What is SDM?

The Structural Dynamics Modifications (SDM) method calculates the effects of making physical modifications to a structure on its modes of vibration.

 With SDM, physical elements can be added to (or subtracted from) a structure model, and its new modes are calculated.

The modes of the unmodified structure must be a set of mode shapes scaled to Unit Modal Masses (a modal model).

Structural Dynamics Modification (SDM) Calculation Diagram