ansys.mapdl.core.Mapdl.harfrq#

Mapdl.harfrq(freqb='', freqe='', logopt='', freqarr='', toler='', **kwargs)#

Defines the frequency range in a harmonic analysis.

Mechanical APDL Command: HARFRQ

Parameters:
freqbstr

Frequency (Hz) at the beginning of the FREQB to FREQE range (if FREQE > FREQB ). If FREQE is blank, the solution is done only at frequency FREQB (the central frequency of octave bands, when LogOpt = OB1, OB2, OB3, OB6, OB12 or OB24).

freqestr

Frequency at end of this range. For non-logarithm spacing ( LogOpt is blank), solutions are done at an interval of ( FREQE - FREQB ) / NSBSTP, ending at FREQE, and no solution is done at the beginning of the frequency range, FREQB. NSBSTP is input via the nsubst command. See the expsol command documentation for expansion pass solutions.

logoptstr

Logarithm frequency span. Solutions are done at an interval of (log( FREQE ) - log( FREQB )) / ( NSBSTP -1), ( NSBSTP >1). The central frequency or beginning frequency is used for NSBSTP = 1. Valid values are:

  • OB1 - Octave band.

  • OB2 - 1/2 octave band.

  • OB3 - 1/3 octave band.

  • OB6 - 1/6 octave band.

  • OB12 - 1/12 octave band.

  • OB24 - 1/24 octave band.

  • LOG - General logarithm frequency span.

freqarrstr

An array containing frequency values (Hz). Combined with the tolerance argument, Toler, these values are merged with values calculated based on the specifications from FREQB, FREQE, and LogOpt, as well NSBSTP on the nsubst command and Clust on the hrout command. Enclose the array name in percent (%) signs (for example, harfrq,,,,,%arrname%). Use dim to define the array.

tolerstr

Tolerance to determine if a user input frequency value in FREQARR is a duplicate and can be ignored. Two frequency values are considered duplicates if their difference is less than the frequency range multiplied by the tolerance. The default value is 1 x 10 -5.

Notes

Defines the frequency range for loads in the harmonic analysis ( antype,HARMIC).

Do not use this command for a harmonic ocean wave analysis ( hrocean ).

When frequencies are user-defined, the array FREQARR must be one-dimensional and contain positive values. User-defined frequency input is not supported when the frequency-sweep method is used ( hropt,VT ).

This command is also valid in PREP7.