/VEL/TRA
Engine Keyword Given node numbers have the same velocity in a specified direction X, Y or Z for material translational DOF.
Format
/VEL/TRA/Keyword3/skew_ID
N_{1} N_{2}... N_{N}
Definitions
Data  Description  SI Unit Example 

Keyword3  A combination of
X, v, and
Z: X, Y, Z, XY, XZ, YZ, YX, ZX, ZY, XYZ, YXZ, ... 

skew_ID  Skew identifier
(optional). If omitted, the equation is written in the global skew system; otherwise it is applied in the given skew_ID. 

N_{1} N_{2} ... N_{N}  List of node numbers having the same velocity. 
Comments
 Given node numbers have the same
velocity in a specified direction X, Y or Z for material translational DOF (Rigid
links):
(1) $${\text{V}}_{\text{X}}=\frac{\sum _{\text{j}=1}^{\text{N}}{\text{M}}_{\text{J}}{\text{V}}_{\text{x}}^{\text{j}}}{\sum _{\text{j}=1}^{\text{N}}{\text{M}}_{\text{J}}}$$