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Experiments were conducted in a laboratory tank, employing synchronized high-speed imaging and hydrophone measurements to characterize the cavity closure modes and their resultant acoustic signatures across a range of Froude numbers. The acoustic signal features a weak radiated signal upon impact, followed by significant pressure oscillations spanning more than 20 cycles in the flow field after cavity elongation and pinch-off. A numerical model based on the Finite Volume Method successfully captures these physical processes. Subsequently, a semi-theoretical model that incorporates the projectile's boundary effect is developed from potential flow theory. The model not only yields a dominant cavity oscillation frequency that agrees well with experimental data, but also reveals that the boundary effect leads to a cavity oscillation frequency markedly higher than the Minnaert frequency of an equivalent-volume ellipsoidal bubble containing an internal rigid core. The dominant cavity frequency falls nearly linearly with Fr, governed by nose geometry and projectile inertia. This study clarifies the underlying physics connecting cavity dynamics during water entry to underwater acoustic radiation.<\/jats:p>","DOI":"10.1121\/10.0042981","type":"journal-article","created":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T13:21:54Z","timestamp":1773148914000},"page":"2061-2073","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":2,"title":["Acoustic signatures of pinch-off cavities during water-entry"],"prefix":"10.1121","volume":"159","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-7471-1052","authenticated-orcid":false,"given":"Zirui","family":"Liu","sequence":"first","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]},{"name":"Nanhai Institute of Harbin Engineering University 2 , Sanya 572024,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tongtong","family":"Ding","sequence":"additional","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingyue","family":"Kuang","sequence":"additional","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zimeng","family":"Li","sequence":"additional","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junyi","family":"Zhao","sequence":"additional","affiliation":[{"name":"Southampton Ocean Engineering Joint Institute, Harbin Engineering University 3 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1299-3049","authenticated-orcid":false,"given":"A-Man","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]},{"name":"Nanhai Institute of Harbin Engineering University 2 , Sanya 572024,","place":["China"]},{"name":"Southampton Ocean Engineering Joint Institute, Harbin Engineering University 3 , Harbin 150001,","place":["China"]},{"name":"National Key Lab of Ship Structural Safety, Harbin Engineering University 4 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3043-5617","authenticated-orcid":false,"given":"Shuai","family":"Li","sequence":"additional","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]},{"name":"Nanhai Institute of Harbin Engineering University 2 , Sanya 572024,","place":["China"]},{"name":"Southampton Ocean Engineering Joint Institute, Harbin Engineering University 3 , Harbin 150001,","place":["China"]},{"name":"National Key Lab of Ship Structural Safety, Harbin Engineering University 4 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2026,3,10]]},"reference":[{"issue":"1","key":"2026031009214681800_c1","doi-asserted-by":"publisher","first-page":"129","DOI":"10.1017\/S0022112070001738","article-title":"Pressure measurements in the water-entry cavity","volume":"44","year":"1970","journal-title":"J. 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