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Rayleigh damping: how to match the model frequences to the frequences of the measurements?

 I hope that the mecanicians can help me to solve my problem.

 Is there any possibility to match the frequences of the physical model to the mesurement data?

The model of a three-dimentional damped elastic body is excited by a external sinus force that can be measured. The real displacement of this body is also measured. I try to adapt the model to the measurements by using an optimization algorithm that reducces the difference between the model responce and measurements. However the result of the adaptation has the other frequencies as a measurement data. I've read that the damping coefficients of the model can be computed using modal analysis. How i can get the modes of the measurements? Every point of the elastic body swings with the different frequency? How I can match the modes of the measurement data and my model together? 

 

Thank you very much in advance.

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