/RLINK
Block Format Keyword Defines a rigid link. The rigid link imposes the same velocity on all the secondary nodes in one or more directions.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/RLINK/rlink_ID | |||||||||
rlink_title | |||||||||
Trarot | Skew_ID frame_ID | grnod_ID | Ipol |
Definition
Field | Contents | SI Unit Example |
---|---|---|
rlink_ID | Rigid link
integer. (Integer, maximum 10 digits) |
|
rlink_title | Rigid link
title. (Character, maximum 100 characters) |
|
Trarot | Codes for translation and rotation.
(6 Booleans) |
|
Skew_ID / frame_ID | Frame identifier for
Ipol=0 or frame identifier
for Ipol=1. 3 If Skew_ID ≠ 0: the code refers to this local skew (or frame) identifier. If Skew_ID = 0: the code refers to the global coordinate system. (Integer) |
|
grnod_ID | Secondary nodes group
identifier. (Integer) |
|
Ipol | Polar rigid link flag.
3
(Integer) |
Codes for Translation and Rotation: input format for the first field (1) Trarot
If Ipol = 0
(1)-1 | (1)-2 | (1)-3 | (1)-4 first boolean | (1)-5 second boolean | (1)-6 third boolean | (1)-7 | (1)-8 fourth boolean | (1)-9 fifth boolean | (1)-10 sixth boolean |
---|---|---|---|---|---|---|---|---|---|
TX | TY | TZ |
If Ipol = 1
(1)-1 | (1)-2 | (1)-3 | (1)-4 first boolean | (1)-5 second boolean | (1)-6 third boolean | (1)-7 | (1)-8 fourth boolean | (1)-9 fifth boolean | (1)-10 sixth boolean |
---|---|---|---|---|---|---|---|---|---|
Trad | Taxial | Ttang |
Definition
Field | Contents | SI Unit Example |
---|---|---|
TX | Code for translation along
X-axis.
(Boolean) |
|
TY | Code for translation along
Y-axis.
(Boolean) |
|
TZ | Code for translation along
Z-axis.
(Boolean) |
|
Code for rotation around
X-axis.
(Boolean) |
||
Code for rotation around
Y-axis.
(Boolean) |
||
Code for rotation around
Z-axis.
(Boolean) |
||
Trad | Code for translation in
radial direction.
(Boolean) |
|
Taxial | Code for translation in
axial direction.
(Boolean) |
|
Ttang | Code for translation in
tangential direction.
(Boolean) |
|
Code for rotation in
radial direction
(Boolean) |
||
Code for rotation in axial
direction.
(Boolean) |
||
Code for rotation in
tangential direction.
(Boolean) |
Comments
- The velocity is computed using momentum
conservation equations. However, no global momentum equilibrium is respected.
- For translational DOF:
- For rotational DOF:
- For translational DOF:
- Input format details for Trarot are shown above. The six individual boolean codes (one per direction) must be right justified in the 10 character fields used by the Trarot variables.
- If Ipol
=1, polar coordinate system is used;
frame_ID definition is compulsory. In this case, not only
direction of the axis is set, but also the position of the center of the polar
coordinate system.
- The first boolean code corresponds to the radial direction effect
- The second boolean code corresponds to the axial effect
- The third boolean corresponds to the tangential effect
- Axial direction is defined by the X direction of the frame
- Radial direction is orthogonal to axial direction and is passing through concerned node
- Tangential direction is orthogonal to axial and radial directions