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An equivalent source method based on plane wave expansion and mirror imaging is proposed for predicting radiation from elastic structures in shallow water waveguide. This method uses the equivalent source framework and represents the Green’s function with plane wave expansion for virtual source intensities and far-field acoustic calculations. For seabed reflection coefficients dependent on incident angles, the Green’s function decomposes the spherical wave from a point source into plane waves, facilitating accurate reflection calculations on non-ideal boundaries. Comparisons with other Green’s function validate the computational accuracy. Numerical simulations of an elastic cylindrical shell under various excitation frequencies in shallow water waveguide confirm the method’s accuracy in sound field reconstruction.
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针对浅海波导中弹性结构辐射的预报问题,提出一种基于平面波展开镜像法的等效源方法,该方法以等效源法为主体框架,在求解虚拟源强度以及远场声场计算时采用平面波展开镜像法表示声场Green函数。对于海底反射系数是入射角函数的情况,文中Green函数在镜像法的基础上将点声源辐射球面波做各向平面波分解,实现球形波阵面在非理想平面边界上声反射的准确计算。通过不同方法表示的Green函数之间的对比,验证本文Green函数的计算精度。本文对浅海波导中弹性圆柱壳的数值仿真结果证明了基于平面波展开镜像法的等效源方法声场重构的准确性。
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2a.National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China
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2a.National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China
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2a.National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China
2b.College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
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2b.哈尔滨工程大学 水声工程学院,哈尔滨 150001
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等效源方法示意图, figureFileSmall=HEFUmpbPmg85wleN6JuLtw==, figureFileBig=+R4HUIlS6o4lZz3uwCQWfg==, tableContent=null), ArticleFig(id=1243306331529134274, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.2, caption=
Schematic diagram of mirror virtual source method, figureFileSmall=24GLUWZaqrVSJwkdjt/hhg==, figureFileBig=NBbW/fMec9/js2kUDQAktQ==, tableContent=null), ArticleFig(id=1243306331608826055, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图2, caption=
镜像虚源法示意图, figureFileSmall=24GLUWZaqrVSJwkdjt/hhg==, figureFileBig=NBbW/fMec9/js2kUDQAktQ==, tableContent=null), ArticleFig(id=1243306333122969803, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.3, caption=
Schematic diagram of spherical wave decomposed into plane waves, figureFileSmall=l5Bgmlf1GM6bOqX8YMGWig==, figureFileBig=iD+4qwwdRcZwB6AXdQ0E7g==, tableContent=null), ArticleFig(id=1243306333219438800, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图3, caption=
球面波分解为平面波示意图, figureFileSmall=l5Bgmlf1GM6bOqX8YMGWig==, figureFileBig=iD+4qwwdRcZwB6AXdQ0E7g==, tableContent=null), ArticleFig(id=1243306333307519188, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.4, caption=
Schematic diagram of point sound source model in shallow water channel, figureFileSmall=V+Kh0qkckfnyijf+pW31pg==, figureFileBig=vnJqDUZCvco4UAxHt7NEyw==, tableContent=null), ArticleFig(id=1243306333412376793, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图4, caption=
浅海信道点声源模型示意图, figureFileSmall=V+Kh0qkckfnyijf+pW31pg==, figureFileBig=vnJqDUZCvco4UAxHt7NEyw==, tableContent=null), ArticleFig(id=1243306333525623005, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.5, caption=
Relationship between seabed reflection coefficient and incident angle, figureFileSmall=f1AbLGyOrJlPU0hyq4Rv2g==, figureFileBig=ag0cwrdzHZdAyY+hX1dfPA==, tableContent=null), ArticleFig(id=1243306333630480607, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图5, caption=
海底反射系数与入射角之间的数值关系, figureFileSmall=f1AbLGyOrJlPU0hyq4Rv2g==, figureFileBig=ag0cwrdzHZdAyY+hX1dfPA==, tableContent=null), ArticleFig(id=1243306333743726819, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.6, caption=
Comparison of results obtained from two different methods, figureFileSmall=rYX/9xlzbTI3PF0LOko3qw==, figureFileBig=I6CEUjD/4nvomg/pbM+Mcw==, tableContent=null), ArticleFig(id=1243306333823418596, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图6, caption=
