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The mechanical response of external rotor direct drive generator under time-varying loads is analyzed theoretically, calculated by simulation and verified by test. Firstly, the source of magnetic pull of the rotor core of the external rotor generator and its variation with load were analyzed. The expression of magnetic pull of the rotor and the characteristics of time and space order were determined. The basic vibration model of the external rotor core was analyzed, and the basic vibration equation of the external rotor core was determined. Then the simulation model of the external rotor generator was established, and the spatiotemporal order characteristics of the magnetic pull and the typical daily variation rule with time were obtained. The magnetic pull density obtained from the electromagnetic field was used as the input load to guide the structure field. The magnetic-solid coupling simulation was carried out, and the deformation and stress distribution and noise response of the external rotor core were calculated and analyzed. Finally, a simulation example of a 13 kW external rotor direct-drive generator proved the correctness of the analysis and simulation. The results of the study determined the time-varying load on the outer rotor core and its mechanical response distribution. It is found that the time and position of the rotor core should be tested emphatically when the generator is running. Noise characteristics under time-varying loads are also analyzed. The analysis provides reference for the maintenance and design of the generator.
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针对外转子直驱永磁发电机在时变磁拉力载荷作用下外转子铁芯机械响应进行理论解析、仿真计算和试验验证。首先,解析了外转子发电机转子铁芯磁拉力的来源及其随载荷变化规律,确定了转子磁拉力表达式以及时间阶次和空间阶次特征。同时分析了外转子铁芯基本振动模型,确定了外转子铁芯基本振动方程。然后,建立了外转子直驱发电机的仿真计算模型,得到了单位面积磁拉力的时空阶次特征和典型日下随时间变化规律。将电磁场得到的单位面积磁拉力密度作为输入载荷导入结构场,进行磁-固(结构)耦合仿真,计算分析了外转子铁芯在参考时刻的变形和应力的分布及振动噪声响应的变化规律。最后,用一台13 kW外转子直驱发电机模拟实例印证了解析和仿真的准确性。研究结果确定了外转子铁芯所承受的时变载荷及其作用下的机械响应分布规律,发现了发电机运行时转子铁芯应该重点检测的时刻和部位,同时分析了时变载荷下的噪声特性,为发电机的维护和设计提供了一定的参考依据。
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, authorsList=何玉灵, 杨佳文, 孙凯, 吴学伟, 朱晓光, 罗浩然)}, authors=[Author(id=1241699550285590965, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=heyuling1@ncepu.edu.cn, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1241699550390448573, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, authorId=1241699550285590965, language=EN, stringName=Yuling HE, firstName=Yuling, middleName=null, lastName=HE, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1.Hebei Key Laboratory of Electric Machinery Health Maintenance & Failure Prevention, North China Electric Power University,Baoding 071003, China
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1.华北电力大学 河北省电力机械设备健康维护与失效预防重点实验室,保定 071003
2.华北电力大学 苏州研究院,苏州 215000, bio={"content":"
何玉灵,男,1984年生,福建龙岩人,教授,博士研究生导师;主要研究方向为电力设备状态检测及其故障诊断;E-mail:heyuling1@ncepu.edu.cn。
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何玉灵,男,1984年生,福建龙岩人,教授,博士研究生导师;主要研究方向为电力设备状态检测及其故障诊断;E-mail:heyuling1@ncepu.edu.cn。
