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The effects of stingers on measured FRFs

机译:毒刺对测得的FRF的影响

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When using a shaker to conduct a modal test, the dynamic characteristic of the shaker become combinedrnwith those of the test structure. It is common practice to install a long slender element between the testrnstructure and the shaker to minimise the effects of the shaker on the measured FRFs. This is called a stinger,rnpushrod or drive rod. The selection of stingers is generally made by trial-and-error, by chance or experience.rnIn this paper the effects of stingers on the measurement is investigated. A new model is made which can bernused for the prediction of this unwanted bias error. The proposed model was successfully validated by thernexperimental results.
机译:当使用振动筛进行模态测试时,振动筛的动态特性会与测试结构的动态特性相结合。通常的做法是在测试结构和振动筛之间安装一个细长的元件,以使振动筛对测得的FRF的影响最小。这称为毒刺,推杆或驱动杆。选针器通常是通过反复试验,偶然或经验来选择的。本文研究了测针器对测量的影响。制作了一个新模型,该模型可用于预测此不希望有的偏差。实验结果成功验证了所提模型的有效性。

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