Rigid Motion Suppression

The node adds a minimum number of constraints required to suppress any rigid body modes. The constraints are selected so that there will be no reaction forces if the external loads are self-equilibrating.

The constraint will, depending on physics interface and geometrical dimension, be applied to one, two, or three points as needed. These points are automatically picked from the selected geometrical objects.

This feature must not be combined with any other types of constraints, such as prescribed displacements or symmetry conditions.

If you need to constrain several objects which are not physically connected, you must add as many nodes as there are disconnected objects.

Shell Properties.


	This section is only present in the in the Layered Shell interface, where it is described in the documentation for the Rigid Motion Suppression node.

In the COMSOL Multiphysics Reference Manual:

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Constraint Reaction Terms

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Weak Constraints

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Constraint Settings

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Rigid Body Motion in the Structural Mechanics Modeling chapter.

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Rigid Motion Suppression Boundary Condition in the Structural Mechanics Theory chapter.


	You can activate and deactivate this boundary condition by assigning it to a constraint group. See Load Cases in the Structural Mechanics Modeling chapter.

Location in User Interface

Context Menus

Ribbon

Physics tab with or selected:

Physics tab with selected:

Physics tab with or selected: