Optimized design of flexible membrane used for large-aperture primary mirror support cylinder
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摘要: 在大口径望远镜主镜液压支撑形式中,液压缸需要一种简单可靠、不需要润滑维护的精密导向机构,而且可以输出较大行程范围(毫米级)。设计了一种柔性金属膜片机构用于液压缸的径向定位导向。建立了金属膜片机构有限元模型,采用几何非线性算法,研究分析了不同拓扑结构对金属膜片柔度的影响,通过不同拓扑结构金属膜片的性能分析对比可知,V 型膜片能够很好地克服应力刚化,保证柔度的稳定性;以柔度为优化目标,对金属膜片V 型的位置尺寸和形状尺寸进行了优化设计,金属膜片在导向方向上的柔度提高了14.2%;搭建了柔性金属膜片机构柔度测试平台,验证了仿真计算结果。结合实验和仿真结果可知:V 型柔性金属膜片具有良好的定位导向性能,对用于液压支撑的液压缸和主动光学的微位移促动器的导向机构的设计具有指导意义。Abstract: For large-aperture primary mirror hydraulic support system, a simple and reliable precision guiding mechanism is needed to give a larger stroke range (mm) for cylinders, which did not require lubrication and maintenance. In this paper, a flexible metal membrane was designed for the cylinder guiding and radial positioning. With the method of finite elements and nonlinear geometry algorithms adopted, an analysis was carried on the flexible membrane with different topologies, it was shown that V-shape metal membrane could well overcome stress stiffening and maintain the stability of flexibility; with flexibility as the optimization target, optimize the V-shape position and geometry dimensions of membrane V-shape, and the guiding flexibility of metal membrane was improved by 14.2%; established the experimental platform, did experiments and verify the simulation results. According to the experiment and simulation results, the V-shape membrane is found not only having a good flexibility in the vertical surface direction, but also ensuring the stability of flexibility by avoiding stress stiffening. These founds give a certain guidance in the design and application of the guiding mechanism for hydraulic support cylinders and active micro-displacement actuator.
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Key words:
- flexible metal membrane /
- hydraulic support /
- positioning guide /
- optimization
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[1] Cheng Jingquan. 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. [2] [3] [4] Wang Fuguo, Shao Liang, Wu Xiaoxia, et al. Review of foreign groundbased telescope primary mirror support [J]. Laser Infrared, 2011, 42(3): 237-243. (in Chinese) 王富国, 邵亮, 吴小霞, 等. 国外大型地基望远镜主镜支撑综述[J]. 激光与红外, 2011, 42(3): 237-243. [5] Ernst-Dieter knohl, Carl Zeiss Oberkochene. VLT primary support system[C]//SPIE, 1994, 2199: 271-283. [6] [7] [8] Thierry hovsepian, Jean Marc Michelin, Stephano Stanghellini. Design and tests of the VLT M1 Mirror passive and Active supporting system [C]//SPIE, 1998, 3352: 424-435. [9] Larry Stepp, Eugene Huang, Myung Cho. Gemini primary mirror support system[C]//SPIE, 1994, 2199: 223-238. [10] [11] Kaercher H J, Peter E, Marth Sss, et al. Mechanical principles of large mirror supports [C]//SPIE, 2010, 7733: 201-2012. [12] [13] Kimbrell J E, David Greenwald. AEOS 3.67mTelescope primary mirror active control system [C]//SPIE, 1998, 3352: 400-411. [14] [15] Shao Liang. Mechanism design and research of micro-displacement actuator based on giant magnetostrictive cell[D]. Nanjing: Nanjing Institute of Astronomical Optics Technology,2009. (in Chinese) 邵亮. 基于磁致元件的微位移促动器的机构设计研究[D]. 南京: 中国科学:南京天文光学技术研究所,2009. [16] [17] [18] Liu Zhengyu, Luo Xiao, Deng Weijie, et al. Multi-mode optimization for large optical aspheric mirror [J]. Optics and Precision Engineering, 2013, 21(11): 2791-2793. (in Chinese) 刘振宇, 罗霄, 邓伟杰, 等. 大口径非球面的组合加工[J]. 光学精密工程, 2013, 21(11): 2791-2793. [19] [20] Shao Liang, Yang Dehua, Chen Kunxin, et al. Review of mechanical structure of Micreo-displacement actuator for optical astronomical telescope [J]. China Academic Journal, 2009, 27(1): 70-79. (in Chinese) 邵亮, 杨德华, 陈昆新, 等. 光学天文望远镜用微位移驱动器机构研究综述[J]. 天文学进展, 2009, 27(1): 70-79. [21] [22] Yu Xinfeng, Gong Yan, Ni Mingyang, et al. Optical surface figure of lens under kinematic mount apparatus and its reproducibility [J]. Optics and Precision Engineering, 2013, 21(8): 2000-2007. 于新峰, 巩岩, 倪明阳, 等. 基于运动学支撑的透镜光学表面面形及其复现性[J]. 光学精密工程, 2013, 21 (8): 2000-2007. [23] Larry L Howell. Compliant Mechanisms [M]. John Wiley Sons, Inc. 2001: 18-32 [24] [25] Wang Xuli. Finite Element Method [M]. Beijing: Tsinghua University Press, 2003. (in Chinese) 王勖力. 有限元法[M]. 北京: 清华大学出版社, 2003. -
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