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大型柔性航天结构的一阶频率可能低至0.1 Hz,采用自由悬吊方法进行结构自由状态频响测试难以满足要求,因为它要求悬吊频率远低于待测结构的一阶频率。为解决这一问题,文章研究了弹性边界试验方法: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,通过频域子结构解耦方法,去除支撑结构对待测结构的影响,以得到待测结构自由状态的频响。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。
Large-scale flexible aerospace structures may have a first-order frequency as low as 0.1 Hz, and a free-form frequency response test using the free-suspension method is difficult to meet because it requires that the suspension frequency be well below the first order frequency of the structure under test. In order to solve this problem, the paper studies the elastic boundary test method: applying elastic support to the structure to be tested, removing the influence of the support structure on the structure to be measured after obtaining the frequency response of the whole structure and the support structure respectively, In order to obtain the frequency response of the structure to be tested in a free state. The experimental results show that this method is feasible and can be considered for further application in the actual engineering structure.