Why is an unbalanced rotordynamics load with SYNCHRO on solid elements wrong? The customer has a 3D solid model on which he is performing a harmonic analysis with the SYNCHRO command. He notes that changing the rotational velocity value on the CMOMEGA command changes his results when for this analysis type, CMOMEGA input is documented to only be used for defining the axis of rotation.

This is an error reported in defect 62620 and corrected in 12.0. For solid elements, the CMOMEGA input in SYNCHRO analysis is being used as a centrifugal force and not as a specification of the rotational axis as documented. The only workaround is to do multiple load steps with the centrifugal force re-specified for each load. The SYNCHRO command cannot be used with solid elements at 11.0.

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