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1.华北电力大学 河北省电力机械设备健康维护与失效预防重点实验室,保定 071003)]), AuthorCompany(id=1241699550151373230, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, xref=2., ext=[AuthorCompanyExt(id=1241699550163956142, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, companyId=1241699550151373230, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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Air gap magnetomotive force diagram, figureFileSmall=nHlZ8Jv+Z65yyjIf7amH5A==, figureFileBig=dvZSIOPEsmwLrI1zEVWMIQ==, tableContent=null), ArticleFig(id=1241699554865771107, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图1, caption=
气隙磁动势示意图, figureFileSmall=nHlZ8Jv+Z65yyjIf7amH5A==, figureFileBig=dvZSIOPEsmwLrI1zEVWMIQ==, tableContent=null), ArticleFig(id=1241699555096457838, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 2, caption=
Stator core model, figureFileSmall=epPGLTuDtABOed+NsVyLqA==, figureFileBig=LSetMKBPmfvaXnctk/sezQ==, tableContent=null), ArticleFig(id=1241699555205509747, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图2, caption=
转子铁芯模型, figureFileSmall=epPGLTuDtABOed+NsVyLqA==, figureFileBig=LSetMKBPmfvaXnctk/sezQ==, tableContent=null), ArticleFig(id=1241699555281007224, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 3, caption=
Finite element simulation model, figureFileSmall=UsOJi++HVrKTdyP+BVrxwg==, figureFileBig=LoYLmGX1A2ZPZp/OCDMmNQ==, tableContent=null), ArticleFig(id=1241699555369087612, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图3, caption=
有限元仿真模型, figureFileSmall=UsOJi++HVrKTdyP+BVrxwg==, figureFileBig=LoYLmGX1A2ZPZp/OCDMmNQ==, tableContent=null), ArticleFig(id=1241699556874842753, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 4, caption=
Air gap magnetic density waveform, figureFileSmall=cUB06EP7dYdmtiejct7KwQ==, figureFileBig=1rVlP64krXBwRovHur+L7g==, tableContent=null), ArticleFig(id=1241699556962923141, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图4, caption=
气隙磁密度波形, figureFileSmall=cUB06EP7dYdmtiejct7KwQ==, figureFileBig=1rVlP64krXBwRovHur+L7g==, tableContent=null), ArticleFig(id=1241699557126501003, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 5, caption=
Magnetic pull simulation results, figureFileSmall=xBdiivjqwQdY4aSkJHQ3QQ==, figureFileBig=VzAITGNEmvt4eCYrkgIPdg==, tableContent=null), ArticleFig(id=1241699557231358607, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图5, caption=
磁拉力仿真结果, figureFileSmall=xBdiivjqwQdY4aSkJHQ3QQ==, figureFileBig=VzAITGNEmvt4eCYrkgIPdg==, tableContent=null), ArticleFig(id=1241699557311050388, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 6, caption=
Schematic diagram of electromagnetic force changes, figureFileSmall=v2hsDYvQK9k4AdfI+4gaJw==, figureFileBig=xNajzb/UHH3e9UKZzS5VfA==, tableContent=null), ArticleFig(id=1241699557386547862, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图6, caption=
磁拉力变化示意图, figureFileSmall=v2hsDYvQK9k4AdfI+4gaJw==, figureFileBig=xNajzb/UHH3e9UKZzS5VfA==, tableContent=null), ArticleFig(id=1241699557508182680, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 7, caption=
Schematic diagram of the electromagnetic force waveform at reference moments, figureFileSmall=x3wYF39QZ3gysBwAkSNmnQ==, figureFileBig=7fQohZLE32ytsiTqYW1ZMg==, tableContent=null), ArticleFig(id=1241699557604651674, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图7, caption=
