大型空间相机光机结构稳定性关键技术研究

For large-scale TMA optical system cameras, the distortion of the structure caused by mechanical or temperature environment directly affects the imaging quality. To research on stability of the optomechanical structure suffers multiple loadcases or coupling effect of spaceborne, technologies about prestress analysis and abstract modeling of compliant structures are proposed. To evaluate the stability of optomechanical structure under multiple loadcases, the prestress analysis based on residual vector algorithm to compensate the displacement of the mirror is proposed. To solve the thermal stress coupling effect of spaceborne suffers large temperature gradients and complex temperature loads, the local abstract modeling of compliant structure is proposed. To realize vibration isolation over a wide frequency range under conditions of high frequency modal intensive and high modal coupling, the method of vibration transmissibility of compliant structures is proposed. At last, the key technologies to evaluate the optomechanical stability of the 2m scale optical camera will be built which provides the theoretical support for structural design of large-scale space camera or optical platform to achieve the international advanced level and acquire the core technologies with independent intellectual property rights.

对于大型离轴三反光学系统相机，力学环境和温度环境等因素造成的相机光机结构变形直接影响相机成像质量。本申请提出预应力分析和柔顺结构抽象建模两个新方法，开展多工况、星载耦合效应作用下相机光机结构稳定性研究。提出残余矢量算法补偿镜面节点位移的预应力分析，进行多工况转换下相机光机结构稳定性的评估。提出基于局部抽象建模的柔顺结构构型特征研究，解决大温度梯度、复杂温度载荷卫星与相机间热应力耦合效应。提出柔顺结构的振动传递性研究方案，实现低频模态密集和模态耦合程度高条件下宽频率范围振动抑制。最终形成2m口径可见光相机光机结构稳定性关键技术，为我国的大型空间相机/光学平台光机结构设计迈向国际先进水平提供理论支持和拥有自主知识产权的核心技术。

对于大型离轴三反光学系统相机，力学环境和温度环境等因素造成的相机光机结构变形直接影响相机成像质量。本项研究面向国家大型高分辨空间相机设计需求，研究约束条件变化、大温度梯度复杂温度载荷、低频模态密集和模态耦合程度高等环境的空间相机光机结构稳定性关键技术。具体研究内容与成果包括：1）不同约束工况条件下光机结构稳定性评价方法，实现装调检测研制过程链路分析；2）大温度梯度复杂温度载荷星载热适应柔性结构设计理论与方法，实现提升相机在轨温度环境适应性；3）在轨微振动环境的相机视轴指向评价与优化方法，实现降低相机视轴指向总均方根加速度。

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