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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">Journal of Applied Mathematics and Mechanics</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Applied Mathematics and Mechanics</journal-title><trans-title-group xml:lang="ru"><trans-title>Прикладная математика и механика</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0032-8235</issn><issn publication-format="electronic">3034-5758</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">700387</article-id><article-id pub-id-type="doi">10.7868/S3034575825060046</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">Topology optimization of mechanoacoustic systems</article-title><trans-title-group xml:lang="ru"><trans-title>Топологическая оптимизация механоакустических систем</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Smirnov</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Смирнов</surname><given-names>С. А.</given-names></name></name-alternatives><email>nvsarge@ipfran.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Suvorov</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Суворов</surname><given-names>А. С.</given-names></name></name-alternatives><email>suvorov@ipfran.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Umnyagin</surname><given-names>G. M.</given-names></name><name xml:lang="ru"><surname>Умнягин</surname><given-names>Г. М.</given-names></name></name-alternatives><email>g.umnyagin@ipfran.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Applied Physics RAS</institution></aff><aff><institution xml:lang="ru">Институт прикладной физики РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2025</year></pub-date><volume>89</volume><issue>6</issue><issue-title xml:lang="en">VOL 89, NO6 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 89, №6 (2025)</issue-title><fpage>926</fpage><lpage>942</lpage><history><date date-type="received" iso-8601-date="2026-01-08"><day>08</day><month>01</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-12-15"/></permissions><self-uri xlink:href="https://cardiosomatics.ru/0032-8235/article/view/700387">https://cardiosomatics.ru/0032-8235/article/view/700387</self-uri><abstract xml:lang="en"><p>The problem reducing of noise radiation represents one of the key problems in the field of acoustics. As a more effective approach to solving it, the use of topological optimization is proposed, the purpose of which is to rebuild the geometry of the structure and change the parameters of the structural material in the selected volume in accordance with specified loads and restrictions. The solution to the problem of noise minimization in mechanoacoustic systems characterized by the presence of sources of harmonic vibrations using a modified solid isotropic material with penalty (SIMP) algorithm is considered. The pressure intensity at the outer boundary of the liquid is used as the objective function, the transition to which allows the use of various types of harmonic sources in applied problems. To take this aspect into account, changes were introduced into the algorithm to allow optimization using range of frequencies. The results of numerical testing of the approach are demonstrated, obtained by solving next problems: minimizing the emitted noise of a steel frame immersed in water under the influence of a periodic force on its wall. For posed problems, optimal distributions of material in the computational domain of the structure were found, which led to a decrease in the average pressure level at the outer boundary of the liquid by 10 dB. In addition, visualizations of the pressure field in the liquid and structure vibrations were obtained before and after the optimization procedure.</p></abstract><trans-abstract xml:lang="ru"><p>Проблема снижения шумового излучения представляет собой одну из ключевых задач в области акустики. В качестве более эффективного подхода к ее решению предлагается применение топологической оптимизации, целью которой является перестроение геометрии структуры и изменение параметров материала конструкции в выбранном объеме в соответствии с заданными нагрузками и ограничениями. Рассмотрено новое решение задачи минимизации шума в механоакустических системах, характеризующихся наличием источников гармонических колебаний, посредством модификации известного алгоритма “твердого изотропного материала со штрафами” (SIMP). В качестве целевой функции используется интенсивность давления на внешней границе жидкости, переход к которой позволяет использовать в прикладных задачах различные виды гармонических источников. Предложено развитие алгоритма, позволяющее проводить оптимизацию в заданном диапазоне частот. Продемонстрированы результаты численной апробация подхода, полученные в ходе решения двумерной задачи: минимизации излучаемого шума стальной оболочкой, погруженной в воду, при воздействии периодической точечной силы на ее стенку. Для нескольких поставленных задач были найдены оптимальные распределения материала в расчетной области конструкции, что привело к снижению среднего уровня давления на внешней границе жидкости на 10 дБ. Представлены визуализации поля давления в жидкости и колебаний структуры до и после процедуры оптимизации, а также спектральные характеристики полученной системы.</p></trans-abstract><kwd-group xml:lang="en"><kwd>topology optimization</kwd><kwd>harmonic analysis</kwd><kwd>acoustics</kwd><kwd>pressure intensity</kwd><kwd>noise reduction</kwd><kwd>SIMP</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>топологическая оптимизация</kwd><kwd>гармонический анализ</kwd><kwd>акустика</kwd><kwd>интенсивность давления</kwd><kwd>снижение шумов</kwd><kwd>SIMP</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Michell A.G. LVIII. The limits of economy of material in frame-structures // Philosophical Magazine. 1904. V. 1. № 8. P. 589–597. https://dx.doi.org/10.1080/14786440409463229</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Bendsøe M.P. Optimization of Structural Topology, Shape and Material. 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