Checking for unintentional grounding and mass reduction

You can use the Rigid Body Checks modeling object to check the motion grounding and mass reduction of rigid bodies in your solution.

Note:

If you include a Rigid Body Checks modeling object in your solution, you must use the Nastran sparse solver.

In the Rigid Body Checks dialog box, you can:

• Use the Grounding Check options to evaluate selected DOF sets and identify unintentional constraints and ill-conditioning in the stiffness matrix. The options on the Grounding Check tab correspond to the describers for the Nastran GROUNDCHECK case control command.

• Use the Mass Reduction Check options to compute the rigid body mass at each stage of the mass matrix reduction and compare it with the rigid body mass of the g-set. The options on the Mass Reduction Check tab correspond to the describers for the Nastran WEIGHTCHECK case control command.

Where do I find it?

Application	Pre/Post
Prerequisite	An active Simulation file with Simcenter Nastran, MSC Nastran, or Simcenter 3D Multiphysics as the specified solver
Command Finder	Modeling Objects →Type list→Rigid Body Checks
Menu	Insert→Modeling Objects→Type list→Rigid Body Checks

Learn more

Specifying Nastran GEOMCHECK options

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Checking for unintentional grounding and mass reduction, Simcenter 3D 2021.1 Series

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