Select or remove modes to analyze in Response Dynamics

By default, the Response Dynamics solution process includes all modes Simcenter Nastran calculated in the solution. You can reduce the modal model by deactivating insignificant modes in the event. Typically, you deactivate the modes that have the smallest mass values in the direction of interest. You can also simulate the effects of a stiffer structure by removing very compliant modes. Only active modes will be used in the response event.

1. In the Simulation Navigator, locate the node for your Response Dynamics solution process (indicated with the icon).

2. Under the Modal Representations node, select Normal Modes.

3. In the list of modes that appears in the Details panel at the bottom of the Simulation Navigator, select the modes to exclude. Use the Ctrl or Shift keys to select multiple modes. An asterisk (*) appears next to each active normal mode.

4. Right-click the selected modes and choose Deactivate.

5. You can also deactivate modes using a mass limit. For more information see Deactivate modes by mass limit in Response Dynamics.

Note:

To reactivate all modes, choose Activate All.

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Create a Response Dynamics solution process

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Check validity of mode shapes

Clear the obsolete status of a Response Dynamics solution process

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CBUSH element force in Response Dynamics

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Related Topics

Deactivate modes by mass limit in Response Dynamics

Select or remove modes to analyze in Response Dynamics, Simcenter 3D 2021.1 Series

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