空间相机镜筒柔性支撑结构设计与动力学分析  

Structural design and dynamic analysis of the flexible support of body tube in space camera

作　　者：孙德伟[1] 张广玉[1] 王武义[1] 陈志刚[1] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001

出　　处：《机械设计与制造》2010年第10期1-3,共3页Machinery Design & Manufacture

基　　金：国家建设高水平大学资助项目(LJC[2008]3019)

摘　　要：为了减小卫星平台的随机振动对空间相机像质的影响,为空间相机的镜筒设计了一套柔性支撑结构,并对柔性结构的动力学特性进行了深入研究。首先,在镜筒及其支座之间放置2mm厚的橡胶环,使镜筒和支撑之间形成柔性连接。然后,应用参数识别的方法对柔性支撑的迟滞阻尼特性进行分析,得到其刚度系数和阻尼系数随频率变化的公式。最后,使用拉格朗日法建立整个系统的动力学方程,得到镜筒质心位置位移和转角随频率变化的曲线。动力学分析结果表明:当振动频率大于663Hz时,位移传递率小于0.6;当频率大于974Hz时,转角变化范围在(0.046～0.050)°之间;满足设计要求。柔性支撑结构对高频振动抑制效果显著,可以为空间相机提供一个稳定的工作环境。In order to reduce random vibration impact to image quality of space camera from satellite,a flexible support structure for the body tube of space camera is designed and a kinetic analysis is conducted to study its dynamic characteristic.Firstly,The two millimeter thick rubber ring is put into the gap between the body tube and supporter,so as to form a flexible support between two objects.Then,the hysteresis damping character of the flexible support is analyzed using the method of parameter identification,acquiring the equations that stiffness coefficient and damping coefficient changing with frequency.Finally,dynamic equations of the system are established by Lagrangian method and the curves of displacement and angle in the centroid of body tube changing with frequency are obtained.Dynamic analysis results indicate that displacement transmissibility ratio in the centroid is less than 0.6 after 663Hz;The angle of centroid changes from 0.046° to 0.050° after 974Hz.It has been satisfied the design requirement.The flexible support can effectively isolate the vibration in high frequency and provide a stable working environment for space camera.

关 键 词：空间相机 柔性支撑 参数识别 动力学分析 振动抑制 

分 类 号：TH113.1[机械工程—机械设计及理论] V441.1[航空宇航科学与技术—飞行器设计]