Article(id=1281202567929639765, tenantId=1146029695717560320, journalId=1240685776644648972, issueId=1281202552578478607, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1007-7294.2026.05.014, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1772726400000, receivedDateStr=2026-03-06, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1783392095786, onlineDateStr=2026-07-07, pubDate=1778774400000, pubDateStr=2026-05-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1783392095786, onlineIssueDateStr=2026-07-07, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1783392095786, creator=13041195026, updateTime=1783392095786, updator=13041195026, issue=Issue{id=1281202552578478607, tenantId=1146029695717560320, journalId=1240685776644648972, year='2026', volume='30', issue='5', pageStart='659', pageEnd='842', issueExtLink='null', onlineDate='null', pubDate='1778774400000', pubDateStr='2026-05-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1783392092127, creator='13041195026', updateTime=1783395243852, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1281215774769525418, tenantId=1146029695717560320, journalId=1240685776644648972, issueId=1281202552578478607, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1281215775176372907, tenantId=1146029695717560320, journalId=1240685776644648972, issueId=1281202552578478607, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=825, endPage=842, ext={EN=ArticleExt(id=1281202571998114646, articleId=1281202567929639765, tenantId=1146029695717560320, journalId=1240685776644648972, language=EN, title=Acoustic scattering characteristics of ribbed cylindrical shells with multilayer gradient acoustic coating, columnId=1241023038381158513, journalTitle=Journal of Ship Mechanics, columnName=Hydro/Structural Acoustics, runingTitle=null, highlight=null, articleAbstract=
Applying an acoustic coating to the hull effectively reduces target strength while reducing both mechanical and hydrodynamic noise. In this study, a finite ribbed cylindrical shell is studied based on the modal superposition method. A computational model is developed to predict the acoustic scattering of a finite ribbed cylindrical shell with multilayer gradient acoustic coating in an infinite ideal fluid. The influence of characteristic impedance parameters—such as sound speed and density—on the scattering form function is examined, and an optimized impedance distribution for the multilayer gradient acoustic coating is proposed to suppress scattering across different frequency bands. In addition, the effects of frequency-dependent characteristic impedance of embedded-cavity acoustic coatings and stiffeners of cylindrical shells on the scattering form function are investigated. Results show that multilayer gradient acoustic coating with characteristic impedance gradually increasing from the inner to the outer surface can effectively reduce the scattering form function in lower frequency ranges. Furthermore, frequency-dependent acoustic coatings result in broadband scattering control from low to high frequencies, and applying an optimized layered coating to the rib-stiffened cylindrical shell yields a substantial reduction in its scattering form function for frequencies above 500 Hz.
, authors=Bai-xi YU
