**ICROTATE**, * NODE*,

`OMEGA`

`X1`

`Y1`

`Z1`

`X2`

`Y2`

`Z2`

`Vx`

`Vy`

`Vz`

Compatible Products: – | Pro | Premium | Enterprise | Ent PP | Ent Solver | –

`NODE`

Node at which the initial velocity is to be specified. If ALL, apply to all selected nodes (

**NSEL**). A component name may be input for.`NODE`

`OMEGA`

Scalar rotational velocity about the rotational axis.

,`X1`

,`Y1`

`Z1`

Coordinates (in the global Cartesian coordinate system) of the beginning point of the rotational axis vector.

,`X2`

,`Y2`

`Z2`

Coordinates (in the global Cartesian coordinate system) of the end point of the rotational axis vector.

`Vx`

Initial translational velocity in direction x of the nodal coordinate system.

`Vy`

Initial translational velocity in direction y of the nodal coordinate system.

`Vz`

Initial translational velocity in direction z of the nodal coordinate system.

The **ICROTATE** command specifies initial velocity
for all translational degrees of freedom of the specified nodes. The
velocity value is a combination of velocity due to rotation about
an axis and translation. The velocity at the node is calculated as:

where

v^{
N
} =
velocity of node in the nodal coordinate
system`N` |

v^{trans} = translational velocity
input as [, `Vx` , `Vy` ]`Vz` |

ω = scalar angular velocity input as `OMEGA` |

x^{1} and x^{2} denote the coordinates of points prescribing the beginning [, `X1` , `Y1` ] and end [`Z1` , `X2` , `Y2` ] of the rotation axis`Z2` |

x^{
N
} denotes
the coordinates of node `N` |

All coordinates are input in the global Cartesian coordinate system, and the velocity due to rotation is then converted to the nodal coordinate system and added to the prescribed translation.

The **ICROTATE** command is valid only for static
analysis and full method transient analysis (**TIMINT**,ON with
**TRNOPT**,FULL). The initial value is specified at the beginning of the first
load step; that is, at time = 0.0.

The command calculates the nodal velocities and saves them in
the database as if the **IC** command had been used
to calculate these velocities. Thus, when the **Jobname.CDB** or **Jobname.DB** file is written, the velocities
prescribed by the **ICROTATE** command appear as **IC** commands. All assumptions, recommendations, and restrictions
for the **IC** command are also true for the **ICROTATE** command.

This command is also valid in PREP7.