><surname>Tolokonnikov</surname><given-names>Lev Alekseevich</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, профессор</p></bio><bio xml:lang="en"><p>doctor of physical and mathematical sciences, professor</p></bio><email xlink:type="simple">TolokonnikovLA@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ларин</surname><given-names>Николай Владимирович</given-names></name><name name-style="western" xml:lang="en"><surname>Larin</surname><given-names>Nikolai Vladimirovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук</p></bio><bio xml:lang="en"><p>candidate of physical and mathematical sciences</p></bio><email xlink:type="simple">Larin220577@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Тульский государственный педагогический университет им. Л. Н. Толстого, Тульский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tula State Lev Tolstoy Pedagogical University, Tula State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Тульский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tula State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>12</day><month>11</month><year>2021</year></pub-date><volume>22</volume><issue>3</issue><fpage>368</fpage><lpage>382</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Добровольский Н.Н., Скобельцын С.А., Толоконников Л.А., Ларин Н.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Добровольский Н.Н., Скобельцын С.А., Толоконников Л.А., Ларин Н.В.</copyright-holder><copyright-holder xml:lang="en">Dobrovol’skii N.N., Skobel’tsyn S.A., Tolokonnikov L.A., Larin N.V.</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://www.chebsbornik.ru/jour/article/view/1097">https://www.chebsbornik.ru/jour/article/view/1097</self-uri><abstract><p>В статье рассматривается задача дифракции сферической монохроматической звуковой волны на абсолютно жесткой сфере. Для представления рассеянного поля используется представление в виде интеграла Кирхгофа. Это приводит к необходимости решения интегрального уравнения Фредгольма второго рода для определения потенциала скорости в рассеянной волне на поверхности рассеивателя. Показано, что использование квадратурных формул на основе сеток Смоляка позволяет сократить число вычислений при приближенном вычисление интегралов, при решении интегрального уравнения и при вычислениирассеянного поля на поверхности сферы и в дальней зоне. Этот метод сравнивался с методом простых ячеек, который учитывает механическую постановку задачи и имеет тот жепорядок точности. Оценка точности вычисления давления на поверхности сферы и форм-функции рассеянного поля на основе решения интегрального уравнения проводится путемсравнения с аналитическим решением на основе разложения по сферическим волновым функциям.</p></abstract><trans-abstract xml:lang="en"><p>The article discusses spherical diffraction problem monochromatic sound wave absolutely rigid sphere. To represent the scattered field, a representation in the form of a Kirchhoff integral is used. This leads to the need to solve the Fredholm integral equation of the second kind to determine the velocity potential in the scattered wave on the surface of the scatterer. It is shown that the use of quadrature formulas based on number-theoretic grids allows you to reduce the number of calculations for the approximate calculation of integrals, when solving the integral equation and when calculating the scattered field on the surface of the sphere and in the far field. This method was compared with the simple cell method, which takes into account the mechanical formulation of the problem and has the same order of accuracy. Estimation of the accuracy of calculating the pressure on the surface of the sphere and the form-function of the scattered field based on the solution of the integral equation was carried out by comparison with the analytical solution based on the expansion in spherical wave functions.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>дифракция</kwd><kwd>сферические звуковые волны</kwd><kwd>линейные интегральные уравнения</kwd><kwd>интерполяция</kwd><kwd>интерполяционные многочлены</kwd><kwd>квадратурные формулы</kwd><kwd>пери- одизация</kwd><kwd>сетки Смоляка</kwd><kwd>параллелепипедальные сетки.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>diffraction</kwd><kwd>spherical sound wave</kwd><kwd>linear integral equations</kwd><kwd>interpolation</kwd><kwd>interpolation polynomials</kwd><kwd>quadrature formulas</kwd><kwd>periodization</kwd><kwd>Smolyak grids</kwd><kwd>parallelepiped grids.</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено за счет гранта РФФИ 19-41-710005 р_а.</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">S. 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