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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->哈尔滨工程大学]]></title>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Progress in internal wave theory for two-layer and three-layer fluid systems]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202304012]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Internal waves, occurring in stratified ocean, are ubiquitous in the world oceans. It is of great significance for our country′s marine development to study the generation and evolution of internal waves. Based on the internal wave theory of two-layer and three-layer fluid systems, the KdV(Korteweg-de Vries) internal wave theory, MCC(Miyata-Choi-Camassa) internal wave theory, HLGN(high-level Green-Naghdi) internal wave theory and Dubreil-Jacotin-Long internal wave theory, which were widely used at home and abroad, were selected to review their research progress. The advantages and limitations of different internal wave theories were discussed from mathematical models, theoretical research and numerical simulations. In the view of mathematical derivation, it is proved that MCC internal wave theory is equivalent to the first-level HLGN internal wave theory.]]></description>
<pubDate>2023/7/20 0:00:00</pubDate>
<category><![CDATA[哈尔滨工程大学]]></category>
<author><![CDATA[ZHAO Binbin, ZHANG Tianyu, DU Hui, DUAN Wenyang, WANG Zhan]]></author>
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<atom:name>ZHAO Binbin, ZHANG Tianyu, DU Hui, DUAN Wenyang, WANG Zhan</atom:name>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Jacobi-Ritz time domain semi-analytic method and characteristic analysis of cylindrical shell vibro-acoustic radiation]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202304013]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Considering the deficiency in the research on transient vibro-acoustic characteristics of cylindrical shell structures, a Jacobi-Ritz semi-analytic method for forced vibration sound radiation of cylindrical shells in time domain was proposed by combining Newmark-β integral method and Kirchhoff boundary element integral equation in time domain. Based on the theory of first-order shear deformation and the idea of element method, a calculation and analysis model of vibration acoustic radiation of cylindrical shell was established. Jacobi polynomial and Fourier series were used to represent the allowable functions of axial and circumferential displacement. The time domain response of forced vibration of cylindrical shell was calculated on the basis of the Rayleigh-Ritz method and Newmark-β integral method. Based on Kirchhoff integral equation, the time domain response of radiated noise was solved, and the acoustic radiation characteristics of forced vibration of cylindrical shell were analyzed. Compared with finite element method/boundary element method numerical results, the proposed method has the characteristics of good convergence and high precision. The peak value of acoustic response of cylindrical structures shifts to the left with the weakening of the boundary condition stiffness, and the vibration acoustic response decreases with the increase of the thickness. When the peak frequency of random load is close to the natural frequency of the structure, strong characteristic line spectrum appears in the acoustic response of the structure.]]></description>
<pubDate>2023/7/20 16:28:59</pubDate>
<category><![CDATA[哈尔滨工程大学]]></category>
<author><![CDATA[PANG Fuzhen, ZHENG Jiajun, GAO Cong, LI Haichao, ZHANG Ming]]></author>
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<atom:name>PANG Fuzhen, ZHENG Jiajun, GAO Cong, LI Haichao, ZHANG Ming</atom:name>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Modified criteria for jet direction of bubbles above a rigid boundary]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202304014]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The Blake criterion, which determines the bubble jet direction above a rigid boundary, was obtained through the Kelvin impulse theory. However, the theoretical model has lower prediction accuracy under a specific parameter range. Therefore, a modified judgment criterion for the bubble jet direction was proposed by considering pressure variation inside the bubble and introducing the boundary effect. The boundary element method was used to simulate the results and verify them. Meanwhile, the prediction results of the modified model and the traditional Blake criterion were compared, and the influence of dimensionless strength parameters on the prediction results of the modified model was investigated. Results show that the modified model has higher prediction accuracy than the traditional Blake criterion. The modified theoretical model provides a valuable reference for underwater explosion, seabed geophysical exploration, and related fields.]]></description>
<pubDate>2023/7/20 0:00:00</pubDate>
<category><![CDATA[哈尔滨工程大学]]></category>
<author><![CDATA[CHEN Qihang, ZHANG Aman, LI Shuai]]></author>
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<atom:name>CHEN Qihang, ZHANG Aman, LI Shuai</atom:name>
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