1, 2, Yi-peng CHENG
3, Can SIMA
1, 2, Zhen-guo BAI
1, 2, authorsList=Bai-xi YU, Yi-peng CHENG, Can SIMA, Zhen-guo BAI, authorCompany=null, correspAuthors=Bai-xi YU, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright ©2026 Journal of Ship Mechanics. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1281202961208553695, articleId=1281202567929639765, tenantId=1146029695717560320, journalId=1240685776644648972, language=CN, title=敷设分层梯度覆盖层的有限长加肋圆柱壳声散射特性, columnId=1241023038515376243, journalTitle=船舶力学, columnName=流体与结构声学, runingTitle=null, highlight=null, articleAbstract=
在潜艇壳体表面敷设声学覆盖层,可有效降低声目标强度,并可兼顾对机械噪声和水动力噪声的多重控制。本文以有限长加肋圆柱壳为研究对象,基于模态叠加法,建立了自由场环境中敷设分层梯度声学覆盖层有限长加肋圆柱壳的声散射计算模型,分析了覆盖层的声速、密度等特征声阻抗参数对圆柱壳声散射形态函数的影响规律,提出了一种分层梯度覆盖层的特征声阻抗分布来有效降低不同频段散射形态函数的方法。同时,研究了具有频率相关特征声阻抗的内置空腔覆盖层和加肋圆柱壳对散射形态函数的影响特征。研究结果表明:采用从内层到外层声阻抗逐渐递增的分层梯度覆盖层可在更低频段有效降低散射形态函数,特征声阻抗与频率相关的分层梯度覆盖层可以兼顾从低频到高频的声散射控制,敷设参数经过优化的分层覆盖层可以使加肋圆柱壳声散射形态函数在500 Hz以上频段明显降低。
, authors=俞白兮
1, 2, 程一鹏
3, 司马灿
1, 2, 白振国
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12(4): 543., articleTitle=Investigation on low-frequency and broadband sound absorption of the compact anechoic coating considering hydrostatic pressure, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1281202964136177890, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, xref=1., ext=[AuthorCompanyExt(id=1281202964157149411, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, companyId=1281202964136177890, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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3.西北工业大学 航海学院,西安 710072)])], figs=[ArticleFig(id=1281202986793808141, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.1, caption=
Schematic diagram of a finite stiffened cylindrical shell covered with multilayer gradient acoustic coatings, figureFileSmall=0lSK7S1s7WAuh3zBFSgTcA==, figureFileBig=zYOTNvcrO2WE1bAffjFxeA==, tableContent=null), ArticleFig(id=1281202987305513230, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图1, caption=
敷设分层梯度覆盖层的有限长加肋圆柱壳模型示意图, figureFileSmall=0lSK7S1s7WAuh3zBFSgTcA==, figureFileBig=zYOTNvcrO2WE1bAffjFxeA==, tableContent=null), ArticleFig(id=1281202990979723535, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.2, caption=
Schematic diagram of a cylindrical shell subjected to an obliquely incident plane wave, figureFileSmall=qi9gFm5b/9mSgt+7PhUwiA==, figureFileBig=5Q+kcwcHNEBLeXE0D0a9nQ==, tableContent=null), ArticleFig(id=1281202991772446992, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图2, caption=
圆柱壳受斜入射平面波作用示意图, figureFileSmall=qi9gFm5b/9mSgt+7PhUwiA==, figureFileBig=5Q+kcwcHNEBLeXE0D0a9nQ==, tableContent=null), ArticleFig(id=1281202992288346385, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.3, caption=
Acoustic scattering model of finite cylindrical shell (COMSOL), figureFileSmall=wBkhr8XfBore787a4XuWJg==, figureFileBig=uZsXElHqxk6/93BeopSkmA==, tableContent=null), ArticleFig(id=1281202993030738194, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图3, caption=
有限长圆柱壳声散射COMSOL模型, figureFileSmall=wBkhr8XfBore787a4XuWJg==, figureFileBig=uZsXElHqxk6/93BeopSkmA==, tableContent=null), ArticleFig(id=1281202993462751507, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.4, caption=
