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Vibration analysis of honeycomb sandwich

Vibration analysis of honeycomb sandwich

Vibration analysis of honeycomb sandwich

I am trying to simulate vibration analysis of the honeycomb sandwich (by extracting only surface from sketch)in Ansys. But I can not solve some problem and I will be very glad if somebody can help me by answering following questions:
1.Which analysis should I use: Harmonic, modal or Transient?
2.How can I extract the eigenvalues or eigenvectors from the simulation?
3. I import the surface geometry from Solidworks and solver fails to run by stating that there is no mesh connection between core and skins, how can solve this issue?

Thanks in advance
Look forward to your help

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