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TMT 三镜镜室组件柔性结构设计与屈曲分析

Design and buckling analysis of TMT tertiary mirror cell assembly flexure structure

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摘要

30 m望远镜三镜为长轴3.594 m,短轴2.536 m的椭圆形微晶玻璃反射镜。其支撑结构采用了多种柔性结构,以释放非支撑方向的自由度。使得轴向支承和侧向支撑能够相互解耦,并减小支撑结构与镜子材料的热胀系数不匹配带来的热应力。柔性件柔度越高,在望远镜观测条件的扰动下镜面面形越好。但过高的柔度会降低柔性件的屈曲临界载荷,导致结构发生屈曲失效。为此需要计算出望远镜观测过程中柔性结构所承受的最大压力载荷,计算相应的屈曲安全系数SFBuckling。对比了典型结构非线性屈曲分析和特征值屈曲分析的区别,不断迭代设计和分析,柔性元件的SFBuckling和柔度取得了一个较好的平衡点,热扰动下的面形也达到了设计要求。

Abstract

Thirty Meter Telescope′s tertiary mirror is an elliptical ceramic glass reflector whose major axis is 3.594 m and minor axis is 2.536 m. Flexure structure was widely used in the mirror′s support structure to release all the other degree of freedom except those along the support direction. The design decoupled the axial and lateral support and reduce the thermal stress due to the material mismatch. The higher compliance would benefit the telescope′s mirror surface under distortion, but the buckling criteria load would decrease correspondingly, either. So the limit load of each flexure structure should be calculated as the design input. And the buckling safety factor SFBuckling was analyzed for each part under the limit loads. Eigenvalue buckling analysisand nonlinear buckling analysis were both taken and compared. Based on the analysis results, the design were optimized iteratively to achieve balanced values of compliance for all the flexure. The mirror surface error under thermal distortion met the design requirements.

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中图分类号:TH751

所属栏目:光学设计与光机结构

基金项目:国家自然科学基金(11403022)

收稿日期:2015-04-05

修改稿日期:2015-05-10

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作者单位    点击查看

郭鹏:中国科学院长春光学精密机械与物理研究所,吉林 长春 130033中国科学院大学,北京 100049
张景旭:中国科学院长春光学精密机械与物理研究所,吉林 长春 130033
杨飞:中国科学院长春光学精密机械与物理研究所,吉林 长春 130033
赵宏超:中国科学院长春光学精密机械与物理研究所,吉林 长春 130033
王富国:中国科学院长春光学精密机械与物理研究所,吉林 长春 130033

联系人作者:郭鹏(guopengmse@gmail.com)

备注:郭鹏(1989-),男,硕士生,主要从事大口径望远镜支撑结构方面的研究工作。

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引用该论文

Guo Peng,Zhang Jingxu,Yang Fei,Zhao Hongchao,Wang Fuguo. Design and buckling analysis of TMT tertiary mirror cell assembly flexure structure[J]. Infrared and Laser Engineering, 2015, 44(12): 3650-3655

郭鹏,张景旭,杨飞,赵宏超,王富国. TMT 三镜镜室组件柔性结构设计与屈曲分析[J]. 红外与激光工程, 2015, 44(12): 3650-3655

被引情况

【1】安其昌,张景旭,杨飞,赵宏超. PSSn在大口径望远镜误差评估中的应用. 红外与激光工程, 2016, 45(12): 1218001--1

【2】安其昌,张景旭,杨 飞,赵宏超. 基于串联机械臂的稀疏孔径望远镜装调. 红外与激光工程, 2018, 47(8): 818002--1

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