1 中国科学院长春光学精密机械与物理研究所, 吉林 长春130033
2 中国科学院大学, 北京 100049
3 长春工业大学 机电工程学院, 吉林 长春 130012
光纤传像模块是大视场天基望远镜关键部件之一, 其支撑结构的刚度特性对于物镜的工作寿命有至关重要的影响。为了在振动载荷作用下, 在保证物镜寿命的同时降低支撑结构的重量, 在拓扑优化的基础上, 以光学玻璃惰性强度和结构基频为优化约束对光纤传像模块支撑结构进行了优化。首先, 阐述了光学元件惰性强度的计算方法并确定了优化过程中耦合光纤的同心物镜惰性强度的边界值; 其次, 根据系统参数确定了光纤束的布局并设计了初始支撑结构; 最后, 在拓扑优化的基础上, 建立了以耦合光纤的同心物镜惰性强度和支撑结构基频为优化约束的集成优化模型, 并利用isight集成优化平台进行了计算。计算结果表明: 在满足优化约束的情况下, 优化后的质量降低了11.4%, 取得了明显的减重效果。提出的优化方法为物镜与光纤束耦合类的光机结构设计提供了参考。
光纤传像模块 应力失效 惰性强度 结构优化 optical fiber image transmission module stress failure inert strength structure optimization 红外与激光工程
2019, 48(5): 0518002
1 中国科学院长春光学精密机械与物理研究所, 吉林 长春130033
2 中国科学院大学, 北京 100049
3 长春工业大学 机电工程学院, 吉林 长春 130012
为了在机载振动环境下获得满足光学性能指标要求的偏振成像光谱仪镜头的最佳结构性能, 建立了基于视轴抖动误差的优化模型, 并在Isight集成优化环境下对该模型进行了求解。首先, 阐述了视轴抖动误差影响光学系统性能的原理并根据光学系统模型和指标需求设计了镜头的初始结构; 其次, 推导了视轴抖动误差的计算方法并建立了基于视轴抖动误差的优化模型; 最后, 在Isight环境下, 使用多岛遗传算法对优化模型进行了求解。结果表明: 在满足镜头视轴抖动误差的要求下, 镜筒质量降低了17.4%, 镜头光学系统传函为0.4(77 lp/mm), 满足设计指标要求。提出的优化方法引入镜头视轴抖动误差作为优化约束, 拓展了光机结构优化的内涵, 为同类结构的优化提供了新的思路。
视轴抖动误差 光机结构优化 光学系统传递函数 集成优化 line of sight jitter error optomechanic structure optimization optical transfer function integrated optimization 红外与激光工程
2019, 48(1): 0118005
1 Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2 University of Chinese Academy of Sciences, Beijing 100039, China
3 Changchun University of Technology, Changchun 130012, China
Although the performance of space cameras has largely improved, the micro vibration from flywheel disturbances still significantly affects the image quality of these cameras. This study adopted a passive isolation method to reduce the negative effect of flywheel disturbance on image quality. A metal-rubber shock absorber was designed and installed in a real satellite. A finite element model of an entire satellite was constructed, and a transient analysis was conducted afterward. The change in the modulate transfer function was detected using ray tracing and optical transfer function formulas. Experiments based on real products were performed to validate the influence of the metal-rubber shock absorber. The experimental results confirmed the simulation results by showing that the negative effects of flywheel disturbance on the image quality of space cameras can be diminished significantly using the vibration isolation method.
micro vibration micro vibration modulate transfer function modulate transfer function vibration isolation vibration isolation flywheel disturbance flywheel disturbance Frontiers of Optoelectronics
2017, 10(1): 80
Author Affiliations
Abstract
1 National & Local United Engineering Research Center of Small Satellite Technology, Changchun Institute of Optics, Fine Mechanics, and Physics ,Chinese Academy of Sciences, Changchun, 130033, China
2 University of Chinese Academy of Sciences, Beijing, 100039, China
3 Changchun University of Technology, Changchun, 130012, China
When a satellite is in orbit, its flywheel will generate micro vibration and affect the imaging quality of the camera. In order to reduce this effect, a rubber shock absorber is used, and a numerical model and an experimental setup are developed to investigate its effect on the micro vibration in the study. An integrated model is developed for the system, and a ray tracing method is used in the modeling. The spot coordinates and displacements of the image plane are obtained, and the modulate transfer function (MTF) of the system is calculated. A satellite including a rubber shock absorber is designed, and the experiments are carried out. Both simulation and experiments results show that the MTF increases almost 10 %, suggesting the rubber shock absorber is useful to decrease the flywheel vibration.
Micro vibration flywheel rubber shock absorber integrated modeling MTF isolation experiment Photonic Sensors
2016, 6(4): 372
