| 星载大口径SiC平面反射镜的优化设计及应用 |
| 投稿时间：2025-03-09 修订日期：2025-03-27 点此下载全文 |
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| 中文摘要:针对空间相机二维指向机构中碳化硅平面反射镜的轻量化与刚度提升需求，提出基于半封闭背板结构的创新设计方案。通过构建背部半封闭拓扑构型替代传统开放结构，结合工艺孔尺寸调控实现刚度提升。建立指向镜的有限元模型，对比三种设计方案。仿真结果表明，方案2在保证面形精度指标前提下，质量由12.8 kg降为10.7 kg（降幅16.4%），一阶固有频率由730 Hz提高至1528 Hz（提升109%），刚度质量比提高1.5倍，性能指标显著优于传统开放结构（方案1）和大孔径方案（方案3）。优化后的指向镜通过了正弦振动试验，面形精度RMS值提高了一倍由0.073 λ提升至0.036 λ（λ=632.8nm）。本研究提出的半封闭背板设计突破了传统轻量化结构的刚度局限，为其他空间反射镜设计提供了新方法。 |
| 中文关键词:碳化硅反射镜 轻量化 半封闭结构 二维指向机构 指向镜 |
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| Optimization Design and Application of Spaceborne Large Aperture SiC Plane Mirror |
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| Abstract:An innovative design scheme based on semi-closed backplane structure was proposed to meet the requirements of lightweight and stiffness improvement of SiC planar mirror in two-dimensional pointing mechanism of space camera. The semi-closed topological configuration on the back was constructed to replace the traditional open structure, and the stiffness was improved by adjusting the size of the process hole. The finite element model was established and the three design schemes were compared. The simulation results showed that the mass of the second scheme was reduced from 12.8 kg to 10.7 kg, the first natural frequency was increased from 730 Hz to 1528 Hz, and the ratio of stiffness to mass was increased by 1.5 times. The performance index was significantly better than that of the traditional open structure (scheme 1) and the large aperture scheme (scheme 3). The optimized pointing mirror had passed the sinusoidal vibration test, and the RMS value of the surface shape accuracy was doubled from 0.073 λ to 0.036 λ (λ = 632.8 nm). The semi-closed backplane design proposed in this study breaks through the stiffness limitation of traditional lightweight structures, and provides a new method for the design of other space mirrors. |
| keywords:SiC mirror Lightweight Semi-closed structure Two-dimensional pointing mechanism Pointing mirror |
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