qdval

Mapdl.qdval(tblno1='', tblno2='', sv1='', sv2='', sv3='', sv4='', sv5='', sv6='', sv7='', **kwargs)

Defines PSD quadspectral values.

APDL Command: QDVAL

Parameters
  • tblno1 – First input PSD table number associated with this spectrum.

  • tblno2 – Second input PSD table number associated with this spectrum.

  • sv1 – PSD quadspectral values corresponding to the frequency points [PSDFRQ].

  • sv2 – PSD quadspectral values corresponding to the frequency points [PSDFRQ].

  • sv3 – PSD quadspectral values corresponding to the frequency points [PSDFRQ].

  • . () – PSD quadspectral values corresponding to the frequency points [PSDFRQ].

  • sv7 – PSD quadspectral values corresponding to the frequency points [PSDFRQ].

Notes

Defines PSD quadspectral values to be associated with the previously defined frequency points. Repeat QDVAL command with the same table number for additional points. Unlike autospectra [PSDVAL], the quadspectra can be positive or negative. The quadspectral curve segment where there is a sign change is interpolated linearly (the rest of the curve segments use log-log interpolation). For better accuracy, choose as small a curve segment as possible wherever a sign change occurs.

Two table numbers are required since values are off-diagonal terms. This command is valid for SPOPT,PSD only.

This command is also valid in PREP7.

Distributed ANSYS Restriction: This command is not supported in Distributed ANSYS.