Comparison of scattering form function of the cylindrical shell validation model, figureFileSmall=SySWAGRoCN3IjkaqxcchdQ==, figureFileBig=qUvIr+KFKexaKe+zBfGnwQ==, tableContent=null), ArticleFig(id=1281202995337605397, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图4, caption=
圆柱壳验证模型散射形态函数计算结果比较, figureFileSmall=SySWAGRoCN3IjkaqxcchdQ==, figureFileBig=qUvIr+KFKexaKe+zBfGnwQ==, tableContent=null), ArticleFig(id=1281202995698315543, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.5, caption=
Effect of water layer on the total scattering form function of the cylindrical shell, figureFileSmall=KwUEdQZqQNCWbGlzQ9q78A==, figureFileBig=J0Dmm3p6IioSrcCPHQFl3Q==, tableContent=null), ArticleFig(id=1281202996386181400, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图5, caption=
水层对圆柱壳总散射形态函数的影响, figureFileSmall=KwUEdQZqQNCWbGlzQ9q78A==, figureFileBig=J0Dmm3p6IioSrcCPHQFl3Q==, tableContent=null), ArticleFig(id=1281202996910469401, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.6, caption=
Comparison of shell surface root mean square (RMS) velocity results, figureFileSmall=d2HyYEVTYkQmNO9Ua8SmZw==, figureFileBig=Yt+mzISd39VHKVQ3tRgFEA==, tableContent=null), ArticleFig(id=1281202997657055514, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图6, caption=
表面均方振速结果比较, figureFileSmall=d2HyYEVTYkQmNO9Ua8SmZw==, figureFileBig=Yt+mzISd39VHKVQ3tRgFEA==, tableContent=null), ArticleFig(id=1281202998097457435, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.7, caption=
Scattering form functions at different azimuth angles, figureFileSmall=TJSUB63S7leLZQxPlxxxig==, figureFileBig=NNNVPg7qqF/mj0NzlV1P5Q==, tableContent=null), ArticleFig(id=1281203000161055004, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图7, caption=
不同方位角下的散射形态函数, figureFileSmall=TJSUB63S7leLZQxPlxxxig==, figureFileBig=NNNVPg7qqF/mj0NzlV1P5Q==, tableContent=null), ArticleFig(id=1281203000651788573, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.8, caption=
Influence of acoustic parameters of uniform acoustic coatings on the scattering form functions of the cylindrical shell, figureFileSmall=6p+ANjJ8sHqa5Sp/oNgdkw==, figureFileBig=BYDizR53Y0nm/Qib9lkVew==, tableContent=null), ArticleFig(id=1281203001440317726, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图8, caption=
均匀声学覆盖层声学参数对圆柱壳散射形态函数的影响, figureFileSmall=6p+ANjJ8sHqa5Sp/oNgdkw==, figureFileBig=BYDizR53Y0nm/Qib9lkVew==, tableContent=null), ArticleFig(id=1281203002283372831, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.9, caption=
Typical modal displacement amplitude on the outer surface of uniform and multilayer gradient acoustic coatings, figureFileSmall=lDPMdDjCU/zh2XxaNj869A==, figureFileBig=P+VtWzbeinUERZuJpTwpHA==, tableContent=null), ArticleFig(id=1281203002803466528, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图9, caption=
均匀与分层梯度覆盖层外表面的典型模态位移幅值, figureFileSmall=lDPMdDjCU/zh2XxaNj869A==, figureFileBig=P+VtWzbeinUERZuJpTwpHA==, tableContent=null), ArticleFig(id=1281203004468605217, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.10, caption=
Effect of multilayer gradient acoustic coatings on the total scattering form functions of the cylindrical shell, figureFileSmall=PISLof2QqiYusYEfs9EXGw==, figureFileBig=Hw6oDCfuBV2NJpjRVLRFdQ==, tableContent=null), ArticleFig(id=1281203005194219810, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图10, caption=
