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In order to gain insight into the stability of the tracking frame structure of shipborne large-aperture telescopes,the stability of typical ground-level telescope tracking frames was studied. According to the external load borne by the equipment in the case of ship, the external load was parameterized and entered into the finite element software. The pretreatment software and finite element software were used to analyze the structural deformation under static wind load. Then,the natural frequency of the structure was solved, and a simple response spectrum analysis calculation was proposed instead of the tedious random response analysis to analyze the stability of the equipment under dynamic wind load and wave excitation. According to the stress and deformation values obtained from the results, it was ensured that the shipborne telescope tracking frame theoretically meets the strength requirements and design accuracy requirements under shipborne conditions. Under the static wind load, the maximum stress value of the tracking frame structure is about 14.07 MPa, which was less than the yield strength of steel 355 MPa, the maximum deformation variable was about 0.02 mm, which was less than the design accuracy error coaxiality ϕ0.1 mm, and the natural frequency 1st-6th order mode value was 40.15, 49.65, 66.86, 82.93, 91.38,115.89 Hz. Under dynamic wind load, the peak value of structural stress was 3.92 MPa and the maximum deformation variable was 0.01 mm, and under the excitation of ocean waves, the peak of structural stress was 5.88 MPa and the maximum deformation variable was 0.02 mm, which was less than the yield strength and design accuracy error coaxiality of steel. The error between the modal value obtained by the modal test and the calculated modal value is within 10%. Combining theoretical simulation and practical tests, the tracker structure can work normally under shipborne conditions.
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为深入了解船载大口径望远镜跟踪架结构的稳定性,以典型的地平式望远镜跟踪架为基础,对其稳定性进行研究。根据设备在船载、舰载情况下所承受的外部载荷,将外部载荷参数化并输入有限元软件。利用前处理软件联合有限元软件对其在静态风载下的结构变形进行分析。然后对结构固有频率进行求解,提出一种计算简单的响应谱分析,计算代替冗杂的随机响应分析,进而对动态风载和海浪激励下的设备进行稳定性分析。根据分析结果得出的应力和形变值,确保船载望远镜跟踪架在理论上满足船载条件下的强度要求和设计精度要求。在静态风载作用下,求解得到跟踪架结构的最大应力值约为14.07 MPa,小于钢的屈服强度355 MPa;最大形变量约为0.02 mm,小于设计精度误差同轴度ϕ0.1 mm;求解1~6阶固有频率模态值为40.15、49.65、66.86、82.93、91.38、115.89 Hz;在动态风载作用下,求解得到结构应力峰值为3.92 MPa,最大形变量为0.01 mm;在海浪激励作用下,结构应力峰值为5.88 MPa,最大形变量为0.02 mm;均小于钢的屈服强度和设计精度误差同轴度。模态测试试验得到的模态值与计算模态值误差均在10%内,结合理论仿真和实际试验,该跟踪架结构可在船载条件下正常工作。
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1.Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033, China
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1.中国科学院长春光学精密机械与物理研究所,长春 130033
2.中国科学院大学,北京 100049, bio={"content":"
李英杰,男,1999年生,安徽铜陵人,在读硕士研究生;主要研究方向为精密机械设计制造技术;E-mail:lyj990529@163.com。
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李英杰,男,1999年生,安徽铜陵人,在读硕士研究生;主要研究方向为精密机械设计制造技术;E-mail:lyj990529@163.com。
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1.中国科学院长春光学精密机械与物理研究所,长春 130033, bio={"content":"
杨立保,男,1972年生,河北唐山人,博士,研究员,博士研究生导师;主要研究方向为大口径光电跟踪系统关键技术以及空间光学载荷机构;E-mail:yanglibao228@163.com。
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杨立保,男,1972年生,河北唐山人,博士,研究员,博士研究生导师;主要研究方向为大口径光电跟踪系统关键技术以及空间光学载荷机构;E-mail:yanglibao228@163.com。
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2.中国科学院大学,北京 100049)])], figs=[ArticleFig(id=1241400384355365629, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Fig.1, caption=
Tracking rack structure, figureFileSmall=SEVOWcXaD6LAdgXvcOaE5A==, figureFileBig=a2xT0TDQFHhp+TPmJi9KZg==, tableContent=null), ArticleFig(id=1241400384426668803, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=图1, caption=
跟踪架结构, figureFileSmall=SEVOWcXaD6LAdgXvcOaE5A==, figureFileBig=a2xT0TDQFHhp+TPmJi9KZg==, tableContent=null), ArticleFig(id=1241400384569275148, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Fig.2, caption=