参考时刻磁拉力波形示意图, figureFileSmall=x3wYF39QZ3gysBwAkSNmnQ==, figureFileBig=7fQohZLE32ytsiTqYW1ZMg==, tableContent=null), ArticleFig(id=1241699557722092189, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 8, caption=
Ansys external rotor mechanics solution, figureFileSmall=/k5gQjGloOlZMqbECkN26w==, figureFileBig=qPrW2vYeKyAMx7HHpiDuuw==, tableContent=null), ArticleFig(id=1241699557805978273, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图8, caption=
Ansys外转子力学求解, figureFileSmall=/k5gQjGloOlZMqbECkN26w==, figureFileBig=qPrW2vYeKyAMx7HHpiDuuw==, tableContent=null), ArticleFig(id=1241699557923418788, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 9, caption=
Diagram of the external rotor deformation at reference moments, figureFileSmall=HRkJQc70NC8Zik0wgI16eA==, figureFileBig=s2QlbRCoJekWG4xuTxE6Cg==, tableContent=null), ArticleFig(id=1241699557994721959, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图9, caption=
参考时刻外转子变形示意图, figureFileSmall=HRkJQc70NC8Zik0wgI16eA==, figureFileBig=s2QlbRCoJekWG4xuTxE6Cg==, tableContent=null), ArticleFig(id=1241699558078608040, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 10, caption=
Diagram of external rotor stress at reference moments, figureFileSmall=VNwWs70pF7nf5LiuP4ZAbw==, figureFileBig=2ym6XXJLCVO10ZFE5m7YMQ==, tableContent=null), ArticleFig(id=1241699558179271340, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图10, caption=
参考时刻外转子应力示意图, figureFileSmall=VNwWs70pF7nf5LiuP4ZAbw==, figureFileBig=2ym6XXJLCVO10ZFE5m7YMQ==, tableContent=null), ArticleFig(id=1241699558250574511, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 11, caption=
Schematic diagram of noise simulation coupling, figureFileSmall=ZfvcKJ9fPf30CdznjGmzNg==, figureFileBig=YqGpN2Bkj9iLSFyMqqrP7Q==, tableContent=null), ArticleFig(id=1241699558355432115, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图11, caption=
噪声仿真耦合示意图, figureFileSmall=ZfvcKJ9fPf30CdznjGmzNg==, figureFileBig=YqGpN2Bkj9iLSFyMqqrP7Q==, tableContent=null), ArticleFig(id=1241699558430929590, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 12, caption=
Vibration amplitude contrast diagram, figureFileSmall=ZGLDAlQsUi2WvzVlNU+JAg==, figureFileBig=wb/QrrplM9vGEBeaTt0JDA==, tableContent=null), ArticleFig(id=1241699558531592887, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图12, caption=
振动幅值对比图, figureFileSmall=ZGLDAlQsUi2WvzVlNU+JAg==, figureFileBig=wb/QrrplM9vGEBeaTt0JDA==, tableContent=null), ArticleFig(id=1241699558644839101, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 13, caption=
A-weighted sound pressure level nephogram, figureFileSmall=JqPiHdvmRvGbYMbKX8ISHA==, figureFileBig=W5CGupWh2CsfTnEi4Im6eQ==, tableContent=null), ArticleFig(id=1241699558749696705, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图13, caption=
A计权声压级云图, figureFileSmall=JqPiHdvmRvGbYMbKX8ISHA==, figureFileBig=W5CGupWh2CsfTnEi4Im6eQ==, tableContent=null), ArticleFig(id=1241699558841971398, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 14, caption=
Schematic diagram of test setup, figureFileSmall=PItjA3GEyZhf3LEffRsqvg==, figureFileBig=x+0r6vzcpIy+39dFGd7qmA==, tableContent=null), ArticleFig(id=1241699558951023308, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图14, caption=
