Article(id=1228653351672415147, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228653350485422347, articleNumber=null, orderNo=null, doi=10.16385/j.cnki.issn.1004-4523.2024.10.002, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1707235200000, receivedDateStr=2024-02-07, revisedDate=1712937600000, revisedDateStr=2024-04-13, acceptedDate=null, acceptedDateStr=null, onlineDate=1770863386314, onlineDateStr=2026-02-12, pubDate=1730044800000, pubDateStr=2024-10-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1770863386314, onlineIssueDateStr=2026-02-12, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1770863386314, creator=13701087609, updateTime=1770863386314, updator=13701087609, issue=Issue{id=1228653350485422347, tenantId=1146029695717560320, journalId=1225147924628267009, year='2024', volume='37', issue='10', pageStart='1625', pageEnd='1802', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1770863386031, creator=13701087609, updateTime=1770863862999, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1228655351092936954, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228653350485422347, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1228655351092936955, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228653350485422347, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1651, endPage=1659, ext={EN=ArticleExt(id=1228653351877936046, articleId=1228653351672415147, tenantId=1146029695717560320, journalId=1225147924628267009, language=EN, title=A deep neural network method for rapid localization of aircraft abnormal dynamic loads, columnId=null, journalTitle=Journal of Vibration Engineering, columnName=null, runingTitle=null, highlight=null, articleAbstract=
Aircraft often operate in complex and variable dynamic load environment,and dynamic load localization is the primary problem that needs to be solved in this field. This paper focuses on the dynamic load localization requirements of common and prone to abnormal vibrations in aircraft structures. Combining deep neural network,a rapid dynamic load localization method for aircraft structures is developed. By using Long Short-Term Memory (LSTM) neural network,the inverse implicit function model which can accurately describe the corresponding relationship between the dynamic load location and vibration response of the structure is constructed. A dynamic load localization method based on the LSTM neural network classification model is proposed. A simplified finite element model of the entire aircraft structure is established to simulate several typical dynamic load conditions that the aircraft may encounter during actual flight. The noise resistance and robustness of the established deep neural network are also studied. The simulation results show that the proposed method can accurately identify the location of dynamic loads under various load conditions,and can still maintain high locating accuracy under the measurement noise level of 10 dB and the parameter perturbation of 2.8%.
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飞机在服役中往往处于复杂多变的动载荷环境,动载荷定位是需首要解决的问题。本文针对飞机结构多种常见且易引起异常振动的动载荷定位需求,结合深度神经网络,建立了一种面向飞机结构的异常动载荷快速定位方法。采用长短期记忆(Long Short-Term Memory,LSTM)神经网络构建可以精确描述结构所受动载荷的作用位置与振动响应间对应关系的逆向隐式函数模型,提出了基于LSTM神经网络分类模型的动载荷定位技术。建立了简化的全机结构有限元模型,对飞机在实际飞行中可能遇到的几个典型动载荷工况进行了模拟,准确完成了对动载荷的定位,并对所建立深度神经网络的抗噪性、鲁棒性进行了研究。仿真结果表明,所提方法对多种载荷工况下的动载荷位置可以进行准确识别,且在10 dB的测量噪声水平和2.8%的参数摄动下仍能保持较高的定位准确率。
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1School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
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1西北工业大学航空学院, 陕西 西安 710072
3强度与结构完整性全国重点实验室,陕西 西安 710072, bio={"content":"
梁舒雅(1998—),女,博士研究生。E-mail: liangshuya@mail.nwpu.edu.cn。
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梁舒雅(1998—),女,博士研究生。E-mail: liangshuya@mail.nwpu.edu.cn。
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2Sichuan Institute of Aerospace System Engineering, Chengdu 610100, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1228653369267519846, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, authorId=1228653369095553369, language=CN, stringName=徐昕炜, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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2四川航天系统工程研究所, 四川 成都 610100, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1228653368650957111, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, xref=2, ext=[AuthorCompanyExt(id=1228653368655151416, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, companyId=1228653368650957111, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
