基于加速度各向同性的空间光学仪器主动隔振Stewart平台设计  

Optimal design of an acceleration isotropy-based active vibration isolation Stewart platform for spaceborne optical instrument

作　　者：佟志忠[1] 段广仁[2] 何景峰[1] 姜洪洲[1] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨1500010 [2]哈尔滨工业大学航天学院,哈尔滨1500010

出　　处：《振动与冲击》2012年第2期109-114,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(50975055)

摘　　要：为保证高精度空间光学仪器的仪器精度,采用主动隔振Stewart平台作为多维振动隔离系统。基于加速度各向同性定义,考虑负载的质量几何特性,推导了加速度各向同性的解析数学表达式,揭示了各向同性、机构结构以及负载特性之间的联系,给出了柔顺中心的数学表达式以及各向同性Stewart平台的特征不变量。为降低系统非线性及耦合影响,提出以运动正交、加速度各向同性为指标的主动隔振Stewart平台设计,建立了生成一类加速度各向同性隔振Stewart平台的设计方法。To ensure high accuracy spaceborne optical instruments with natural precision,a Stewart platform was adopted as a multi-dimensional active vibration isolation system.Considering mass geometry characteristics of payload,the analytical formulation of acceleration isotropy was derived based on the definition of acceleration isotropy.The relations among the acceleration isotropy,the mechanism architecture and the characteristics of the payload were found.The mathe-matical expression of the compliant center was also deduced analytically.An invariable measure of an isotropy Stewart platform was given.The optimal design using motion orthogonality and acceleration isotropy was proposed to reduce nonlinear and coupling effects,and a routine was established to generate a class of active vibration isolation Stewart platforms with acceleration isotropy.

关 键 词：各向同性 STEWART平台 主动隔振 优化设计 空间光学仪器 

分 类 号：TP535[自动化与计算机技术]