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I see...it is one of the requirement of my final year project, that i plot a critical speed map of the centrifugal compressor, however, the FEM software i am using doesn't seem to be able to do just that! From the papers I read, I understand that the undamped critical speeds may be obtained by...

thanks for your reply. If that's the case, then what is the difference between a campbell diagram and the critical speed map?

I would like to ask, for a Campbell Diagram, are the natural frequencies plotted in the diagram corresponds to a bearing of constant stiffness and damping properties? Also, is there anyone who is familiar to the SAMCEF software for the ROTOR module? Can this software be used to plot the...