nastran manual


Constraints

This section describes all options that the user can find in the menu Constraints


Constraints (Points, Lines, Surfaces)

MENU SEQUENCE:

 


Allows assign prescribed displacements and rotations around global axes.

These conditions can be assigned over points, lines and surfaces, and affect nodes.

X-Constraint->Prescribed displacement along X-global axis

X-Rotation->Prescribed rotation around X-global axis

The prescribed displacements and rotations always make references to global axes.

Enforced Displacements (Points, Lines, Surfaces)

MENU SEQUENCE:

 


Assigns enforced displacements or rotations. The signs convention for components of a vector follows the right hand rule (see figure below).

This condition can be assigned over points, lines and surfaces, and it is attached to nodes of the entity.

Figure 1 – Positive Signs Convention

 

Enforced displacements and rotations always make references to global axes.