Rigid Motion Suppression
The
Rigid Motion Suppression
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
Rigid Motion Suppression
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:
•
Constraint Reaction Terms
•
Weak Constraints
•
Constraint Settings
•
Rigid Body Motion
in the
Structural Mechanics Modeling
chapter.
•
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
Solid Mechanics>Domain Constraints>Rigid Motion Suppression
Shell>Face Constraints>Rigid Motion Suppression
Plate>Face Constraints>Rigid Motion Suppression
Layered Shell>Face Constraints>Rigid Motion Suppression
Membrane>Face Constraints>Rigid Motion Suppression
Beam>Line Constraints>Rigid Motion Suppression
Multibody Dynamics>Domain Constraints>Rigid Motion Suppression
Ribbon
Physics tab with
Solid Mechanics
or
Multibody Dynamics
selected:
Domains>Domain Constraints>Rigid Motion Suppression
Physics tab with
Shell
or
Membrane
selected:
Boundaries>Face Constraints>Rigid Motion Suppression
Physics tab with
Plate
selected:
Domains>Face Constraints>Rigid Motion Suppression
Physics tab with
Layered Shell
selected:
Boundaries>Face and Domain Constraints>Rigid Motion Suppression
Physics tab with
Beam
or
Truss
selected:
Edges>Line Constraints>Fixed Constraint