摘要
空间相机大口径主镜的支撑技术一直是空间相机研制的关键技术。本文介绍了一种相机大口径主镜球铰支撑结构在研制过程中出现的镜面面形随着外界装配条件及温度的变化出现像散的问题,并通过对球铰支撑结构的分析与研究,找出球铰支撑结构的弱点,提出一种新型的柔性支撑结构,通过工程分析及优化确定了柔性支撑结构,利用各种环境试验,证明该支撑结构一阶模态可以达到近200Hz,具有较高的动态刚度;同时,该支撑结构对装配应力与热应力具有较大的适应能力,既能够在较大温度范围内保证镜面面形不变化,又能够保证主镜面形在重力载荷变化时达到指标RMS值为0.02λ(λ=632.8nm)的要求,为空间相机大口径主镜支撑技术打下了坚实的基础。
The supporting structure of the large-aperture primary mirror of the space camera is the key technology for the space camera. This paper presents the problem that the ball-hinge supporting structure of a certain type of primary mirror will lead to the astigmatism when the external condition varies. Based on the research on the ball-hinge supporting structure, a novel flexure supporting structure was developed and optimized with numerical analysis. Some environment experiments were conducted, and the results demonstrated that the supporting structure had large dynamic stiffness, and was better suitable for the assembly stress and thermal stress. This flexure supporting structure makes the mirror surface figure stable in a wide temperature range, and the RMS value of 0.02λ（λ=632.8 nm） when the gravitational load varies, which means the design requirement is satisfied.
出处
《光机电信息》
2011年第10期28-34,共7页
OME Information
基金
国家自然科学基金资助项目(No.60507003)
关键词
大口径
主镜
球铰
柔性支撑
热应力
large-aperture
primary mirror
ball-hinge
flexure supporting structure
thermal stress