分层梯度覆盖层对圆柱壳总散射形态函数的影响, figureFileSmall=PISLof2QqiYusYEfs9EXGw==, figureFileBig=Hw6oDCfuBV2NJpjRVLRFdQ==, tableContent=null), ArticleFig(id=1281203005831754019, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.11, caption=
Schematic diagram of a viscoelastic coating layer with embedded cavities, figureFileSmall=79tonpozJQiR/BsREah66w==, figureFileBig=IraPUfA2wbp/c8cG3crDdw==, tableContent=null), ArticleFig(id=1281203006200852772, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图11, caption=
埋置空腔的粘弹性覆盖层示意图, figureFileSmall=79tonpozJQiR/BsREah66w==, figureFileBig=IraPUfA2wbp/c8cG3crDdw==, tableContent=null), ArticleFig(id=1281203006955827493, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.12, caption=
Schematic diagram of acoustic parameters of uniform acoustic coatings varying with frequency, figureFileSmall=fOyR19uuDLGkFi+u5vOaHw==, figureFileBig=AZJ0r9Tl4BmK2fiIbm/TGA==, tableContent=null), ArticleFig(id=1281203008985870630, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图12, caption=
均匀覆盖层声学参数随频率变化示意图, figureFileSmall=fOyR19uuDLGkFi+u5vOaHw==, figureFileBig=AZJ0r9Tl4BmK2fiIbm/TGA==, tableContent=null), ArticleFig(id=1281203009942171943, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.13, caption=
Frequency-dependent total scattering form functions of the acoustic coatings, figureFileSmall=h5zGWTXQGrbY4Ly1UrJrdg==, figureFileBig=u2qrV10TuDuoyQdxmVQKoQ==, tableContent=null), ArticleFig(id=1281203010399351080, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图13, caption=
频率相关覆盖层总散射形态函数, figureFileSmall=h5zGWTXQGrbY4Ly1UrJrdg==, figureFileBig=u2qrV10TuDuoyQdxmVQKoQ==, tableContent=null), ArticleFig(id=1281203011091411241, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.14, caption=
Total scattering form functions of stiffened cylindrical shell under normal incidence of plane wave, figureFileSmall=6KizJ9W2ZTsZN7IgweMbOQ==, figureFileBig=i11IE5JN13z/9Vy39Zwtbw==, tableContent=null), ArticleFig(id=1281203011540201770, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图14, caption=
平面波垂直入射时加肋圆柱壳总散射形态函数, figureFileSmall=6KizJ9W2ZTsZN7IgweMbOQ==, figureFileBig=i11IE5JN13z/9Vy39Zwtbw==, tableContent=null), ArticleFig(id=1281203013616382251, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Fig.15, caption=
Scattering form functions of stiffened cylindrical shell with frequency-dependent acoustic coatings, figureFileSmall=eO0x/3kAOzaRKthgVjafBA==, figureFileBig=L8Ws0+qbyCV8vZCbT1cfTw==, tableContent=null), ArticleFig(id=1281203014459437356, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=图15, caption=
敷设频率相关覆盖层的加肋有限长圆柱壳形态函数, figureFileSmall=eO0x/3kAOzaRKthgVjafBA==, figureFileBig=L8Ws0+qbyCV8vZCbT1cfTw==, tableContent=null), ArticleFig(id=1281203015336046893, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Tab.1, caption=
Parameters of the cylindrical shell validation model
, figureFileSmall=null, figureFileBig=null, tableContent=
| 圆柱壳长度 /m | 圆柱壳半径 /m | 壳板厚度 /mm | 弹性模量 /GPa | 泊松比 | 密度 /(kg·m−3) | 远场距离 /m |
|---|
| 9.6 | 3.5 | 28 | 210 | 0.3 | 7800 | 200 |
), ArticleFig(id=1281203016137158958, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=表1, caption=
