Measurement and correlation of high frequency behaviors of a very flexible beam undergoing large deformation |
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Authors: | Jae Wook Lee Hyun Woo Kim Hi Chun Ku Wan Suk Yoo |
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Affiliation: | 1. Department of Mechanical Engineering, Pusan National University, Busan, 609-735, Korea 2. School of Mechanical Engineering, Pusan National University, Busan, 609-735, Korea
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Abstract: | A correlation method of high frequency behaviors of a very flexible beam undergoing large displacement is presented. The suggested
method based on the experimental modal analysis leads to more accurate correlation results because it directly uses the modal
parameters of each mode achieved from experiment. First, the modal testing and the parameter identification method are suggested
for flexible multibody dynamics. Due to the flexibility of a very thin beam, traditional testing methods such as impact hammer
or contact type accelerometer are not working well. The suggested measurement with high speed camera, even though the test
beam is very flexible, is working well. Using measurements with a high speed camera, modal properties until the 5th mode are
measured. And After measuring each damping ratio until the 5th mode, a generic damping model is constructed using inverse
modal transformation technique. It’s very interesting that the modal transformation technique can be also applied even in
the ANCF simulation which uses the global displacement and finite slope as the nodal coordinates. The results of experiment
and simulation are compared until the 5th mode frequency, respectively, by using ANCF forced vibration analysis. Through comparison
between numerical simulation and experiment, this study showed that the proposed generic damping matrix, modal testing and
parameter identification method is very proper in flexible multibody dynamic problems undergoing large deformation. |
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