TINTP, GAMMA, ALPHA, DELTA, THETA, OSLM, TOL, --, --, AVSMOOTH, ALPHAF, ALPHAM
Defines transient integration parameters.
GAMMAAmplitude decay factor for 2nd order transient integration,
e.g., structural dynamics (used only if ALPHA, DELTA, ALPHAF, and ALPHAM are blank). Defaults to
0.005.
ALPHA2nd order transient integration parameter (used only
if GAMMA is blank). Defaults to 0.2525.
DELTA2nd order transient integration parameter (used only
if GAMMA is blank). Defaults to 0.5050.
THETA1st order transient (for example, thermal transient) integration parameter. Defaults to 1.0.
OSLMSpecifies the oscillation limit criterion for automatic
time stepping of 1st order transients (e.g., thermal transients).
Defaults to 0.5 with a tolerance of TOL.
TOLTolerance applied to OSLM. Defaults to 0.0.
--, --Unused fields.
AVSMOOTHSmoothing flag option:
0 | — | Include smoothing of the velocity (1st order system) or the acceleration (2nd order system) (default). |
1 | — | Do not include smoothing. |
ALPHAFInterpolation factor in HHT algorithm for force and
damping terms (used only if GAMMA is blank).
Defaults to 0.005.
ALPHAMInterpolation factor in HHT algorithm for inertial
term (used only if GAMMA is blank). Defaults
to 0.0.
Used to define the transient integration parameters. For more information on transient integration parameters, refer to the Mechanical APDL Theory Reference.
For structural transient analyses, you may choose between the
Newmark and HHT time integration methods (see the TRNOPT command). In this case, if GAMMA is input
and the integration parameters ALPHA, DELTA, ALPHAF, and ALPHAM are left blank, the program will calculate the
integration parameters. Alternatively, you can input these integration
parameters directly on this command. However, for the unconditional
stability and second order accuracy of the time integration, these
parameters should satisfy a specific relationship, as described in Description of Structural and Other Second Order Systems of the Mechanical APDL Theory Reference.
In a transient piezoelectric analysis, required input for this
command is ALPHA = 0.25, DELTA = 0.5, and THETA = 0.5. For a coupled
electromagnetic-circuit transient analysis, use THETA = 1.0, the default value, to specify the backward Euler method.
This command is also valid in PREP7.