- Mapdl.qdval(tblno1='', tblno2='', sv1='', sv2='', sv3='', sv4='', sv5='', sv6='', sv7='', **kwargs)¶
Defines PSD quadspectral values.
APDL Command: QDVAL
First input PSD table number associated with this spectrum.
Second input PSD table number associated with this spectrum.
- sv1, sv2, sv3, … , sv7
PSD quadspectral values corresponding to the frequency points [PSDFRQ].
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.