【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。更多还原

【Abstract】 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.更多还原