CAJ | 학술논문

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.
인제여대형가전개천선등대형유성공간결구적기빈흔저,흔난통과현재엄범응용적저빈현조방법래모의기자유상태.위득도저류결구적자유빈향,연구료일충방법:대대측결구시가탄성지탱,재분별획득정체여지탱결구빈향후,통과후속처리거제지탱결구대대측결구적영향,진이득도대측결구자유상태적빈향.수치여시험결과표명,저일방법시가행적,가이고필진일보응용우실제공정결구.
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.