Structural Dynamics Modification
If a noise or vibration problem is due to the excitation of a resonance, the structure must either be isolated from its excitation sources or physically modified to reduce its vibration response levels. With this option, you can quickly investigate the effects of structural modifications on the modes of a structure. The new modes can then be used in MIMO calculations to determine the effect of structural modifications on overall vibration levels. SDM models structural modifications using industry-standard FEA elements. The FEA element library includes the same elements used by the Experimental FEA option. All modification elements are displayed on the 3D structure model. Each element type has its own spreadsheet, where its properties can be viewed and edited. SDM works with either analytical (FEA) modes or experimental modes of the unmodified structure. Because the new modes of the structure are calculated so quickly, SDM can be used for Modal Sensitivity studies, where thousands of solutions are calculated and ranked for comparison. SDM also includes a special command for adding tuned vibration absorbers to a structure.