| 长线阵大负载焦平面调焦机构设计 |
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| 引用本文： | 范俊杰,李富强,蔡伟军,李庆林,张占东,丁世涛.长线阵大负载焦平面调焦机构设计[J].红外与激光工程,2021,50(11):20210270-1-20210270-7. |
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| 作者姓名： | 范俊杰 李富强 蔡伟军 李庆林 张占东 丁世涛 |
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| 作者单位： | 1.北京空间机电研究所，北京 100094 |
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| 基金项目： | 十三五民用航天三批（A0302） |
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| 摘 要： | 空间相机运载过程的冲击振动及在轨复杂力热环境的影响容易导致相机焦平面与像面的不重合，产生离焦问题。针对长线阵大负载焦平面离焦问题，设计了一种调焦机构。该机构采用两套机构驱动，可以提供大的驱动力矩，并采用两组过约束导轨保证其力学性能。每套驱动机构由步进电机、滚珠丝杠、编码器、滚动导轨和齿轮系组成。对调焦机构建立了有限元仿真分析模型，通过模态分析，验证了该结构具有较好的刚性，能够满足相应的力学条件要求。后续通过力学试验后的精度测试对调焦精度、稳定性精度分析表明:该调焦机构的调焦精度为3.8 μm，稳定性小于5″, 同步精度为1.1 μm。设计及试验证明，该调焦机构具有较高的调焦精度和可靠性，可以满足一定范围内长线阵焦面精密调焦需要。
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| 关 键 词： | 空间相机 调焦机构 长焦面 过约束导轨 |
| 收稿时间： | 2021-04-28 |
Design of focusing mechanism for long array focal plane with heavy load |
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| Fan Junjie,Li Fuqiang,Cai Weijun,Li Qinglin,Zhang Zhandong,Ding Shitao.Design of focusing mechanism for long array focal plane with heavy load[J].Infrared and Laser Engineering,2021,50(11):20210270-1-20210270-7. |
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| Authors: | Fan Junjie Li Fuqiang Cai Weijun Li Qinglin Zhang Zhandong Ding Shitao |
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| Affiliation: | 1.Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China2.Key Laboratory for Advance Optical Remote Sensing Technology of Beijing, Beijing 100094, China |
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| Abstract: | The focal plane of a space camera will defocus under the launching vibration and shock and complex environmental conditions in space which are changeable. In order to compensate defocusing for focusing mechanism that is long array focal plane with heavy load, a focusing mechanism was designed. This focusing mechanism was driven by two sets of motion mechanism that could provide large driving torque. The two overconstrained lead rails could meet the need of mechanical property. Every mechanism contained a stepper motor, a screw, a encoder, a rolling guide and gear transmission. The finite-element emulation analysis method was used to establish simulation model of focusing mechanism. Through the modal analysis, it verified that this mechanism had a better rigidity and could meet dynamic requirement. Analysis of focusing precision and stability accuracy indicate that the focusing precision of focusing mechanism is 3.8 μm, the stability is less than 5″ and the synchronization precision is 1.1 μm. The design analysis and experimental results show that the focusing mechanism has high focusing precision and high reliability, which can make use of precision adjustment of long focal plane. |
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