Finite element model of tracking rack, figureFileSmall=UFFyEOg0wDgitCOsxSGJZQ==, figureFileBig=6jESCt0u+nWIQsWtkUefVg==, tableContent=null), ArticleFig(id=1241400386058253074, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=图2, caption=
跟踪架有限元模型, figureFileSmall=UFFyEOg0wDgitCOsxSGJZQ==, figureFileBig=6jESCt0u+nWIQsWtkUefVg==, tableContent=null), ArticleFig(id=1241400386192470810, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Fig.3, caption=
Stress and displacement nephogram under static wind load, figureFileSmall=Gia7ldiIaj6WIjZaHNODOQ==, figureFileBig=J81dRtSg2NjNNS0ogc8SVg==, tableContent=null), ArticleFig(id=1241400386280551198, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=图3, caption=
静态风载下应力、位移云图, figureFileSmall=Gia7ldiIaj6WIjZaHNODOQ==, figureFileBig=J81dRtSg2NjNNS0ogc8SVg==, tableContent=null), ArticleFig(id=1241400386360242979, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Fig.4, caption=
1st-3rd order mode displacement nephogram, figureFileSmall=Y64yXmR+jkx9zqFNP8z2UA==, figureFileBig=NblKHTtRzxyR6exkGwGRiA==, tableContent=null), ArticleFig(id=1241400386439934760, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=图4, caption=
1~3阶振型位移云图, figureFileSmall=Y64yXmR+jkx9zqFNP8z2UA==, figureFileBig=NblKHTtRzxyR6exkGwGRiA==, tableContent=null), ArticleFig(id=1241400386540598060, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Fig.5, caption=
Stress and displacement nephogram under dynamic wind load, figureFileSmall=8acVfjMKAiMl+YyIzi8+eQ==, figureFileBig=HJQ9mU3095mxMt18EC+7qQ==, tableContent=null), ArticleFig(id=1241400386641261365, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=图5, caption=
动态风载下应力、位移云图, figureFileSmall=8acVfjMKAiMl+YyIzi8+eQ==, figureFileBig=HJQ9mU3095mxMt18EC+7qQ==, tableContent=null), ArticleFig(id=1241400386725147453, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Fig.6, caption=
Stress and displacement nephogram under sea wave excitation, figureFileSmall=i40FMndH6gXS2caKVtnqTQ==, figureFileBig=+Zw5TNtMuh3248fz6BP8gQ==, tableContent=null), ArticleFig(id=1241400386804839234, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=图6, caption=
海浪激励下应力、位移云图, figureFileSmall=i40FMndH6gXS2caKVtnqTQ==, figureFileBig=+Zw5TNtMuh3248fz6BP8gQ==, tableContent=null), ArticleFig(id=1241400386888725323, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Fig.7, caption=
Sensor placement location, figureFileSmall=nFjKDPgmm28qbgE3AvsXRg==, figureFileBig=fNex1IzchD5wvTAd5FxVlQ==, tableContent=null), ArticleFig(id=1241400386997777237, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=图7, caption=
传感器布置位置, figureFileSmall=nFjKDPgmm28qbgE3AvsXRg==, figureFileBig=fNex1IzchD5wvTAd5FxVlQ==, tableContent=null), ArticleFig(id=1241400387090051930, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Fig.8, caption=
Specific implementation process, figureFileSmall=HtU6CVHi9GVxueGppXLZ7Q==, figureFileBig=N9mG1yfRXOhuONrK79hrfA==, tableContent=null), ArticleFig(id=1241400387232658272, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=图8, caption=
具体实施过程, figureFileSmall=HtU6CVHi9GVxueGppXLZ7Q==, figureFileBig=N9mG1yfRXOhuONrK79hrfA==, tableContent=null), ArticleFig(id=1241400387312350054, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Fig.9, caption=
Test results, figureFileSmall=3Nx0t10Ks/G8gSkwXAqeRw==, figureFileBig=EtYy3gzM0HxG23OECJOv2g==, tableContent=null), ArticleFig(id=1241400387413013356, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=图9, caption=
测试结果, figureFileSmall=3Nx0t10Ks/G8gSkwXAqeRw==, figureFileBig=EtYy3gzM0HxG23OECJOv2g==, tableContent=null), ArticleFig(id=1241400387492705137, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Tab.1, caption=
Modal values of the first 6 orders of the telescope tracking rack structure
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阶数 Order | 频率 Frequency/Hz | 振型 Mode shapes |
|---|
| 1 | 40.15 | 四通及立柱沿水平轴方向摆动 Cross and columns swing along the horizontal axis |