两种方法获得的声场结果对比, figureFileSmall=rYX/9xlzbTI3PF0LOko3qw==, figureFileBig=I6CEUjD/4nvomg/pbM+Mcw==, tableContent=null), ArticleFig(id=1243306333911498988, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.7, caption=
Comparison of SPL between the method proposed and the traditional mirror-image-method, figureFileSmall=76HzTTNad+ymKPTEFahKmA==, figureFileBig=ZLUCo1eM+Xeir7vE2JrR6Q==, tableContent=null), ArticleFig(id=1243306334003773679, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图7, caption=
本文方法与传统镜像法声场解对比, figureFileSmall=76HzTTNad+ymKPTEFahKmA==, figureFileBig=ZLUCo1eM+Xeir7vE2JrR6Q==, tableContent=null), ArticleFig(id=1243306334087659761, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.8, caption=
Schematic diagram of cylindrical shell model in shallow water channel, figureFileSmall=4X6HOnLwelHG82cyl1A2Yw==, figureFileBig=+PynX3qpIfnuvIzS47g33Q==, tableContent=null), ArticleFig(id=1243306334171545846, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图8, caption=
浅海波导圆柱壳模型示意图, figureFileSmall=4X6HOnLwelHG82cyl1A2Yw==, figureFileBig=+PynX3qpIfnuvIzS47g33Q==, tableContent=null), ArticleFig(id=1243306334251237625, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.9, caption=
Schematic diagram of sound pressure measurement points and virtual source distribution on cylindrical shell model, figureFileSmall=truUWYdiJkS5JtySPuF8eA==, figureFileBig=iL+atM4sXuSKhm46v0Id9w==, tableContent=null), ArticleFig(id=1243306334343512317, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图9, caption=
浅海波导圆柱壳模型上的声压测点及虚拟源分布示意图, figureFileSmall=truUWYdiJkS5JtySPuF8eA==, figureFileBig=iL+atM4sXuSKhm46v0Id9w==, tableContent=null), ArticleFig(id=1243306334414815487, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.10, caption=
Schematic diagram of sound field comparison area, figureFileSmall=Sq02Y1hbTkA7jVl0Xmzzxw==, figureFileBig=KsmS7HlKuenXWTgZuJo/Uw==, tableContent=null), ArticleFig(id=1243306334507090178, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图10, caption=
声场比较区域示意图, figureFileSmall=Sq02Y1hbTkA7jVl0Xmzzxw==, figureFileBig=KsmS7HlKuenXWTgZuJo/Uw==, tableContent=null), ArticleFig(id=1243306334611947782, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.11, caption=
Comparison of sound pressure level on horizontal path L1, figureFileSmall=AF4hPR8/M8K0pDzT++q+iA==, figureFileBig=AGkwjm2wYySYkGZvPRkbtQ==, tableContent=null), ArticleFig(id=1243306334687445257, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图11, caption=
水平路径声压级比较, figureFileSmall=AF4hPR8/M8K0pDzT++q+iA==, figureFileBig=AGkwjm2wYySYkGZvPRkbtQ==, tableContent=null), ArticleFig(id=1243306334779719951, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Fig.12, caption=
Comparison of sound pressure level on α1 and β1 sections, figureFileSmall=eI7Vl02zWzRedkMH51Yvgg==, figureFileBig=FhqKTMQVXUTDMZRs3RVeiA==, tableContent=null), ArticleFig(id=1243306334863606037, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=图12, caption=
截面声压级比较, figureFileSmall=eI7Vl02zWzRedkMH51Yvgg==, figureFileBig=FhqKTMQVXUTDMZRs3RVeiA==, tableContent=null), ArticleFig(id=1243306334947492122, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=EN, label=Tab.1, caption=
Summary of calculation errors for the proposed method
, figureFileSmall=null, figureFileBig=null, tableContent=
| 激励力频率 | 虚拟源数目 | 传递矩阵条件数 | l1上平均预报误差 | α1上及β1上平均预报误差 |
|---|
| 50 Hz | 120 | 4.26E+07 | 8.61% | 9.65% |
| 100 Hz | 209 | 7.58E+06 | 5.96% | 7.01% |
| 300 Hz | 619 | 1.87E+08 | 7.48% | 8.45% |
), ArticleFig(id=1243306335039766812, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1243306313460073224, language=CN, label=表1, caption=
本文方法的计算误差汇总
, figureFileSmall=null, figureFileBig=null, tableContent=
| 激励力频率 | 虚拟源数目 | 传递矩阵条件数 | l1上平均预报误差 | α1上及β1上平均预报误差 |
|---|
| 50 Hz | 120 | 4.26E+07 | 8.61% | 9.65% |
| 100 Hz | 209 | 7.58E+06 | 5.96% | 7.01% |
| 300 Hz | 619 | 1.87E+08 | 7.48% | 8.45% |
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