Mechanical APDL Basic Analysis Guide - Ansys

Chapter 7:The General Postprocessor (POST1)
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Only the mapped nodes will contribute to the MAC calculations.
Important notes:
• Nodes that are coincident may lead to erroneous interpolation. For example, this can occur in the case
of spring/mass systems attached to solid elements.
• If nodes and/or elements are selected (using the NSEL and/or ESEL commands), the results of the
mapping and/or the interpolation will show differences.
• If the OUTRES command is used to reduce the solution data written on the first results file (File1),
the interpolation may be incorrect. For example, this can occur when an element does not have all its
nodes in the results file. It is recommended that you use the OUTRES command only when generating
the second results file (File2). This option is not supported when comparing cyclic symmetric structure
results.
7.4.8.3. Evaluate MAC Between Solutions at Matched/Mapped Nodes
The Modal Assurance Criterion printout for interpolated solutions (mapped nodes) is as follows:
****** Modal Assurance Criterion (MAC) VALUES ******
Solutions are real
Rows: 10 substeps in load step 1 interpolated from file tsolid.rst
Columns: 10 substeps in load step 1 from file tbeam.rst
1 2 3 4 5 6 7 8 9 10
1 1.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
2 0.000 1.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
3 0.000 0.000 1.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
4 0.000 0.000 0.000 1.000 0.000 0.000 0.000 0.000 0.000 0.000
5 0.000 0.000 0.000 0.000 1.000 0.000 0.000 0.000 0.000 0.000
6 0.000 0.000 0.000 0.000 0.000 1.000 0.000 0.000 0.000 0.000
7 0.000 0.000 0.000 0.000 0.000 0.000 1.000 0.000 0.000 0.000
8 0.000 0.000 0.000 0.000 0.000 0.000 0.000 1.000 0.000 0.000
9 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 1.000 0.000
10 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 1.000
7.4.8.4. Match the Solutions
The Matched Solutions printout for interpolated solutions (mapped nodes) is as follows:
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********************************** MATCHED SOLUTIONS **********************************
Substep in Substep in MAC value Frequency Frequency
tsolid.rst tbeam.rst difference (Hz) error (%)
(interpolated)
1 1 1.000 0.10E-01 0.2
2 2 1.000 -0.47E-02 0.1
3 3 1.000 0.26E-01 0.2
4 4 1.000 0.27E-01 0.1
5 5 1.000 0.40E-01 0.1
6 6 1.000 0.13E+00 0.2
7 7 1.000 0.11E+00 0.2
8 8 1.000 0.82E-01 0.1
9 9 1.000 -0.12E+00 0.1
10 10 1.000 -0.96E+00 0.6
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