What causes a warning about unprocessed component while postprocessing a cyclic symmetry solution in Mechanical APDL?
Tagged: apdl, unprocessed component


June 6, 2022 at 9:57 amFAQParticipant
After /CYCEXPAND,,OFF (or if no /CYCEXPAND has been issued), the following warning message is issued (may be PRNSOL, PRESOL or other):
*** WARNING ***
PRNSOL is listing an unprocessed component of a cyclic symmetry
solution. It can combine all appropriate components to produce the
actual nodal solution for sectors 1 through 6 if cyclic expansion
(/CYCEXPAND) and PowerGraphics (/GRAPH) are both active.Various commands (*GET, *VGET, …) gives you the unprocessed results but not as real and imaginary part but as real values for original and duplicate sector, so if you have n nodes in the sector, you need to get results for both nodes ii and ii+n
NODE UZ
24 83.275
120 190.35To compute expanded results, User need eq.32 (Mechanical APDL > Cyclic Symmetry Analysis Guide >Cyclic Symmetry Overview > Postprocessing a Cyclic Symmetry > Using the /CYCEXPAND Command)
The amplitude can be retrieve from the unprocessed results AMP = SQRT(UA^2+UB^2). A phase sweep can also be performed (as with CYCPHASE command) by adding a Cyclic Phase angle to both cos and sin terms in eq.32.
Extra precaution has to be observed when dealing with noncomponent results (USUM, SEQV, SINT) or linearized stress, component results need to be obtained with eq.32 before computing noncomponent results: combining noncomponent results with eq.32 for basic and duplicated sector is not correct.In addition, and for modal results only, expanded results are normalized with respect to the full mass matrix (N * [M]), while unprocessed results are normalized to the cyclic mass matrix (2 * [M], except if k = 0 or N/2, where 1 * [M]) (N = number of sectors, [M] = mass matrix of the original sector), so that we have to multiply the above results by SQRT(2/N) (or SQRT(1/N) if k = 0 or N/2).
With /CYCEPAND,,ON or within Workbench Mechanical, expanded results can be plotted (Maximum Over Cyclic Phase, Cyclic Phase of Maximum, Cyclic Phase)

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