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Shaft response when rotating at critical speed

Question asked by Alessandro Tornincasa on Feb 9, 2016


would like to simulate shaft response when it's rotating at critical speed.

A frequency analysis will give you mode shapes and associated frequencies:


Now suppose you want to know shaft displacement when roating at a speed coinciding with resonant frequency.

You could do this by creating a harmonic analysis.


I've tried to prescribe a uniform base excitation in the form of rotating speed, therefore I've selected a cylindrical face in order to switch to a cylindrical cordinate system and prescibe a tangential velocity. When doing this simulation issues this error:



How could you find out displacement when shaft rotates at a speed coinciding with resonant frequency given that the only known info is rotating speed ?


I'm attaching the shaft with frequency and dynamic study for your reference.