3National Key Laboratory of Strength and Structural Integrity, Xi’an 710072, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1228653369498206582, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, authorId=1228653369351405932, language=CN, stringName=杨特, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1西北工业大学航空学院, 陕西 西安 710072
3强度与结构完整性全国重点实验室,陕西 西安 710072, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1228653368541905199, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, xref=1, ext=[AuthorCompanyExt(id=1228653368546099504, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, companyId=1228653368541905199, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
3National Key Laboratory of Strength and Structural Integrity, Xi’an 710072, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1228653369821168008, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, authorId=1228653369594675578, language=CN, stringName=王乐, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1西北工业大学航空学院, 陕西 西安 710072
3强度与结构完整性全国重点实验室,陕西 西安 710072, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1228653368541905199, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, xref=1, ext=[AuthorCompanyExt(id=1228653368546099504, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, companyId=1228653368541905199, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
3National Key Laboratory of Strength and Structural Integrity, Xi’an 710072, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1228653370135740819, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, authorId=1228653369938608522, language=CN, stringName=杨智春, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1西北工业大学航空学院, 陕西 西安 710072
3强度与结构完整性全国重点实验室,陕西 西安 710072, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1228653368541905199, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, xref=1, ext=[AuthorCompanyExt(id=1228653368546099504, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, companyId=1228653368541905199, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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2四川航天系统工程研究所, 四川 成都 610100)]), AuthorCompany(id=1228653368785174850, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, xref=3, ext=[AuthorCompanyExt(id=1228653368789369155, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, companyId=1228653368785174850, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3National Key Laboratory of Strength and Structural Integrity, Xi’an 710072, China), AuthorCompanyExt(id=1228653368797757764, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, companyId=1228653368785174850, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3强度与结构完整性全国重点实验室,陕西 西安 710072)])], figs=[ArticleFig(id=1228653372174172625, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.1, caption=
Recurrent neural network structure, figureFileSmall=9Q/MGkODD+/EblETwiO+XQ==, figureFileBig=s8EcONHazuEw7jq8ZW3ZZA==, tableContent=null), ArticleFig(id=1228653372262253014, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图1, caption=
循环神经网络结构, figureFileSmall=9Q/MGkODD+/EblETwiO+XQ==, figureFileBig=s8EcONHazuEw7jq8ZW3ZZA==, tableContent=null), ArticleFig(id=1228653372488745441, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.2, caption=
LSTM unit structure, figureFileSmall=AeqaUdHhiGs44BQGka1hlg==, figureFileBig=U9FXOpYWBSk8OBDZcbkvUA==, tableContent=null), ArticleFig(id=1228653372589408743, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图2, caption=
LSTM单元结构, figureFileSmall=AeqaUdHhiGs44BQGka1hlg==, figureFileBig=U9FXOpYWBSk8OBDZcbkvUA==, tableContent=null), ArticleFig(id=1228653372694266347, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.3, caption=
Flowchart of network training, figureFileSmall=mGx2f9/vWVnaRpMfWx3sIA==, figureFileBig=bx4tGWpmAKu2vq86j0HuDA==, tableContent=null), ArticleFig(id=1228653372807512558, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图3, caption=
网络训练流程图, figureFileSmall=mGx2f9/vWVnaRpMfWx3sIA==, figureFileBig=bx4tGWpmAKu2vq86j0HuDA==, tableContent=null), ArticleFig(id=1228653372895592949, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.4, caption=
