Hi All,

We have a set of results where there are pairs of frequencies.  Every natural frequency has a second, not exactly the same frequency.  A quick look at the mode shapes show some differences between the  two sets of results.    Is this an indicator that something wrong?  Perhaps the constraint equations between the twin models.

Run in Ansys15 classic.  I'll be trying to get into the Class 3 error reports to see if there's a program bug related.

Asking for a friend.

Thanks,

Dan Bohlen
Senior Engineer, Stress Analysis
STAR review chairman, collateral structures
GE Aircraft Engines
1 Neumann Way
Evendale, OH  45215  USA

Build B90 Col. H5  cube BK35-251
M/D H358  Cell  513-917-3402

Building 200 Col. G3  cube BC088  Desk Phone 3-8816

"In God we trust, all others bring data." W Edwards Deming

Hi Dan,

If I recall, there was an error on this many years ago in an old version,
which looks like you are running.  I think the issue was with cyclic
symmetry, the duplicate sector wasn't getting the basic sector temperatures
applied to it, so for models with elevated temperatures, the material props
were evaluated at different temperatures between the base sector and
duplicate sector.

Joseph T Metrisin
Structures Lead

Florida Turbine Technologies, Inc
1701 Military Tr. Suite 110 | Jupiter, FL 33458 USA
+1 (561) 427-6346 Office | +1 (772) 834-4156 Mobile
Joe.Metrisin@kratosdefense.com

Visit our website: https://kratosdefense.com

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-----Original Message-----
From: Bohlen, Dan (GE Aviation, US) dan.bohlen@ge.com
Sent: Wednesday, August 10, 2022 8:39 AM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: K, Ashok (GE Aviation) Ashok.KA@ge.com; McCann, Mike (GE Aviation, US)
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Subject: [External] - [Xansys] Cyclic Symmetry Modal Analysis

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Hi All,

We have a set of results where there are pairs of frequencies.  Every
natural frequency has a second, not exactly the same frequency.  A quick
look at the mode shapes show some differences between the  two sets of
results.    Is this an indicator that something wrong?  Perhaps the
constraint equations between the twin models.

Run in Ansys15 classic.  I'll be trying to get into the Class 3 error
reports to see if there's a program bug related.

Asking for a friend.

Thanks,

Dan Bohlen
Senior Engineer, Stress Analysis
STAR review chairman, collateral structures GE Aircraft Engines
1 Neumann Way
Evendale, OH  45215  USA

Build B90 Col. H5  cube BK35-251
M/D H358  Cell  513-917-3402

Building 200 Col. G3  cube BC088  Desk Phone 3-8816

"In God we trust, all others bring data." W Edwards Deming

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