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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">Doklady Physics</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Physics</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Физика, технические науки</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-7400</issn><issn publication-format="electronic">3034-5081</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">697839</article-id><article-id pub-id-type="doi">10.7868/S3034508125050055</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ФИЗИКА</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">ON TRANSITION RADIATION IN ACOUSTICS</article-title><trans-title-group xml:lang="ru"><trans-title>О ПЕРЕХОДНОМ ИЗЛУЧЕНИИ В АКУСТИКЕ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rudenko</surname><given-names>O. V.</given-names></name><name xml:lang="ru"><surname>Руденко</surname><given-names>О. В.</given-names></name></name-alternatives><email>rudenko@acs366.phys.msu.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени М.В. Ломоносова</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Prokhorov General Physics Institute, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт общей физики им. А.М. Прохорова Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Schmidt Joint Institute of Physics of the Earth, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт физики Земли им. О.Ю. Шмидта Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-15" publication-format="electronic"><day>15</day><month>09</month><year>2025</year></pub-date><volume>524</volume><issue>1</issue><issue-title xml:lang="en">VOL 524, NO1 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 524, №1 (2025)</issue-title><fpage>33</fpage><lpage>39</lpage><history><date date-type="received" iso-8601-date="2025-12-05"><day>05</day><month>12</month><year>2025</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="2026-09-15"/></permissions><self-uri xlink:href="https://jdigitaldiagnostics.com/2686-7400/article/view/697839">https://jdigitaldiagnostics.com/2686-7400/article/view/697839</self-uri><abstract xml:lang="en"><p>The phenomenon of transition radiation and the analogy between acoustic and optical effects are discussed. Examples are given. The reflection of a single broadband acoustic pressure pulse from a thin, highly contrasting inhomogeneity is calculated. The process of acoustic field generation during abrupt braking of a sphere moving at subsonic speed is analyzed. The possibility of radiation by a vortex generated during the formation of an acoustic flow is discussed, taking into account hydrodynamic nonlinearity. The process of rapid bending of the interface of immiscible liquids caused by a pulse of radiation force, as well as the radiation of a body flying over an uneven surface, are considered.</p></abstract><trans-abstract xml:lang="ru"><p>Обсуждается явление переходного излучения и аналогия между акустическим и оптическим эффектами. Приведены примеры. Рассчитано отражение одиночного широкополосного импульса акустического давления от тонкой сильно контрастной неоднородности. Проведен анализ процесса генерации акустического поля при резком торможении сферы, движущейся с дозвуковой скоростью. Обсуждается возможность излучения вихрем, образующимся при формировании акустического течения с учетом гидродинамической нелинейности. Рассмотрен процесс быстрого изгиба поверхности раздела несмешивающихся жидкостей, вызванный импульсом радиационной силы, а также излучение тела, летящего над неровной поверхностью.</p></trans-abstract><kwd-group xml:lang="en"><kwd>transition radiation</kwd><kwd>wave profiles</kwd><kwd>reflection from a layer</kwd><kwd>subsonic motion</kwd><kwd>compressed gas</kwd><kwd>interface</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>переходное излучение</kwd><kwd>профили волн</kwd><kwd>отражение от слоя</kwd><kwd>дозвуковое движение</kwd><kwd>сжатый газ</kwd><kwd>граница раздела</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 25-22-00106, https://rscf.ru/project/25-22-00106/</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Ginzburg V.L. 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