空间微振动模拟平台优化  

Optimization of spatial micro-vibration simulation platform

作　　者：徐振邦[1,3] 朱德勇 贺帅 申军立[1] 赵亮[1,2] 夏明一 XU Zhen-bang;ZHU De-yong;HE Shuai;SHEN Jun-li;ZHAO Liang;XIA Ming-yi(Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;University of Chinese Academy of Sciences, Beijing 100049, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049 [3]中国科学院大学材料与光电研究中心,北京100049

出　　处：《光学精密工程》2019年第12期2590-2601,共12页Optics and Precision Engineering

基　　金：中国科学院科研装备研制项目（No.Y89534Y）

摘　　要：为了解决在轨光学载荷地面试验振源模拟难的问题,设计了一种基于并联机构的多维微振动模拟平台,能够有效复现空间微振动分布频率宽、振动量级小的特点。首先,利用虚功原理和牛顿-欧拉方程推导了系统固有频率解析式,并结合设计指标进行构型优化。然后根据最优构型进行结构设计和优化,使得平台固有频率满足5~250 Hz的模拟带宽。最后,提出了一种基于传递函数的控制方法,验证了其正确性并对平台工作能力进行了求解。平台第6阶基频3.4 Hz,第7阶基频356 Hz,满足带宽要求;通过传递函数控制得到的输出与目标值之间最大误差为1.54%,说明该方法适用于平台的控制;上平台输出最大平动加速度为399.3 mg,最大角度扰动为1979.3μrad,满足指标要求。该平台具有模拟带宽大、高承载、振动量级小的特点,能够作为空间微振动地面试验振源模拟设备。In order to solve the problem of in-orbit optical load ground test vibration source simulation,a multi-dimensional micro-vibration simulation platform based on a parallel mechanism was designed,which can effectively reproduce the characteristics of spatial micro-vibration distribution frequencies and small vibration levels.Firstly,the virtual frequency principle and the Newton-Eulerian equation were used to derive the analytical formula for the natural frequency of the system.This was combined with the design index to optimize the configuration,and the structural design was configured based on this,so that the natural frequency satisfied the analog bandwidth of 5-250 Hz.Finally,a control method based on transfer function was proposed,which verified its correctness and solved the working ability of the platform.The fundamental frequency corresponding to the sixth stage of the platform was observed to be 3.4 Hz,and the fundamental frequency corresponding to the seventh order was observed to be 356 Hz,which satisfied the bandwidth requirement.The maximum error between the output and the target value obtained via the transfer function control is 1.54%,which indicates that the method is suitable for platform control.The maximum translational acceleration of the upper platform is observed to be 399.3 mg,and the maximum angular disturbance is detected to be 1979.3μrad,which meets the requirements of the index.The platform exhibits large analog bandwidth,high load capacity,and small vibration levels.It can be used as space micro-vibration ground test vibration source simulation equipment.

关 键 词：空间微振动 固有频率 构型优化 传递函数 

分 类 号：V423.6[航空宇航科学与技术—飞行器设计]