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彈性邊界試驗(yàn)獲取自由狀態(tài)頻響方法研究

Extraction of free body frequency response functions from elastically constrained test

  • 摘要: 大型柔性航天結(jié)構(gòu)的一階頻率可能低至0.1 Hz，采用自由懸吊方法進(jìn)行結(jié)構(gòu)自由狀態(tài)頻響測(cè)試難以滿足要求，因?yàn)樗髴业躅l率遠(yuǎn)低于待測(cè)結(jié)構(gòu)的一階頻率。為解決這一問(wèn)題，文章研究了彈性邊界試驗(yàn)方法：對(duì)待測(cè)結(jié)構(gòu)施加彈性支撐，在分別獲得整體與支撐結(jié)構(gòu)頻響后，通過(guò)頻域子結(jié)構(gòu)解耦方法，去除支撐結(jié)構(gòu)對(duì)待測(cè)結(jié)構(gòu)的影響，以得到待測(cè)結(jié)構(gòu)自由狀態(tài)的頻響。試驗(yàn)結(jié)果表明，這一方法是可行的，可以考慮進(jìn)一步應(yīng)用于實(shí)際工程結(jié)構(gòu)。

     

    Abstract: A large scale structure might have a very low first natural frequency, as low as 0.1 Hz. Traditionally, the method of the low stiffness suspension is a standard method for the modal test of structures. A requirement on the suspension stiffness is that the suspension frequency should be much lower than the first flexible natural frequency of the tested structure. For the large scale structure, a very long suspension spring is required to achieve the required frequency. This low frequency requirement might not be able to be met in many labs. In this paper, a method is proposed to deal with the above problem by replacing the low stiffness suspension with a group of supports that can have any stiffness. By removing the influence of the support stiffness from the computation with the measured frequency responses, the structure’s real modal parameters can be obtained conveniently. Experimental examples are given.

     

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