LSTM neural network structure diagram, figureFileSmall=9sgJaDPQeDI1aO9iIBIpcQ==, figureFileBig=uhXJ1w18KJQw8NxO6G+mxA==, tableContent=null), ArticleFig(id=1228653372996256246, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图4, caption=
LSTM神经网络结构图, figureFileSmall=9sgJaDPQeDI1aO9iIBIpcQ==, figureFileBig=uhXJ1w18KJQw8NxO6G+mxA==, tableContent=null), ArticleFig(id=1228653373071753723, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.5, caption=
Finite element model of the aircraft structure, figureFileSmall=FhGYodgkgjVC4sgFGhpGhQ==, figureFileBig=AqI10rSXTR92M4MdVXqEZA==, tableContent=null), ArticleFig(id=1228653373143056896, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图5, caption=
全机结构有限元模型, figureFileSmall=FhGYodgkgjVC4sgFGhpGhQ==, figureFileBig=AqI10rSXTR92M4MdVXqEZA==, tableContent=null), ArticleFig(id=1228653373218554371, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.6, caption=
Interior floor structure, figureFileSmall=yMATRNDGb+XW8bIuZ5gVbA==, figureFileBig=udhWMib2Zo1gcTxlsV6OGg==, tableContent=null), ArticleFig(id=1228653373323411976, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图6, caption=
内部地板结构, figureFileSmall=yMATRNDGb+XW8bIuZ5gVbA==, figureFileBig=udhWMib2Zo1gcTxlsV6OGg==, tableContent=null), ArticleFig(id=1228653373428269585, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.7, caption=
Modeling of flaps,rudders,and elevators, figureFileSmall=lDpYjXOJCk1lyBn2t2UoFQ==, figureFileBig=uKxKSIr6QWqbwgmVeNCIKw==, tableContent=null), ArticleFig(id=1228653373516349970, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图7, caption=
襟翼、方向舵、升降舵建模, figureFileSmall=lDpYjXOJCk1lyBn2t2UoFQ==, figureFileBig=uKxKSIr6QWqbwgmVeNCIKw==, tableContent=null), ArticleFig(id=1228653373675733527, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.8, caption=
Three types of random load excitation states, figureFileSmall=8o9ggjwZpfnFGTdw2aRNzA==, figureFileBig=1qNymE3G2aILYA0QX5NYSQ==, tableContent=null), ArticleFig(id=1228653373788979740, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图8, caption=
三种随机载荷激励状态, figureFileSmall=8o9ggjwZpfnFGTdw2aRNzA==, figureFileBig=1qNymE3G2aILYA0QX5NYSQ==, tableContent=null), ArticleFig(id=1228653373864477215, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.9, caption=
Response measurement points distribution, figureFileSmall=NZC3SvW6eorqTmcw6pk0WA==, figureFileBig=3AGeviPQV/Nu9cUubiI8kA==, tableContent=null), ArticleFig(id=1228653373927391778, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图9, caption=
响应测点分布示意图, figureFileSmall=NZC3SvW6eorqTmcw6pk0WA==, figureFileBig=3AGeviPQV/Nu9cUubiI8kA==, tableContent=null), ArticleFig(id=1228653374019666473, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.10, caption=
Single point dynamic load locating results, figureFileSmall=pBMPYEylkCbB6orNr7gEUg==, figureFileBig=WklznATPdLH881BqB1tonw==, tableContent=null), ArticleFig(id=1228653374120329775, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图10, caption=
单点动载荷定位结果, figureFileSmall=pBMPYEylkCbB6orNr7gEUg==, figureFileBig=WklznATPdLH881BqB1tonw==, tableContent=null), ArticleFig(id=1228653374250353203, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.11, caption=
Multi points dynamic load locating results, figureFileSmall=TaIYpTyq0tqo+XZ1MZ7n5w==, figureFileBig=lY1KAc6QEKNgayLO8afJwQ==, tableContent=null), ArticleFig(id=1228653374342627894, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图11, caption=
多点动载荷定位结果, figureFileSmall=TaIYpTyq0tqo+XZ1MZ7n5w==, figureFileBig=lY1KAc6QEKNgayLO8afJwQ==, tableContent=null), ArticleFig(id=1228653374447485500, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.12, caption=
Test signal with SNR=10 dB noise, figureFileSmall=BxXema1/2Sz+SmfKlA1xKA==, figureFileBig=qQVk1EyOT6GhbpKB8/s2Kw==, tableContent=null), ArticleFig(id=1228653374535565890, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图12, caption=
含信噪比为10 dB噪声的测试信号, figureFileSmall=BxXema1/2Sz+SmfKlA1xKA==, figureFileBig=qQVk1EyOT6GhbpKB8/s2Kw==, tableContent=null), ArticleFig(id=1228653374615257670, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.13, caption=
Locating results for neural network anti-noise testing, figureFileSmall=2KzB0HYZFSyAmW8bcRt52A==, figureFileBig=wk9qEFKdiIzXhAs/dfnO+g==, tableContent=null), ArticleFig(id=1228653374707532363, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图13, caption=
