Specifies whether the excitation frequency is synchronous or asynchronous with the rotational velocity of a structure.
The ratio between the frequency of excitation and
the frequency of the rotational velocity of the structure. This value
must be greater than 0. The default is an unbalance excitation (
RATIO = 1.0).
The name of the rotating component on which to apply the harmonic excitation.
The SYNCHRO command specifies whether the excitation frequency is synchronous or asynchronous with the rotational velocity of a structure in a harmonic analysis. Use the command to take into account rotating harmonic forces on rotating structures.
Mechanical APDL calculatestes the rotational velocity Ω of the structure
from the excitation frequency f, defined (via the HARFRQ command) as Ω
= 2πf /
RATIO. The rotational velocity is applied along the direction cosines
of the rotation axis (specified via an OMEGA or CMOMEGA command).
Specifying any value for
a general rotational force excitation and not an unbalance force.
To define an unbalance excitation force (F = Ω2 * Unb),
RATIO should be left blank (the
nodal unbalance Unb is specified via the F command).
The SYNCHRO command
is valid only for a full-solution harmonic analysis (HROPT,
Method = FULL) and the Variational Technology
Method = VT) involving a rotating structure (OMEGA or CMOMEGA) with Coriolis enabled in a stationary reference frame (CORIOLIS,,,,
RefFrame = ON).