CAJ | 학술논문

为了补偿空间相机由于地面定标环境和在轨工作环境不同及发射时振动冲击引起的焦面离焦，保证空间相机在轨成像质量，设计了焦面调焦机构。首先，针对尺寸超长焦面，采用增设调焦内框来增加焦面基板刚度，通过蜗轮蜗杆传动驱动丝杠运动实现机构自锁。其次，利用有限元分析软件patran/nastran建立了调焦机构的有限元模型，用mpc模拟导轨连接，对调焦机构进行模态分析。最后，对调焦机构进行了力学试验验证和精度测试。试验及测试结果表明：设计的调焦机构动态刚度高，一阶计算模态为228.7 Hz，而试验得到一阶模态为223.9 Hz，两者相差2%；调焦灵敏度达0.25μm，调焦精度达到6.3μm，焦面基板两端同步误差达到±4μm，满足航天相机对调焦机构高分辨率、高精度、高可靠性的要求。
위료보상공간상궤유우지면정표배경화재궤공작배경불동급발사시진동충격인기적초면리초，보증공간상궤재궤성상질량，설계료초면조초궤구。수선，침대척촌초장초면，채용증설조초내광래증가초면기판강도，통과와륜와간전동구동사강운동실현궤구자쇄。기차，이용유한원분석연건patran/nastran건립료조초궤구적유한원모형，용mpc모의도궤련접，대조초궤구진행모태분석。최후，대조초궤구진행료역학시험험증화정도측시。시험급측시결과표명：설계적조초궤구동태강도고，일계계산모태위228.7 Hz，이시험득도일계모태위223.9 Hz，량자상차2%；조초령민도체0.25μm，조초정도체도6.3μm，초면기판량단동보오차체도±4μm，만족항천상궤대조초궤구고분변솔、고정도、고가고성적요구。
To compensate focusing offset of space camera, which was caused by environment difference between ground and on the track and maybe caused by shock when launching, a focal plane focusing device was designed to ensure image quality. First, for focal plane was so large, focusing frame was designed to enhance focal plane rigidity, self-lock was achieved through worm wheel driving screw. Second, fem model was established and mode analysis was achieved by patran/nastran, in which simulate guide rail by mpc. Finally, carried out dynamic environment testing and precision testing. Test results revealed that focusing device had dynamic frequency, first analysis characteristic frequency was 228.7 Hz, and first test characteristic frequency was 223.9 Hz, the relative error was 2%. Focusing resolution was 0.25μm, focusing precision was 6.3μm, synchronization error on focal plane was ±4μm. It can meet high resolution, high precision, high reliability needs of space camera.