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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">ntv</journal-id><journal-title-group><journal-title xml:lang="ru">Научно-технический вестник информационных технологий, механики и оптики</journal-title><trans-title-group xml:lang="en"><trans-title>Scientific and Technical Journal of Information Technologies, Mechanics and Optics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-1494</issn><issn pub-type="epub">2500-0373</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2226-1494-2024-24-3-500-504</article-id><article-id custom-type="elpub" pub-id-type="custom">ntv-359</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>МАТЕМАТИЧЕСКОЕ И КОМПЬЮТЕРНОЕ МОДЕЛИРОВАНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MODELING AND SIMULATION</subject></subj-group></article-categories><title-group><article-title>О влиянии сосредоточенного включения на спектр собственных колебаний струны и балки Бернулли–Эйлера</article-title><trans-title-group xml:lang="en"><trans-title>On the influence of a concentrated inclusion on the spectrum of natural vibrations of a string and Bernoulli-Euler beam</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0137-152X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вавилов</surname><given-names>Д. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Vavilov</surname><given-names>D. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вавилов Дмитрий Сергеевич — кандидат физико-математических наук, доцент</p><p>Санкт-Петербург, 197198</p></bio><bio xml:lang="en"><p>Dmitry S. Vavilov — PhD (Physics &amp; Mathematics), Associate Professor</p><p>Saint Petersburg, 197198</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2691-7680</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Головина</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Golovina</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Головина Виктория Владимировна — кандидат технических наук, доцент, доцент</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Victoria V. Golovina — PhD, Associate Professor, Associate Professor</p><p>Saint Petersburg, 197198</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1228-8377</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кудрявцев</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kudryavtsev</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кудрявцев Алексей Андреевич — инженер-исследователь</p><p>Санкт-Петербург, 195251</p></bio><bio xml:lang="en"><p>Aleksey A. Kudryavtsev — Research Engineer</p><p>Saint Petersburg, 195251</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Военно-космическая академия имени А.Ф. Можайского</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Mozhaisky Military Aerospace Academy</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Санкт-Петербургский политехнический университет Петра Великого</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Peter the Great St. Petersburg Polytechnic University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>19</day><month>12</month><year>2024</year></pub-date><volume>24</volume><issue>3</issue><fpage>500</fpage><lpage>504</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Вавилов Д.С., Головина В.В., Кудрявцев А.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Вавилов Д.С., Головина В.В., Кудрявцев А.А.</copyright-holder><copyright-holder xml:lang="en">Vavilov D.S., Golovina V.V., Kudryavtsev A.A.</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://ntv.elpub.ru/jour/article/view/359">https://ntv.elpub.ru/jour/article/view/359</self-uri><abstract><p>Предмет исследования. Представлены результаты исследования малых поперечных колебаний струны и балки Бернулли–Эйлера с сосредоточенным включением. Физические характеристики струны и балки считаются постоянными величинами, а включение моделируется с помощью дельта-функции Дирака и описывается двумя параметрами: местоположением и массой. Рассматривается задача об определении этих параметров по измерению сдвига резонансной частоты. Метод. В качестве основного метода исследования предложено разложение функции перемещения по собственным формам. Коэффициенты разложения определяются с помощью метода Гринберга. В случае точечного дефекта их подстановка в исходное разложение позволяет получить характеристическое уравнение, определяющее влияние включения на собственные частоты струны и балки. Основные результаты. Представлено аналитическое решение задачи о малых поперечных колебаниях струны и балки Бернулли–Эйлера с точечным включением. Предложен метод нахождения частотных уравнений, полностью определяющих его влияние на спектр колебаний. На основе предложенного метода выведены соотношения, позволяющие идентифицировать параметры включения, получены зависимости этих параметров от сдвига резонансной частоты. Показана возможность независимого определения массы и местоположения дефекта по измерению сдвига двух собственных частот. Обсуждение. Работа направлена на развитие аналитических методов моделирования динамики континуальных механических систем с неоднородной структурой. Описание их динамического отклика представляет значительный практический интерес при создании различного типа датчиков, таких как акселерометры, датчики скорости, давления и другие. Полученные результаты могут быть использованы при разработке детекторов массы, работа которых основана на изменении собственной частоты колебаний.</p></abstract><trans-abstract xml:lang="en"><p>The results of a study of small transverse vibrations of a string and Bernoulli-Euler beam with a concentrated inclusion are presented. The physical properties of the string and the beam are assumed to be constant, the inclusion is modeled using the Dirac delta function and described by two parameters: location and mass. The problem of determining these parameters by measuring the shift of the resonant frequency is considered. The basic method is the eigenfunction expansion of displacement. Expansion coefficients are determined using the Greenberg method. Their substitution into the original expansion in the case of a point defect allows us to obtain a characteristic equation that determines the effect of inclusion on the string and beam natural frequencies. An analytical solution to the problem of small transverse vibrations of a string and Bernoulli-Euler beam with a point inclusion is presented. A method for possesing frequency equations that completely determine the influence of inclusion on the oscillation spectrum is proposed. Basing on the proposed method, expressions for identifying the inclusion parameters are derived, and the dependences of these parameters on the resonant frequency shift are presented. The possibility of independently determining the mass and location of the defect by measuring the shift of two natural frequencies is shown. The work is aimed at developing analytical methods for modeling the dynamics of continuum mechanical systems with a heterogeneous structure. The description of their dynamic response is of significant practical interest for creating various types of sensors, such as accelerometers, speed sensors, pressure sensors and others. The results obtained in this article can be used in the elaboration of mass detectors, the operation of which is based on changes in the natural frequency of oscillations.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>балка Бернулли–Эйлера</kwd><kwd>струна</kwd><kwd>спектральная задача</kwd><kwd>собственные частоты</kwd><kwd>сосредоточенное включение</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Bernoulli-Euler beam</kwd><kwd>string</kwd><kwd>spectral problem</kwd><kwd>natural frequencies</kwd><kwd>concentrated inclusion</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Glazov A.L., Muratikov K.L. Generalized thermoelastic effect in real metals and its application for describing photoacoustic experiments with Al membranes // Journal of Applied Physics. 2020. V. 128. N 9. 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