圆柱壳验证模型基本参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 圆柱壳长度 /m | 圆柱壳半径 /m | 壳板厚度 /mm | 弹性模量 /GPa | 泊松比 | 密度 /(kg·m−3) | 远场距离 /m |
|---|
| 9.6 | 3.5 | 28 | 210 | 0.3 | 7800 | 200 |
), ArticleFig(id=1281203018234310959, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Tab.2, caption=
Calculation parameters of the uniform acoustic coating
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 归一化特征声阻抗 | 归一化声速和密度 | | 工况 | 归一化特征声阻抗 | 归一化声速和密度 |
|---|
| Case 1.1 | $ \alpha \text{=0.6} $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{=}0.77,{\alpha }_{\rho }\text{=}\sqrt{\alpha }\text{=}0.77 $ | | Case 2.1 | $ \alpha \text{=0.8} $ | $ {\alpha }_{{\mathrm{c}}}\text{=0.5},{\alpha }_{\rho }\text{=1.6} $ |
| Case 1.2 | $ \alpha \text{=0.8} $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{=}0.89,{\alpha }_{\rho }\text{=}\sqrt{\alpha }\text{=}0.89 $ | | Case 2.2 | $ {\alpha }_{{\mathrm{c}}}\text{=}1,{\alpha }_{\rho }\text{=0.8} $ |
| Case 1.3 | $ \alpha \text{=}1.0 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{=}1,{\alpha }_{\rho }\text{=}\sqrt{\alpha }\text{=1} $ | | Case 2.3 | $ {\alpha }_{{\mathrm{c}}}\text{=}1.6,{\alpha }_{\rho }\text{=0.5} $ |
| Case 1.4 | $ \alpha \text{=}1.2 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{=1.09},{\alpha }_{\rho }\text{=}\sqrt{\alpha }\text{=}1.09 $ | | | | |
), ArticleFig(id=1281203019031228720, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=表2, caption=
均匀声学覆盖层计算参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 归一化特征声阻抗 | 归一化声速和密度 | | 工况 | 归一化特征声阻抗 | 归一化声速和密度 |
|---|
| Case 1.1 | $ \alpha \text{=0.6} $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{=}0.77,{\alpha }_{\rho }\text{=}\sqrt{\alpha }\text{=}0.77 $ | | Case 2.1 | $ \alpha \text{=0.8} $ | $ {\alpha }_{{\mathrm{c}}}\text{=0.5},{\alpha }_{\rho }\text{=1.6} $ |
| Case 1.2 | $ \alpha \text{=0.8} $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{=}0.89,{\alpha }_{\rho }\text{=}\sqrt{\alpha }\text{=}0.89 $ | | Case 2.2 | $ {\alpha }_{{\mathrm{c}}}\text{=}1,{\alpha }_{\rho }\text{=0.8} $ |
| Case 1.3 | $ \alpha \text{=}1.0 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{=}1,{\alpha }_{\rho }\text{=}\sqrt{\alpha }\text{=1} $ | | Case 2.3 | $ {\alpha }_{{\mathrm{c}}}\text{=}1.6,{\alpha }_{\rho }\text{=0.5} $ |
| Case 1.4 | $ \alpha \text{=}1.2 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{=1.09},{\alpha }_{\rho }\text{=}\sqrt{\alpha }\text{=}1.09 $ | | | | |
), ArticleFig(id=1281203019509379377, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Tab.3, caption=
Calculation parameters of the multilayer gradient acoustic coating
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 归一化特征声阻抗 | 平均归一化特征声阻抗 | 分层梯度 | 归一化声速和密度 |
|---|
| Case3.1 | $ \alpha \text{=}0.8,0.8,0.8,0.8,0.8 $ | $ \overline{\alpha }\text{=}0.8 $ | $ \delta =0 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{=}0.77,{\alpha }_{\rho }\text{=}\sqrt{\alpha }\text{=}0.77 $ |
| Case3.2 | $ \alpha \text{=}0.6,0.7,0.8,0.9,1.0 $ | $ \overline{\alpha }\text{=}0.8 $ | $ \delta =0.1 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{,}{\alpha }_{\rho }\text{=}\sqrt{\alpha } $ |
| Case3.3 | $ \alpha \text{=}0.5,0.65,0.8,0.95,1.1 $ | $ \overline{\alpha }\text{=}0.8 $ | $ \delta =0.15 $ |
