摘要
次镜支撑结构性能的好坏直接影响光学系统的成像质量。针对几种典型的支撑结构,利用I-DEAD软件建立有限元模型,进行动力学分析计算。在比较典型结构的基础上,改进得到了2种新型偏置结构,即三翼偏置支撑结构和新型的四翼偏置支撑结构。通过分析表明,在同等条件下,2种新型结构能更大程度地减小遮拦比,提高光学系统质量;或是说,在遮拦比一致以及偏置距离相同的条件下,2种新型支撑结构的一阶谐振频率均大于传统的四翼偏置支撑结构,稳定性能更好,更适用于大口径的光学系统。
Mechanical performance of secondary mirror supporting structure has an important influence on imaging quality of optical system. In order to improve traditional structures, two new supporting structures, namely new offset crossed-plate type and tri-plate offset type, were established through analysing and calculating different dynamic models with I-DEAS software. For the same obstruct ratio, their first order resonant frequencies are both higher than the ones of traditional offset crossed-plate structures at the same offset distance, which indicates that the increased value of tri-plate offset supporting structure is the highest. The proposed structures have better stability and mechanical performance with offset distance increasing, so they are both more suitable to be applied to large-aperture telescope.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2007年第5期859-864,共6页
Chinese Journal of Scientific Instrument
关键词
光学系统
支撑结构
固有频率
有限元分析
optical system
supporting structure
natural frequency
finite element analysis
