空间卫星相机安装固定基频性能优化设计
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摘要
某空间卫星相机在多次迭代优化后基频仍然未满足技术要求,为解决相机整机基频偏低,易与卫星平台发生共振的问题,提出了更改相机安装固定位置为整机Z向质心平面处的解决方法。首先建立空间相机振动模型,通过对底部和中部两种安装结构等效模型的理论计算,找到提高相机基频的方法;其次,进行有限元仿真确定提高整机基频的理想位置,并根据仿真分析结果,优化设计了相机Z向中心平面处和Z向质心平面处两种安装方案;最后,采用有限元分析软件MSC/Patran对两种安装方案进行仿真分析对比。经分析确定,质心平面处安装方案基频较高,同时反射镜精度仍满足设计要求,整机重量相比初始设计有所下降。结果表明,提出的质心平面处安装方案提高了整机基频,保持了反射镜精度,同时还部分降低了整机的重量,证明了结构设计和理论分析的合理性。
The fundamental frequency of a space satellite camera still cannot meet the technical requirements after several iterations of optimization. In order to solve the problem that it is easy for lower fundamental frequency to resonate with the satellite platform, a new solution which changes the fixed position to the centroid of camera is put forward. Firstly, the vibration model of the space camera was set up, and the method improving the fundamental frequency of the camera was found through the theoretical calculation of the equivalent model of two kinds of installation structures in the bottom and the middle. Secondly, finite element simulation was carried out to improve the ideal position of the fundamental frequency of the whole machine, and two installation schemes of Z to the center and Z to the centroid of camera were optimized, according to the simulation results. Finally, the simulation analysis and comparison of two installation schemes were carried out with finite element analysis software MSC/Patran. After analysis, the fundamental frequency of the scheme fixed in centroid is highest, while the mirror accuracy still meets the design requirements, and the weight of the whole camera is lower than the initial design. The results show that the scheme fixed in centroid plane of camera not only improves the basic frequency of the whole machine and keeps the accuracy of the reflector, but also partially reduces the weight of the camera, which verifies the rationality of the structural design and theoretical analysis.
The fundamental frequency of a space satellite camera still cannot meet the technical requirements after several iterations of optimization. In order to solve the problem that it is easy for lower fundamental frequency to resonate with the satellite platform, a new solution which changes the fixed position to the centroid of camera is put forward. Firstly, the vibration model of the space camera was set up, and the method improving the fundamental frequency of the camera was found through the theoretical calculation of the equivalent model of two kinds of installation structures in the bottom and the middle. Secondly, finite element simulation was carried out to improve the ideal position of the fundamental frequency of the whole machine, and two installation schemes of Z to the center and Z to the centroid of camera were optimized, according to the simulation results. Finally, the simulation analysis and comparison of two installation schemes were carried out with finite element analysis software MSC/Patran. After analysis, the fundamental frequency of the scheme fixed in centroid is highest, while the mirror accuracy still meets the design requirements, and the weight of the whole camera is lower than the initial design. The results show that the scheme fixed in centroid plane of camera not only improves the basic frequency of the whole machine and keeps the accuracy of the reflector, but also partially reduces the weight of the camera, which verifies the rationality of the structural design and theoretical analysis.
引文
[1] 魏磊.长焦距宽视场空间相机主支撑结构优化设计与研究[D].中国科学院大学,2017.
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[2] 李林,等.空间相机柔性减震支撑结构的优化设计[J].光学精密工程,2016,24(7):1677-1684.
[3] 张舸,赵文兴.轻型反射镜镜体结构参数的分析[J].光学精密工程,2006,14(1):48-53.
[4] E J Knight,G Kvaran.Landsat-8 operational land imager design,characteriation and performance[J].Remote Sensing,2014,6(11):10286-10305.
[5] 王建永,等.国外高分辨率相机与卫星平台连接方式综述[J].航天返回与遥感,2009,30(4):36-41.
[6] 沙巍,等.离轴三反空间相机与卫星平台的优化连接方式[J].红外与激光工程,2015,44(5):1527-1533.
[7] 张军强,董得义,颜昌翔.空间成像光谱仪的主体支撑方式[J].光学精密工程,2009,17(10):2451-2455.
[8] 李延伟,等.某TMA遥感器桁架支撑结构动态特性研究[J].计算机仿真,2010,27(9):20-23.
[9] 贺帅,等.球铰支撑反射镜面形仿真分析[J].计算机仿真,2014,31(2):302-306.
[10] 张义民.机械振动[M].北京:清华大学出版社,2007.