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Based on the discrete module methodology, this paper proposes a numerical method to estimate the mean drift forces on flexible floating bodies. The continuous structure was first discretized into rigid modules connected by elastic beams. The first-order hydroelastic responses were solved by coupling the hydrodynamics on modules and the structural stiffness of elastic beams in the frequency domain. Based on the first-order motions of the modules, the second-order mean drift forces on each rigid module were calculated by second-order multi-body hydrodynamic theory. The motions and mean drift forces of a freely floating flexible barge using the proposed method were verified against the results obtained by the 3D hydroelastic theory based on modal superposition. Moreover, due to the discrete property of the present method for hydrodynamics, the method can be directly extended to inhomogeneous wave conditions.
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本文基于离散模块思想,提出一种求解弹性浮体二阶平均漂移力的数值方法。首先将连续弹性浮体离散为弹性梁连接的刚性模块系统,实现弹性梁刚度和各模块水动力信息的耦合,在频域内求解浮体一阶水弹性响应。然后利用二阶多体水动力理论,并考虑计及结构弹性变形影响后的各模块一阶运动信息,获得各刚性模块上的二阶平均漂移力。最后,利用该方法求解自由柔性驳船的平均漂移力,并与基于模态叠加思想的三维水弹性理论的计算结果进行对比验证。此外,由于本文方法在水动力求解方面的离散特性,该方法可直接拓展到非均匀波浪场下浮体的水弹性响应分析。
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Flow diagram of the numerical simulation, figureFileSmall=VR3ln3LummmOgzqhp8Q8vA==, figureFileBig=Mv3Hy6SsxB0tDs9JseL4jg==, tableContent=null), ArticleFig(id=1242150823925461980, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=图1, caption=
数值模拟流程图, figureFileSmall=VR3ln3LummmOgzqhp8Q8vA==, figureFileBig=Mv3Hy6SsxB0tDs9JseL4jg==, tableContent=null), ArticleFig(id=1242150824122594284, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Fig.2, caption=
Coordinate systems of a multi-body system, figureFileSmall=RMNsaGMrzDu5vhhh6yH/bA==, figureFileBig=zFvlEFtHrOMbDVJFJyLwFg==, tableContent=null), ArticleFig(id=1242150824277783540, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=图2, caption=
多体系统的坐标系定义, figureFileSmall=RMNsaGMrzDu5vhhh6yH/bA==, figureFileBig=zFvlEFtHrOMbDVJFJyLwFg==, tableContent=null), ArticleFig(id=1242150824361669630, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Fig.3, caption=
Schematic diagram of the numerical model and the equivalent beam, figureFileSmall=w5JBBiMNeTDZHhsSBJHcwg==, figureFileBig=OpOH+HvpDbJ2+snHA9tH9w==, tableContent=null), ArticleFig(id=1242150824453943298, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=图3, caption=
数值模型和等效梁的示意图, figureFileSmall=w5JBBiMNeTDZHhsSBJHcwg==, figureFileBig=OpOH+HvpDbJ2+snHA9tH9w==, tableContent=null), ArticleFig(id=1242150824525246474, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Fig.4, caption=
Hydrodynamic meshes of the numerical model, figureFileSmall=Bz1YXX64OAA97/CUIJ2Z1g==, figureFileBig=bvZL6vpXrILwvLYDXC1Gig==, tableContent=null), ArticleFig(id=1242150824609132558, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=图4, caption=
数值模型的水动力网格, figureFileSmall=Bz1YXX64OAA97/CUIJ2Z1g==, figureFileBig=bvZL6vpXrILwvLYDXC1Gig==, tableContent=null), ArticleFig(id=1242150824726573075, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Fig.5, caption=
Comparison of the vertical and horizontal displacements of the floating body under different wave angles between the 3D hydroelasticity theory and the present method, figureFileSmall=7JjNjMMQLO2miLfVXyKEXw==, figureFileBig=7j+N/vlgxJPAh13zVIHSug==, tableContent=null), ArticleFig(id=1242150824823042072, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=图5, caption=
两种数值方法求解的不同浪向下浮体的垂直和水平位移对比, figureFileSmall=7JjNjMMQLO2miLfVXyKEXw==, figureFileBig=7j+N/vlgxJPAh13zVIHSug==, tableContent=null), ArticleFig(id=1242150824919511068, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Fig.6, caption=
Comparison of the principal coordinate responses of the modes for vertical motions under different wave angles between the 3D hydroelasticity theory and the present method, figureFileSmall=0J0xJo14fVW3W9Osp5yJ8Q==, figureFileBig=CU+hhmxoP71CsI0Arb6gRg==, tableContent=null), ArticleFig(id=1242150825053728798, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=图6, caption=
两种数值方法求解的不同浪向下浮体垂向运动相关模态的主坐标响应, figureFileSmall=0J0xJo14fVW3W9Osp5yJ8Q==, figureFileBig=CU+hhmxoP71CsI0Arb6gRg==, tableContent=null), ArticleFig(id=1242150825150197795, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Fig.7, caption=
