大型柔性结构自由频响地面试验方法  

Ground free-free FRFs test method for large flexible structure

作　　者：王栋[1] 刘丽坤[2] 周志成[2] 郑钢铁[1] 

机构地区：[1]清华大学航天航空学院,北京100084 [2]中国空间技术研究院通信卫星事业部,北京100094

出　　处：《强度与环境》2012年第6期1-7,共7页Structure & Environment Engineering

基　　金：装备预研基金(9140A20020610HT0506)资助项目

摘　　要：因诸如大型可展开天线等大型柔性空间结构的基频很低,很难通过现在广泛应用的低频悬吊方法来模拟其自由状态。为得到这类结构的自由频响,研究了一种方法:对待测结构施加弹性支撑,在分别获得整体与支撑结构频响后,通过后续处理去除支撑结构对待测结构的影响,进而得到待测结构自由状态的频响。数值与试验结果表明,这一方法是可行的,可以考虑进一步应用于实际工程结构。In this paper, we present a method to cope with the problem existing in ground free-free large flexible structure modal tests. As the first natural frequency of a large flexible structure, such as a large deployable antenna, is often very low, it is difficult, even impossible to use currently widely applied low frequency suspension method. In this paper, an alternative approach is taken, the structure is supported with a group of supports with certain stiffness. After FRFs tests of the whole supported system and the supports respectively, the influence of the supports can be removed from a later computation, so the free-free FRFs can be obtained. Both numerical and experimental examples are described in this paper .

关 键 词：地面试验 弹性约束 自由频响 

分 类 号：O32[理学—一般力学与力学基础]