试验装置示意图, figureFileSmall=PItjA3GEyZhf3LEffRsqvg==, figureFileBig=x+0r6vzcpIy+39dFGd7qmA==, tableContent=null), ArticleFig(id=1241699559043298002, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 15, caption=
Time domain diagram of vibration acceleration, figureFileSmall=x11tggbhvD54QiLiPDDaWA==, figureFileBig=SGPlwdY9KVlGwB0mT2kvUQ==, tableContent=null), ArticleFig(id=1241699559139766999, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图15, caption=
振动加速度时域图, figureFileSmall=x11tggbhvD54QiLiPDDaWA==, figureFileBig=SGPlwdY9KVlGwB0mT2kvUQ==, tableContent=null), ArticleFig(id=1241699559265596125, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 16, caption=
Frequency domain diagram of the vibration acceleration, figureFileSmall=SyXIk7matAlDB5esHi4ZXw==, figureFileBig=nYjp2ymLMK89/KCV17T2zQ==, tableContent=null), ArticleFig(id=1241699559378842335, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图16, caption=
振动加速度频域图, figureFileSmall=SyXIk7matAlDB5esHi4ZXw==, figureFileBig=nYjp2ymLMK89/KCV17T2zQ==, tableContent=null), ArticleFig(id=1241699559534031591, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Fig. 17, caption=
Comparison of magnetic pull and vibration acceleration, figureFileSmall=uCo90VhkpN0ixqLuFolDGw==, figureFileBig=2PWMXK9eydbjlXwxVwnZ2w==, tableContent=null), ArticleFig(id=1241699559664055018, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=图17, caption=
磁拉力和振动加速度比较, figureFileSmall=uCo90VhkpN0ixqLuFolDGw==, figureFileBig=2PWMXK9eydbjlXwxVwnZ2w==, tableContent=null), ArticleFig(id=1241699559760524016, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Tab. 1, caption=
Magnetic pull order
, figureFileSmall=null, figureFileBig=null, tableContent=
| 定子谐波次数Harmonic order of stator v | 转子谐波次数Harmonic order of rotor μ |
|---|
| 8 | 24 | 40 |
|---|
| 2 | 6/0 | 22/2 | 38/4 |
| 10/2 | 26/4 | 42/6 |
| -4 | 12/0 | 28/2 | 44/4 |
| 4/2 | 20/4 | 36/6 |
| 8 | 0/0 | 16/2 | 32/4 |
| 16/2 | 32/4 | 48/6 |
| -10 | 18/0 | 34/2 | 50/4 |
| -2/2 | 14/4 | 30/6 |
| 14 | -6/0 | 10/2 | 26/4 |
| 22/2 | 38/4 | 54/6 |
), ArticleFig(id=1241699559848604404, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=表1, caption=
磁拉力阶次
, figureFileSmall=null, figureFileBig=null, tableContent=
| 定子谐波次数Harmonic order of stator v | 转子谐波次数Harmonic order of rotor μ |
|---|
| 8 | 24 | 40 |
|---|
| 2 | 6/0 | 22/2 | 38/4 |
| 10/2 | 26/4 | 42/6 |
| -4 | 12/0 | 28/2 | 44/4 |
| 4/2 | 20/4 | 36/6 |
| 8 | 0/0 | 16/2 | 32/4 |
| 16/2 | 32/4 | 48/6 |
| -10 | 18/0 | 34/2 | 50/4 |
| -2/2 | 14/4 | 30/6 |
| 14 | -6/0 | 10/2 | 26/4 |
| 22/2 | 38/4 | 54/6 |
), ArticleFig(id=1241699561392108278, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Tab. 2, caption=
Basic parameters of the generator
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 Parameter | 值Value |
|---|
| 额定转速Rated speed/(r/min) | 375 |
| 槽数Number of slots | 54 |
| 极对数Pairs of poles | 8 |
| 定子外径Outer diameter of stator/mm | 305 |
| 定子内径Inner diameter of stator/mm | 78 |
| 转子外径Rotor outer diameter/mm | 360 |
| 内功率因数Internal power factor | 0.8 |
), ArticleFig(id=1241699561543103227, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=表2, caption=
发电机基本参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 Parameter | 值Value |