神经网络抗噪性测试定位结果, figureFileSmall=2KzB0HYZFSyAmW8bcRt52A==, figureFileBig=wk9qEFKdiIzXhAs/dfnO+g==, tableContent=null), ArticleFig(id=1228653374808195666, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Fig.14, caption=
Locating results for neural network robustness testing, figureFileSmall=Ik7o+PL5p+ycFPp7WaJTxw==, figureFileBig=CZObryJNDqtVwH5izm+AtA==, tableContent=null), ArticleFig(id=1228653374875304534, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=图14, caption=
神经网络鲁棒性测试定位结果, figureFileSmall=Ik7o+PL5p+ycFPp7WaJTxw==, figureFileBig=CZObryJNDqtVwH5izm+AtA==, tableContent=null), ArticleFig(id=1228653374959190619, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Tab.1, caption=
Operating conditions and label instructions
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| 工况 | 激励状态说明 | 标签号 |
|---|
| 工况1 | 左翼襟翼单点激励 | 1 |
| 工况2 | 前起落架舱门单点激励 | 2 |
| 工况3 | 左后机身单点激励 | 3 |
), ArticleFig(id=1228653375093408355, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=表1, caption=
工况及标签说明
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| 工况 | 激励状态说明 | 标签号 |
|---|
| 工况1 | 左翼襟翼单点激励 | 1 |
| 工况2 | 前起落架舱门单点激励 | 2 |
| 工况3 | 左后机身单点激励 | 3 |
), ArticleFig(id=1228653375185683048, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Tab.2, caption=
LSTM neural network training parameters
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| 参数名称 | 值 |
|---|
| 输入特征数 | 6 |
| 隐藏层单元数(Hidden Units) | 100 |
| 批尺寸(Batch Size) | 64 |
| 初始学习率(Initial Learning Rate) | 0.015 |
| 优化器(Optimizer) | Adam |
| 最大迭代(Max Epochs) | 500 |
| 学习率下降周期(Learn Rate Drop Period) | 100 |
| 学习率下降因子(Learn Rate Drop Factor) | 0.5 |
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LSTM神经网络训练参数
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| 参数名称 | 值 |
|---|
| 输入特征数 | 6 |
| 隐藏层单元数(Hidden Units) | 100 |
| 批尺寸(Batch Size) | 64 |
| 初始学习率(Initial Learning Rate) | 0.015 |
| 优化器(Optimizer) | Adam |
| 最大迭代(Max Epochs) | 500 |
| 学习率下降周期(Learn Rate Drop Period) | 100 |
| 学习率下降因子(Learn Rate Drop Factor) | 0.5 |
), ArticleFig(id=1228653375508644462, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Tab.3, caption=
Operating conditions and label instructions
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 激励状态说明 | 标签号 |
|---|
| 工况1 | 左翼襟翼单点激励 | 1 |
| 工况2 | 前起落架舱门单点激励 | 2 |
| 工况3 | 左后机身单点激励 | 3 |
| 工况4 | 左翼襟翼、左后机身同时激励 | 4 |
| 工况5 | 左翼襟翼、前起落架舱门同时激励 | 5 |
| 工况6 | 左后机身、前起落架舱门同时激励 | 6 |
| 工况7 | 左翼襟翼、左后机身、前起落架舱门同时激励 | 7 |
), ArticleFig(id=1228653375600919156, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=表3, caption=
工况及标签说明
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 激励状态说明 | 标签号 |
|---|
| 工况1 | 左翼襟翼单点激励 | 1 |
| 工况2 | 前起落架舱门单点激励 | 2 |
| 工况3 | 左后机身单点激励 | 3 |
| 工况4 | 左翼襟翼、左后机身同时激励 | 4 |
| 工况5 | 左翼襟翼、前起落架舱门同时激励 | 5 |
| 工况6 | 左后机身、前起落架舱门同时激励 | 6 |
| 工况7 | 左翼襟翼、左后机身、前起落架舱门同时激励 | 7 |
), ArticleFig(id=1228653375684805242, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=EN, label=Tab.4, caption=
The first five order frequency changes of the model after the change of elastic modulus
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| 弹性模量/GPa | 第1阶/Hz | 第2阶/Hz | 第3阶/Hz | 第4阶/Hz | 第5阶/Hz |
|---|
| 70 | 2.6779 | 3.5311 | 5.2961 | 6.7550 | 6.8334 |
| 69.5 | 2.6683 | 3.5186 | 5.2773 | 6.7311 | 6.8093 |
| 摄动量 | 0.359% | 0.354% | 0.355% | 0.354% | 0.353% |
| 68 | 2.6393 | 3.4806 | 5.2201 | 6.6583 | 6.7356 |
| 摄动量 | 1.441% | 1.430% | 1.435% | 1.432% | 1.431% |
| 65 | 2.5808 | 3.4032 | 5.1038 | 6.5102 | 6.5858 |
| 摄动量 | 3.626% | 3.622% | 3.631% | 3.624% | 3.623% |
), ArticleFig(id=1228653375785468544, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228653351672415147, language=CN, label=表4, caption=
弹性模量改变后模型前5阶固有频率变化
, figureFileSmall=null, figureFileBig=null, tableContent=
| 弹性模量/GPa | 第1阶/Hz | 第2阶/Hz | 第3阶/Hz | 第4阶/Hz | 第5阶/Hz |
|---|
| 70 | 2.6779 | 3.5311 | 5.2961 | 6.7550 | 6.8334 |
| 69.5 | 2.6683 | 3.5186 | 5.2773 | 6.7311 | 6.8093 |
| 摄动量 | 0.359% | 0.354% | 0.355% | 0.354% | 0.353% |
| 68 | 2.6393 | 3.4806 | 5.2201 | 6.6583 | 6.7356 |
| 摄动量 | 1.441% | 1.430% | 1.435% | 1.432% | 1.431% |
| 65 | 2.5808 | 3.4032 | 5.1038 | 6.5102 | 6.5858 |
| 摄动量 | 3.626% | 3.622% | 3.631% | 3.624% | 3.623% |
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