Campbell Diagram
Campbell Diagram
(OP)
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 critical speed map because as far as I have tried, I can't seem to model the speed dependent stiffness and damping properties of a fluid film bearing using this software.
Also, is there anyone who is familiar to the SAMCEF software for the ROTOR module? Can this software be used to plot the critical speed map because as far as I have tried, I can't seem to model the speed dependent stiffness and damping properties of a fluid film bearing using this software.





RE: Campbell Diagram
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Dr Michael F Platten
RE: Campbell Diagram
If that's the case, then what is the difference between a campbell diagram and the critical speed map?
RE: Campbell Diagram
One example of what I would call a critical speed map just shows the variation in natural frequency with bearing stiffness and does not relate bearing stiffness to a particular speed.
... But that is just the definition as per the software that I use.
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Dr Michael F Platten
RE: Campbell Diagram
From the papers I read, I understand that the undamped critical speeds may be obtained by superimposing the speed dependent direct stiffness curves on the critical speed map.
I guess I was just confused by the critical speeds obtained in a Campbell Diagram and that from a Critical Speed Map, as I was trying to find the connection between them.
RE: Campbell Diagram
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Dr Michael F Platten