In the new dynamic Control Parameters can setting mass model LUMPED or CONSISTENT.
What ist the different ?

The "lumped mass model" only contains values on the main diagonal of the elemental mass matrix. In the "consistent mass model" the matrix is fully populated.

With the "lumped mass model" you have to be aware that the accuracy of the solution depends on your mass lumping (node spacing). The "consistent mass model" inherently addresses this issue.

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Ohlinger,

With a lumped mass model , you can expect lower natural frequencies than if you are using a consistent mass model.

Regards