中小口径次镜支撑结构的动力学性能分析  

Dynamic Analysis for Supporting Structure of Middle/little Aperture Second Mirror

作　　者：贾庆莲[1] 邓文渊[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033

出　　处：《长春理工大学学报（自然科学版）》2011年第1期57-60,共4页Journal of Changchun University of Science and Technology(Natural Science Edition)

摘　　要：针对口径在800mm以内的中小口径次镜支撑结构,采用有限元分析方法,利用Ansys软件对其梁片的厚度、长度及在支撑结构中的位置进行了一阶谐振频率及轴向变形分析。仿真结果表明在遮拦比一致的情况下,系统口径的增加导致次镜支撑结构的一阶谐振频率下降很快。当口径较小时,不同支撑结构的刚度都较好,由此引起结构谐振频率变化不大但都能很好的满足要求,因此可以选择加工工艺最简单的结构。而当口径较大时,不同结构的谐振频率差别较大,其中最高的为四翼偏置结构,但在不同口径时,几种结构的谐振频率的数值变化规律是相同的。当口径超过650mm时改变梁片厚度,结构的一阶谐振频率会相应变化,其中变化最大的为三翼对称结构,对相同的梁片厚度四翼偏置结构的谐振频率最高且轴向变形最小。The first order resonant frequency and axis-direction deformation of supporting structure of aperture less than 800 second mirror were analyzed by finite element analysis to the increased thickness,length and the position.The simulation results showed that for the same obstruct ratio,the resonant frequency increnased with the increasing of aperture.When the aperture was little,different supporting structures have both larger approximate resonant frequency than the large aperture＇s and finer rigidity,so the supporting structure could be simple.When the aperture was large,resonant frequency was much different for different supporting structure,while the change rule of resonant frequency was same to different structure.Among the traditional structures,the offset crossed plate type was the greatest.the Resonant frequency was larger and axis-direction deformation was smaller with the increase of Lamina thickness.

关 键 词：次镜支撑 通光口径 谐振频率 有限元分析 

分 类 号：TH703[机械工程—仪器科学与技术]