/INIVEL/AXIS
Block Format Keyword Initialize both translational and rotational velocities on a group of nodes in a given coordinate system.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/INIVEL/AXIS/inivel_ID/unit_ID | |||||||||
inivel_axis_title | |||||||||
Dir | frame_ID | grnd_ID | |||||||
Vxt | Vyt | Vzt | Vr |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
inivel_ID | Initial velocity block
identifier. (Integer, maximum 10 digits) |
|
unit_ID | Unit Identifier. (Integer, maximum 10 digits) |
|
inivel_axis_title | Initial velocity block
title. (Character, maximum 100 characters) |
|
Dir | Direction X, Y, and Z of
the frame defining the rotation axis. (Text) |
|
frame_ID | Frame identifier.
frame_ID is obligatory input. If not given, the initial velocities are applied with respect to the global coordinate system. (Integer) |
|
grnd_ID | Node group on which
specified initial velocities are applied. (Integer) |
|
Vxt | X component in the local
frame of the translational velocity. (Real) |
|
Vyt | Y component in the local
frame of the translational velocity. (Real) |
|
Vzt | Z component in the local
frame of the translational velocity. (Real) |
|
Vr | Rotational velocity about
the rotational axis. (Real) |
Comments
- The keyword defines initial rigid body type of motion (translational and rotational) of a group of nodes (for example, initial velocity for rollover simulation of a vehicle).
- The initial nodal velocity is
calculated as:
(1) Where,- Vector defining the rotation axis.
- Center of the local coordinate system
- Nodal point
- Rotation velocity
- Vector of translational velocity
- This option cannot be used when /INIVEL/TRA or /INIVEL/ROT is applied on the same node.