TMT M3 system tilt axis bearing method
-
摘要: 30 m口径望远镜(TMT)的三镜跟踪系统(M3PA)的运动性能和指向精度指标均高于已建成的各大望远镜,且工况复杂多变,给设计人员带来了巨大的挑战。三镜跟踪系统包括Rotator 轴和Tilt轴两部分。重点研究了Tilt 轴轴承布置方案以及相应分析。提出了两种轴承方案,经过分析,使用一对双列角接触转盘轴承的方案更适合于Tilt 轴的工作需要,此时结构第一阶谐振频率可达到15.1Hz,满足Tilt 轴的设计要求。选定方案后,针对所选择的轴承,使用ANSYS 进行了仿真。仿真结果显示,所选轴承中滚动体的最大承载达到5 000 N,最大应力大约为2 300 MPa,承载曲线满足经典余弦分布,从而证明仿真数据可靠,模拟方法可信;另外四列滚动体上都有明显的承载,从而说明所选择的轴系能够很好地将载荷分散到两侧结构架上。分析结果表明,这种结构形式能够满足TMT 三镜系统对刚度要求。
-
关键词:
- 30 m 望远镜项目 /
- 轴承布置形式 /
- 轴承模拟 /
- 有限元仿真
Abstract: The tertiary mirror pointing assembly(M3PA) of the thirty meters telescope(TMT) is the largest tertiary mirror in the world. The tracking and pointing performance of M3PA is better than any other telescopes which have been built, and the working condition is even worse. So the designers face an enormous challenge. The tracking system includes the bottom rotator axes and the tilt axes. The study of this paper focused on the tilt axes. There were two bearing arrangement methods for the tilt axes. The first one used two single angular contact bearing to stand the shaft. The second used two double rows angular contact bearings. They both met the requirement when the M3PA was vertical. But the first method became invalid when the M3PA was horizontal, while the second can provide a better support about 15.1 Hz of the first modal frequency. Then some FEA were done to find out the carrying capacity of the bearings. The results show that the maximum load applied on the rollers is up to 5 000 N, while the maximum stress is up to 2 300 MPa. Otherwise, the load distribution just likes a cosine curve. So it can be found that the analysis is believable. In addition, there are evident load applied on the four rows rollers, which proves that the bearing arrangement can disperse the load effectively. It can be concluded that the selection of the bearing arrangement is a good choice for TMT tilt axes design.-
Key words:
- TMT /
- bearingarrangement /
- bearingsimulation /
- FEM
-
[1] [2] TMT Group. Design Requirements Document for Tertiary Mirror System(M3S)[Z]. TMT OPT DRD. 07. 006. REL29. 2012. [3] [4] Cheng J Q. Principles of Astronomical Telescope Design[M]. Beijing: China Science Technology Press, 2003. (in Chinese) 程景全. 天文望远镜原理和设计[M]. 北京: 中国科学技术出版社, 2003. [5] Sun Hang, Zhang Haibo, Cao Lihua, et al. Error compensation for primary mirror shaking of large aperture optical detection equipme nt[J]. Optics and Precision Engineering, 2014, 22 (1): 85-91. (in Chinese) 孙航, 张海波, 曹立华, 等. 大口径光电探测设备主镜晃动的误差补偿[J]. 光学精密工程, 2014, 22(1): 85-91. [6] [7] [8] Guo Ning, Lv Junwei, Deng Jiangsheng. Design of filter only by angle information in opto-electronic tracking system[J]. Optics and Precision Engineering, 2013, 21(7): 1818-1824. (in Chinese) 郭宁, 吕俊伟, 邓江生. 光电跟踪系统纯角度滤波器的设计[J]. 光学精密工程, 2013, 21(7): 1818-1824. [9] Shi Jinfeng, Wu Qingwen, Yang Xianwei, et al. Thermal design of vertical collimator with large aperture and long focus [J]. Infrared and Laser Engineering, 2013, 42 (6): 1617-1622. (in Chinese) 石进峰, 吴清文, 杨献伟, 等. 光轴竖直大口径长焦距平行光管热设计[J]. 红外与激光工程, 2013, 42(6): 1617-1622. [10] [11] [12] Liu Shutian, Hu Rui, Zhou Ping, et al. Topologic optimization for configuration design of web-skin-type ground structure based large-aperture space mirror [J]. Optics and Precision Engineering, 2013, 21(7): 1803-1810. (in Chinese) 刘书田, 胡瑞, 周平, 等. 基于筋板式基结构的大口径空间反射镜构型设计的拓扑优化方法[J]. 光学精密工程, 2013, 21(7): 1803-1810. [13] [14] Wang Haiyang, Li Li, Jing Ning, et al. Design of MWIR continuous zoom optical system with large zoom range [J]. Infrared and Laser Engineering, 2013, 42(2): 398-402. (in Chinese) 王海洋, 李力, 金宁, 等. 大变倍比中波红外连续变焦光学系统设计[J]. 红外与激光工程, 2013, 42(2): 398-402. [15] Genberg V, Michels G. Making FEA results useful in optical analysis[C]//SPIE, 2002, 4769: 24-33. [16] [17] An Qichang, Zhang Jingxu, Zhang Limin. Dynamics analysis of telescope third mirror wire support structure [J]. Infrared and Laser Engineering, 2013, 42(8): 2115-2119. (in Chinese) 安其昌, 张景旭, 张丽敏. 望远镜次镜钢索支撑结构动力学分析[J]. 红外与激光工程, 2013, 42(8): 2115-2119. [18] [19] Su Yanqin, Zhang Jingxu, Yang Fei, et al. Conceptual design of rotator assembly bearing in TMT tertiary mirror system[J]. Optics and Precision Engineering, 2013, 21(6): 1510-1517. (in Chinese) 苏燕芹, 张景旭, 杨飞, 等. 30 m望远镜的三镜Rotator 组件轴承概念设计[J]. 光学精密工程, 2013, 21(6): 1510-1517. -
点击查看大图
计量
- 文章访问数: 363
- HTML全文浏览量: 50
- PDF下载量: 214
- 被引次数: 0
下载:
