航天相机等效试验模型的研制

为了检验空间遥感相机的动力学特性,需要对相机与飞船进行动力学耦合试验。为了确保相机的试验安全性,拟首先采用相机的试验模型进行动力学耦合试验,这就带来了相机试验模型的设计问题。通过对空间遥感相机的力学分析,提出了对相机试验模型的力学特性要求。利用UnigraphicII软件实现了模型与原型的质量等效, 并通过分析相机几何参数对相机与飞船耦合模态的灵敏度,采用经典理论解析分析法和固有频率优化法,实现了对试验模型与原型的刚度等效,使得试验模型与飞船的耦合振动和相机与飞船的耦合振动相似。该试验模型的成功研制方法,将对类似的动力学耦合试验起到一定的参考作用

A Study on Equivalent Test Model of a Space Camera

In order to verify the dynamics characteristic of a space remote sensing camera, spacecraft and camera dynamics coupling test is needed. To improve the reliability of the camera, a coupling test should be carried out with a test model instead of the camera. So a test model of camera must be studied at first. Dynamics analysis of the space remote sensing camera was carried out at first, and then the demand for dynamics characteristics of the camera's test model was put forward. The mass equivalence between test model and camera is realized with UnigraphicII software in this paper. Based on the sensitivity analysis of structural parameters of camera with respect to each mode of spacecraft and camera coupling system, stiffness equivalence was realized with classical theoretical analysis and natural frequency optimization. The dynamics coupling test between spacecraft and test model was similar to the test between spacecraft and camera. The method to develop a test model applied in this paper will be a reference to some other dynamics coupling test.