| 2 | 49.65 | 四通及立柱沿垂直于水平轴方向摆动 Cross and columns swing along the direction perpendicular to the horizontal axis |
| 3 | 66.86 | 四通及立柱沿垂直轴摆动 Cross and columns swing along the vertical axis |
| 4 | 78.93 | 左、右立柱沿垂直于水平轴方向摆动 Left and right columns swing perpendicular to the horizontal axis |
| 5 | 87.38 | 四通沿垂直于水平轴旋转趋势 Cross rotates the trend along a perpendicular horizontal axis |
| 6 | 113.89 | 四通沿水平轴摆动 Cross oscillates along the horizontal axis |
), ArticleFig(id=1241400387589174137, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=表1, caption=
望远镜跟踪架结构前6阶模态值
, figureFileSmall=null, figureFileBig=null, tableContent=
阶数 Order | 频率 Frequency/Hz | 振型 Mode shapes |
|---|
| 1 | 40.15 | 四通及立柱沿水平轴方向摆动 Cross and columns swing along the horizontal axis |
| 2 | 49.65 | 四通及立柱沿垂直于水平轴方向摆动 Cross and columns swing along the direction perpendicular to the horizontal axis |
| 3 | 66.86 | 四通及立柱沿垂直轴摆动 Cross and columns swing along the vertical axis |
| 4 | 78.93 | 左、右立柱沿垂直于水平轴方向摆动 Left and right columns swing perpendicular to the horizontal axis |
| 5 | 87.38 | 四通沿垂直于水平轴旋转趋势 Cross rotates the trend along a perpendicular horizontal axis |
| 6 | 113.89 | 四通沿水平轴摆动 Cross oscillates along the horizontal axis |
), ArticleFig(id=1241400387673060222, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Tab.2, caption=
Locations of the test points
, figureFileSmall=null, figureFileBig=null, tableContent=
编号 Number | 坐标 Coordinate/mm | 传感器编号 Sensor number | 传感器灵敏度 Sensor sensitivity |
|---|
| ① | (2 000,250,4 500) | 147980 | 96.7 103.1 100.9 |
| ② | (2 000,-250,4 500) | 147979 | 95.1 97.3 101.2 |
| ③ | (2 000,950,2 180) | 147978 | 96.7 95.3 99.1 |
| ④ | (2 000,-950,2 180) | 148342 | 97.7 99.0 101.8 |
| ⑤ | (-2 000,250,4 500) | 148350 | 98.1 100.0 94.8 |
| ⑥ | (-2 000,-250,4 500) | 147976 | 98.6 100.0 103.0 |
| ⑦ | (-2 000,950,2 180) | 147977 | 96.7 97.0 99.7 |
| ⑧ | (-2 000,-950,2 180) | 148351 | 96.4 100.6 99.3 |
| ⑨ | (1 450,1 450,4 400) | 49254 | 98.4 |
| ⑩ | (1 450,-1 450,4 400) | 49695 | 100.3 |
| ⑪ | (-1 450,1 450,4 400) | 49840 | 99.4 |
| ⑫ | (-1 450,-1 450,4 400) | 49252 | 100.3 |
), ArticleFig(id=1241400387777917827, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=CN, label=表2, caption=
测试点位置
, figureFileSmall=null, figureFileBig=null, tableContent=
编号 Number | 坐标 Coordinate/mm | 传感器编号 Sensor number | 传感器灵敏度 Sensor sensitivity |
|---|
| ① | (2 000,250,4 500) | 147980 | 96.7 103.1 100.9 |
| ② | (2 000,-250,4 500) | 147979 | 95.1 97.3 101.2 |
| ③ | (2 000,950,2 180) | 147978 | 96.7 95.3 99.1 |
| ④ | (2 000,-950,2 180) | 148342 | 97.7 99.0 101.8 |
| ⑤ | (-2 000,250,4 500) | 148350 | 98.1 100.0 94.8 |
| ⑥ | (-2 000,-250,4 500) | 147976 | 98.6 100.0 103.0 |
| ⑦ | (-2 000,950,2 180) | 147977 | 96.7 97.0 99.7 |
| ⑧ | (-2 000,-950,2 180) | 148351 | 96.4 100.6 99.3 |
| ⑨ | (1 450,1 450,4 400) | 49254 | 98.4 |
| ⑩ | (1 450,-1 450,4 400) | 49695 | 100.3 |
| ⑪ | (-1 450,1 450,4 400) | 49840 | 99.4 |
| ⑫ | (-1 450,-1 450,4 400) | 49252 | 100.3 |
), ArticleFig(id=1241400387903746955, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836343935255, language=EN, label=Tab.3, caption=
Relative error of calculated modal and test modal
, figureFileSmall=null, figureFileBig=null, tableContent=
阶数 Order | 试验模态 Test modal/Hz | 计算模态 Calculated modal/Hz | 相对误差 Relative error/% |
|---|
| 1 | 42.84 | 40.15 | 6.27 |
| 2 | 51.43 | 49.65 | 3.42 |
| 3 | 68.62 | 66.86 | 2.56 |
| 4 | 77.60 | 78.93 | 1.71 |
| 5 | 86.58 | 87.38 | 0.92 |
| 6 | 112.55 | 113.89 | 1.19 |
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计算模态与试验模态的相对误差
, figureFileSmall=null, figureFileBig=null, tableContent=
阶数 Order | 试验模态 Test modal/Hz | 计算模态 Calculated modal/Hz | 相对误差 Relative error/% |
|---|
| 1 | 42.84 | 40.15 | 6.27 |
| 2 | 51.43 | 49.65 | 3.42 |
| 3 | 68.62 | 66.86 | 2.56 |
| 4 | 77.60 | 78.93 | 1.71 |
| 5 | 86.58 | 87.38 | 0.92 |
| 6 | 112.55 | 113.89 | 1.19 |
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