Comparison of the principal coordinate responses of the modes for both horizontal and roll motions under different wave angles between the 3D hydroelasticity theory and the present method, figureFileSmall=IRzmyo5x9FsCREuASztbaQ==, figureFileBig=U3yKZ9WucfjuWmyn7AeDXg==, tableContent=null), ArticleFig(id=1242150825242472488, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=图7, caption=
两种数值方法求解的不同浪向下浮体水平和横摇运动相关模态的主坐标响应, figureFileSmall=IRzmyo5x9FsCREuASztbaQ==, figureFileBig=U3yKZ9WucfjuWmyn7AeDXg==, tableContent=null), ArticleFig(id=1242150825330552877, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Fig.8, caption=
Comparison of the second-order wave drift forces under different wave angles between the 3D hydroelasticity theory and the present method, figureFileSmall=oWnbLlfb4k9wNFbNNtAfqQ==, figureFileBig=lYwPvq/MYT6yI3I7F3L9oA==, tableContent=null), ArticleFig(id=1242150825422827568, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=图8, caption=
两种数值方法求解的不同浪向下浮体的二阶平均漂移力对比, figureFileSmall=oWnbLlfb4k9wNFbNNtAfqQ==, figureFileBig=lYwPvq/MYT6yI3I7F3L9oA==, tableContent=null), ArticleFig(id=1242150825515102260, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Fig.9, caption=
Effect of the rigid body motion and flexible deformation on the second-order wave drift force under different wave angles, figureFileSmall=n1MAI4kDLqhvzEovkg6QPg==, figureFileBig=NgiOJF+my7EfHX03R2yp4g==, tableContent=null), ArticleFig(id=1242150825640931385, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=图9, caption=
不同浪向下刚体运动和弹性变形对二阶平均漂移力的影响分析, figureFileSmall=n1MAI4kDLqhvzEovkg6QPg==, figureFileBig=NgiOJF+my7EfHX03R2yp4g==, tableContent=null), ArticleFig(id=1242150825762566208, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Fig.10, caption=
Comparison of the second-order wave drift forces on different modules under different wave angles, figureFileSmall=3rHwow7Ey19mKbqt6xMFbg==, figureFileBig=WCd5n9geUKARvjTf8t1GmQ==, tableContent=null), ArticleFig(id=1242150827264127043, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=图10, caption=
不同浪向下模块的二阶平均漂移力对比, figureFileSmall=3rHwow7Ey19mKbqt6xMFbg==, figureFileBig=WCd5n9geUKARvjTf8t1GmQ==, tableContent=null), ArticleFig(id=1242150827377373256, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Tab.1, caption=
Main parameters of the numerical model
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| 名称 | 数值 | 名称 | 数值 |
|---|
| 总长L/m | 200 | 排水量M/kg | 1.64E7 |
| 单刚性模块长度lm/m | 25 | 垂向弯曲刚度EIy/(N・m2) | 1.68E11 |
| 型宽B/m | 16 | 水平弯曲刚度EIz/(N・m2) | 8.40E11 |
| 型深D/m | 10 | 扭转刚度GJx/(N・m2) | 1.94E11 |
| 吃水d/m | 5 | 水深H/m | 500 |
| 重心距基线垂向距离KG/m | 5 | | |
), ArticleFig(id=1242150827461259340, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=表1, caption=
数值模型的主要参数
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| 名称 | 数值 | 名称 | 数值 |
|---|
| 总长L/m | 200 | 排水量M/kg | 1.64E7 |
| 单刚性模块长度lm/m | 25 | 垂向弯曲刚度EIy/(N・m2) | 1.68E11 |
| 型宽B/m | 16 | 水平弯曲刚度EIz/(N・m2) | 8.40E11 |
| 型深D/m | 10 | 扭转刚度GJx/(N・m2) | 1.94E11 |
| 吃水d/m | 5 | 水深H/m | 500 |
| 重心距基线垂向距离KG/m | 5 | | |
), ArticleFig(id=1242150827561922637, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=EN, label=Tab.2, caption=
Natural frequencies of the numerical model in dry and wet conditions for the first 14 modes
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| 模态序号 | 干模态对应的固有频率/Hz | 湿模态对应的固有频率/Hz | 模态形状 |
|---|
| 1 | 0 | 0 | 纵荡 |
| 2 | 0 | 0 | 横荡 |
| 3 | 0 | 0 | 首摇 |
| 4 | 0 | 0.102 | 横摇 |
| 5 | 0 | 0.151 | 纵摇 |
| 6 | 0 | 0.152 | 垂荡 |
| 7 | 0.127 | 0.176 | 两节点垂向弯曲 |
| 8 | 0.285 | 0.276 | 两节点水平弯曲 |
| 9 | 0.351 | 0.276 | 三节点垂向弯曲 |
| 10 | 0.689 | 0.470 | 四节点垂向弯曲 |
| 11 | 0.706 | 0.606 | 一节点扭转 |
| 12 | 0.785 | 0.716 | 三节点水平弯曲 |
| 13 | 1.138 | 0.748 | 五节点垂向弯曲 |
| 14 | 1.412 | 1.099 | 两节点扭转 |
), ArticleFig(id=1242150827670974546, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242150810713403909, language=CN, label=表2, caption=
数值模型前14阶干模态和湿模态对应的固有频率
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| 模态序号 | 干模态对应的固有频率/Hz | 湿模态对应的固有频率/Hz | 模态形状 |
|---|
| 1 | 0 | 0 | 纵荡 |
| 2 | 0 | 0 | 横荡 |
| 3 | 0 | 0 | 首摇 |
| 4 | 0 | 0.102 | 横摇 |
| 5 | 0 | 0.151 | 纵摇 |
| 6 | 0 | 0.152 | 垂荡 |
| 7 | 0.127 | 0.176 | 两节点垂向弯曲 |
| 8 | 0.285 | 0.276 | 两节点水平弯曲 |
| 9 | 0.351 | 0.276 | 三节点垂向弯曲 |
| 10 | 0.689 | 0.470 | 四节点垂向弯曲 |
| 11 | 0.706 | 0.606 | 一节点扭转 |
| 12 | 0.785 | 0.716 | 三节点水平弯曲 |
| 13 | 1.138 | 0.748 | 五节点垂向弯曲 |
| 14 | 1.412 | 1.099 | 两节点扭转 |
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