qrdopt

Mapdl.qrdopt(reusekey='', symmeth='', cmccoutkey='', **kwargs)

Specifies additional QRDAMP modal analysis options.

APDL Command: QRDOPT

Parameters:

reusekey

Reuse key for method=QRDAMP specified in MODOPT command.

ON

Reuse the symmetric eigensolution from the previous load steps or from the previous solution.

OFF

Do not reuse (calculates symmetric eigensolution at current load step). This is the default.

symmeth

Mode-extraction method to be used for the symmetric eigenvalue problem.

LANB

Block Lanczos (default for shared-memory parallel processing).

SUBSP

Subspace algorithm (default for distributed-memory parallel processing).

cmccoutkey

Complex Modal Contribution Coefficients (CMCC) output key. See Calculate the Complex Mode Contribution Coefficients (CMCC) in the Structural Analysis Guide for details and usage.

ON

Output the CMCC to the text file Jobname.CMCC.

OFF

Do not output the CMCC. This is the default.

Notes

If the filename.modesym file exists in the working directory and ReuseKey = ON, filename.modesym will be reused. If filename.modesym does not exist in the working directory, the symmetric eigensolution will be calculated.

When ReuseKey=ON, both the new modal analysis (filename.modesym usage) and the preceding modal analysis (filename.modesym generation) must be performed using the same product version number.

The mode-extraction method changes depending on the type of parallelism involved. For performance reasons, the subspace method is used with distributed-memory parallel processing (Distributed ANSYS) runs, while the Block Lanczos method is used with shared-memory parallel processing runs.