摘要
为提高同轴空间相机次镜安装结构的稳定性,减小因次镜位置变化对相机成像质量的影响,深入研究了次镜支架结构。针对同轴长焦距相机光学系统的特点和传统次镜支架存在的不足,基于三角形稳定的原理设计了一种新型次镜支架,有限元分析结果表明:在相同质量条件下,该结构的基频、抗扭刚度和沿光轴方向的刚度相对传统结构均大大提高,其中基频提高了20%以上。为验证该结构的可行性,研制了两种钛合金样机结构。试验表明,轻量化后的支架质量仅1.7kg,基频可达293Hz。该结构解决了传统次镜支架结构刚度低、基频低的难题,并实现了高轻量化和高比刚度,容易加工和装配,适用于可见光和红外多种类型空间相机,已在某可见光空间相机中成功应用。
To improve stability of the secondary mirror in coaxial reflective space telescope and reduce influence of position changes on imaging quality,the supporting structure of secondary mirror was studied in this paper.According to the disadvantages of traditional supporting structures and the requirements of a coaxial optical system with long focal length,a three vanes with triangular hub supporting structure was designed.The analysis results show that torsional stiffness,fundamental frequency and stiffness along optical axis are much higher than traditional structures,and its fundamental frequency is improved more than 20%.Titanium alloy prototype was developed to verify the feasibility of the structure.Environmental tests show that the structure only weights 1.7 kg,and its fundamental frequency is higher than 293 Hz.The new supporting structure overcomes the shortcomings of traditional structures,such as low stiffness,low fundamental frequency,and has advantages of low weight,high specific stiffness,easy processing etc.The structure has been used successfully in a coaxial reflective space telescope.
出处
《红外与激光工程》
EI
CSCD
北大核心
2012年第9期2401-2404,共4页
Infrared and Laser Engineering
基金
国家863计划(2007AA12Z113)
关键词
次镜支架
扭转刚度
基频
振动试验
supporting structure of secondary mirror
torsional stiffness
fundamental frequency
environmental test
