/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)

[ m s ] MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaada Wcaaqaaiaab2gaaeaacaqGZbaaaaGaay5waiaaw2faaaaa@39DE@
Vyt Y component in the local frame of the translational velocity.

(Real)

[ m s ] MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaada Wcaaqaaiaab2gaaeaacaqGZbaaaaGaay5waiaaw2faaaaa@39DE@
Vzt Z component in the local frame of the translational velocity.

(Real)

[ m s ] MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaada Wcaaqaaiaab2gaaeaacaqGZbaaaaGaay5waiaaw2faaaaa@39DE@
Vr Rotational velocity about the rotational axis.

(Real)

[ rad s ]

Comments

  1. 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).
  2. The initial nodal velocity is calculated as:(1)
    v ( M ) = V t + V r U U O M
    Where,
    U
    Vector defining the rotation axis.
    O
    Center of the local coordinate system
    M
    Nodal point
    V r
    Rotation velocity
    V t
    Vector of translational velocity
  3. This option cannot be used when /INIVEL/TRA or /INIVEL/ROT is applied on the same node.