|---|
| 额定转速Rated speed/(r/min) | 375 |
| 槽数Number of slots | 54 |
| 极对数Pairs of poles | 8 |
| 定子外径Outer diameter of stator/mm | 305 |
| 定子内径Inner diameter of stator/mm | 78 |
| 转子外径Rotor outer diameter/mm | 360 |
| 内功率因数Internal power factor | 0.8 |
), ArticleFig(id=1241699561639572223, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Tab. 3, caption=
Simulation speed setting
, figureFileSmall=null, figureFileBig=null, tableContent=
时刻 Time | 转速 Rotate speed/(r/min) | 时刻 Time | 转速 Rotate speed/(r/min) | 时刻 Time | 转速 Rotate speed/(r/min) |
|---|
| 1 | 78.3 | 9 | 112.1 | 17 | 171 |
| 2 | 83.4 | 10 | 140.5 | 18 | 141.2 |
| 3 | 85.3 | 11 | 156.1 | 19 | 172.8 |
| 4 | 82.5 | 12 | 140 | 20 | 148.7 |
| 5 | 112 | 13 | 158.6 | 21 | 126.8 |
| 6 | 115.6 | 14 | 169.9 | 22 | 124.8 |
| 7 | 120 | 15 | 204.7 | 23 | 132.5 |
| 8 | 130 | 16 | 192 | 24 | 98.7 |
), ArticleFig(id=1241699561777984259, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=表3, caption=
仿真转速设置
, figureFileSmall=null, figureFileBig=null, tableContent=
时刻 Time | 转速 Rotate speed/(r/min) | 时刻 Time | 转速 Rotate speed/(r/min) | 时刻 Time | 转速 Rotate speed/(r/min) |
|---|
| 1 | 78.3 | 9 | 112.1 | 17 | 171 |
| 2 | 83.4 | 10 | 140.5 | 18 | 141.2 |
| 3 | 85.3 | 11 | 156.1 | 19 | 172.8 |
| 4 | 82.5 | 12 | 140 | 20 | 148.7 |
| 5 | 112 | 13 | 158.6 | 21 | 126.8 |
| 6 | 115.6 | 14 | 169.9 | 22 | 124.8 |
| 7 | 120 | 15 | 204.7 | 23 | 132.5 |
| 8 | 130 | 16 | 192 | 24 | 98.7 |
), ArticleFig(id=1241699561870258951, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Tab. 4, caption=
Deformation and stress peak values at reference moments
, figureFileSmall=null, figureFileBig=null, tableContent=
时刻 Time/h | 转速 Rotate speed/(r/min) | 变形峰值 Deformation peak/(10-5 mm) | 应力峰值 Stress peak/MPa |
|---|
| 1 | 78.3 | 3.04 | 0.372 |
| 6 | 115.6 | 3.13 | 0.379 |
| 15 | 204.7 | 3.27 | 0.401 |
| 17 | 171 | 3.24 | 0.395 |
| 18 | 141.2 | 3.19 | 0.388 |
| 21 | 126.8 | 3.15 | 0.383 |
), ArticleFig(id=1241699561962533643, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=表4, caption=
参考时刻下变形和应力峰值
, figureFileSmall=null, figureFileBig=null, tableContent=
时刻 Time/h | 转速 Rotate speed/(r/min) | 变形峰值 Deformation peak/(10-5 mm) | 应力峰值 Stress peak/MPa |
|---|
| 1 | 78.3 | 3.04 | 0.372 |
| 6 | 115.6 | 3.13 | 0.379 |
| 15 | 204.7 | 3.27 | 0.401 |
| 17 | 171 | 3.24 | 0.395 |
| 18 | 141.2 | 3.19 | 0.388 |
| 21 | 126.8 | 3.15 | 0.383 |
), ArticleFig(id=1241699562033836813, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=EN, label=Tab. 5, caption=
Frequency and vibration mode diagram corresponding to the modal order
, figureFileSmall=null, figureFileBig=null, tableContent=
模态阶数 Modal order | 模态频率 Modal frequency/Hz | 振型图 Vibration mode diagram |
|---|
| 2 | 333.9 |  |
| 3 | 933.4 |  |
| 4 | 1 765.1 |  |
| 5 | 2 801.3 |  |
), ArticleFig(id=1241699562109334288, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241699536540857280, language=CN, label=表5, caption=
模态阶数对应频率和振型图
, figureFileSmall=null, figureFileBig=null, tableContent=
模态阶数 Modal order | 模态频率 Modal frequency/Hz | 振型图 Vibration mode diagram |
|---|
| 2 | 333.9 |  |
| 3 | 933.4 |  |
| 4 | 1 765.1 |  |
| 5 | 2 801.3 |  |
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