| Case3.4 | $ \alpha \text{=}0.4,0.6,0.8,1.0,1.2 $ | $ \overline{\alpha }\text{=}0.8 $ | $ \delta =0.2 $ |
| Case3.5 | $ \alpha \text{=}0.3,0.45,0.6,0.75,0.9 $ | $ \overline{\alpha }\text{=}0.6 $ | $ \delta =0.15 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{,}{\alpha }_{\rho }\text{=}\sqrt{\alpha } $ |
| Case3.6 | $ \alpha \text{=}0.7,0.85,1.0,1.15,1.3 $ | $ \overline{\alpha }\text{=1.0} $ | $ \delta =0.15 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{,}{\alpha }_{\rho }\text{=}\sqrt{\alpha } $ |
), ArticleFig(id=1281203019974947122, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=表3, caption=
分层梯度声学覆盖层计算参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 归一化特征声阻抗 | 平均归一化特征声阻抗 | 分层梯度 | 归一化声速和密度 |
|---|
| Case3.1 | $ \alpha \text{=}0.8,0.8,0.8,0.8,0.8 $ | $ \overline{\alpha }\text{=}0.8 $ | $ \delta =0 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{=}0.77,{\alpha }_{\rho }\text{=}\sqrt{\alpha }\text{=}0.77 $ |
| Case3.2 | $ \alpha \text{=}0.6,0.7,0.8,0.9,1.0 $ | $ \overline{\alpha }\text{=}0.8 $ | $ \delta =0.1 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{,}{\alpha }_{\rho }\text{=}\sqrt{\alpha } $ |
| Case3.3 | $ \alpha \text{=}0.5,0.65,0.8,0.95,1.1 $ | $ \overline{\alpha }\text{=}0.8 $ | $ \delta =0.15 $ |
| Case3.4 | $ \alpha \text{=}0.4,0.6,0.8,1.0,1.2 $ | $ \overline{\alpha }\text{=}0.8 $ | $ \delta =0.2 $ |
| Case3.5 | $ \alpha \text{=}0.3,0.45,0.6,0.75,0.9 $ | $ \overline{\alpha }\text{=}0.6 $ | $ \delta =0.15 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{,}{\alpha }_{\rho }\text{=}\sqrt{\alpha } $ |
| Case3.6 | $ \alpha \text{=}0.7,0.85,1.0,1.15,1.3 $ | $ \overline{\alpha }\text{=1.0} $ | $ \delta =0.15 $ | $ {\alpha }_{{\mathrm{c}}}\text{=}\sqrt{\alpha }\text{,}{\alpha }_{\rho }\text{=}\sqrt{\alpha } $ |
), ArticleFig(id=1281203020767670579, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=EN, label=Tab.4, caption=
Calculation parameters of the cylindrical shell ribs
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 肋骨参数 | 肋骨数量 | | 工况 | 肋骨参数 | 肋骨数量 |
|---|
| Case 5.1 | 小肋骨$ \bot \dfrac{\text{6 mm}\times 125\;\;\text{mm}}{\text{8 mm}\times 40\;\;\text{mm}} $ | 9根 | | Case 6.1 | $ \bot \dfrac{12\;\;\text{mm}\times 250\;\;\text{mm}}{16\;\;\text{mm}\times 80\;\;\text{mm}} $ | 0根 |
| Case 5.2 | 中肋骨$ \bot \dfrac{\text{12 mm}\times 250\;\;\text{mm}}{\text{16 mm}\times 80\;\;\text{mm}} $ | | Case 6.2 | 4根 |
| Case 5.3 | 大肋骨$ \bot \dfrac{18\;\;\text{mm}\times 375\;\;\text{mm}}{\text{24 mm}\times 120\;\;\text{mm}} $ | | Case 6.3 | 9根 |
), ArticleFig(id=1281203022155985204, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1281202567929639765, language=CN, label=表4, caption=
圆柱壳肋骨计算参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 肋骨参数 | 肋骨数量 | | 工况 | 肋骨参数 | 肋骨数量 |
|---|
| Case 5.1 | 小肋骨$ \bot \dfrac{\text{6 mm}\times 125\;\;\text{mm}}{\text{8 mm}\times 40\;\;\text{mm}} $ | 9根 | | Case 6.1 | $ \bot \dfrac{12\;\;\text{mm}\times 250\;\;\text{mm}}{16\;\;\text{mm}\times 80\;\;\text{mm}} $ | 0根 |
| Case 5.2 | 中肋骨$ \bot \dfrac{\text{12 mm}\times 250\;\;\text{mm}}{\text{16 mm}\times 80\;\;\text{mm}} $ | | Case 6.2 | 4根 |
| Case 5.3 | 大肋骨$ \bot \dfrac{18\;\;\text{mm}\times 375\;\;\text{mm}}{\text{24 mm}\times 120\;\;\text{mm}} $ | | Case 6.3 | 9根 |
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