tintp

Mapdl.tintp(gamma='', alpha='', delta='', theta='', oslm='', tol='', avsmooth='', alphaf='', alpham='', **kwargs)

Defines transient integration parameters.

APDL Command: TINTP

Parameters
  • gamma – Amplitude 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.

  • alpha – 2nd order transient integration parameter (used only if GAMMA is blank). Defaults to 0.2525.

  • delta – 2nd order transient integration parameter (used only if GAMMA is blank). Defaults to 0.5050.

  • theta – 1st order transient (e.g., thermal transient) integration parameter. Defaults to 1.0.

  • oslm – Specifies 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.

  • tol – Tolerance applied to OSLM. Defaults to 0.0.

  • avsmooth

    Smoothing flag option:

    0 - Include smoothing of the velocity (1st order system)

    or the acceleration (2nd order system) (default).

    1 - Do not include smoothing.

  • alphaf – Interpolation factor in HHT algorithm for force and damping terms (used only if GAMMA is blank). Defaults to 0.005.

  • alpham – Interpolation factor in HHT algorithm for inertial term (used only if GAMMA is blank). Defaults to 0.0.

Notes

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.