环形桁架结构模态实验及有限元仿真分析

发布时间：2018-02-05 04:05

本文关键词： 大型可展开天线环形桁架模态实验固有频率　出处：《应用力学学报》2017年01期 　论文类型：期刊论文

【摘要】：针对大型可展开环形桁架天线结构开展了模态实验和有限元仿真分析。首先设计加工了环形桁架实验模型,采用锤击法对自由边界条件下环形桁架结构进行了实验模态分析,得到环形桁架结构的前六阶固有频率及其对应模态振型,并通过模态置信准则对实验结果进行了可靠性分析。其次,建立了环形桁架实验模型的有限元模型并进行模态分析,仿真得到其前六阶固有频率和模态振型。最后详细对比分析了实验结果与有限元仿真结果。结果表明:二者固有频率误差小于5%,且实验模态振型与有限元仿真模态振型一致,证明了本文分析结果真实可靠;同时,分析得到了环形桁架结构第一、二阶振型为椭圆形,第三、四阶振型为三角形,第五、六阶振型为四边形。
[Abstract]:The modal experiment and finite element simulation analysis of large deployable ring truss antenna structure are carried out. Firstly, the experimental model of ring truss is designed and processed. The experimental modal analysis of annular truss structure under free boundary condition is carried out by hammering method, and the first six natural frequencies and corresponding modal modes of annular truss structure are obtained. The reliability of the experimental results is analyzed by the modal confidence criterion. Secondly, the finite element model of the annular truss experimental model is established and the modal analysis is carried out. The first six natural frequencies and modal modes are obtained by simulation. Finally, the experimental results and the finite element simulation results are compared and analyzed in detail. The results show that the error of the two natural frequencies is less than 5%. The experimental modal mode is the same as the finite element simulation modal mode, which proves that the analysis results in this paper are true and reliable. At the same time, the first and second modes of annular truss are elliptical, the third and fourth modes are triangular, the 5th and sixth modes are quadrilateral.
【作者单位】：北京工业大学机械结构非线性振动与强度北京市重点实验室;
【基金】：国家自然科学基金(11290152;11272016) 高等学校博士学科点专项科研基金
【分类号】：TN820
【正文快照】： 随着人类对太空的探索不断深入,人造卫星在航天领域占据了不可或缺的位置[1]。而星载天线是卫星的重要部件,其技术性能对卫星的性能和稳定性具有重要的影响,随着空间科学技术飞速发展,其口径越来越大[2]。可展开空间天线结构在航天器发射过程处于收拢状态,航天器入轨后再展开

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