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[calvinmooney03]

Hi everyone,

I am trying to model a transmission tower in ansys, and when I try to solve to get the results for my solution I get the following warnings/errors:

"Skipped beams with length of zero."

"One or more parts were found to be unmodified so smart updated."

"Solver pivot warnings or errors have been encountered during the solution.  This is usually a result of an ill conditioned matrix possibly due to unreasonable material properties, an under constrained model, or contact related issues.  Check results carefully."

Only the last warning is affecting my solution results, what might I be able to do to fix this? I have looked at other posts on the forum and they have not been working for me. I have left a link below to access the project if anyone wants to have a look.

Thanks.

https://atlantictu-my.sharepoint.com/:u:/r/personal/g00391348_atu_ie/Documents/Year%204/Major%20Project/Third%20Transmission%20Tower%20Design.wbpz?csf=1&web=1&e=XZAigd

[Sahil Sura]

Hello Calvin!
Considering the warnings/errors, I would recommend you validate the geometry first! As there might be a presence of some underdefined beams.
Solver pivot error to make you understand simply is the solution which has resulted in to singular matrix i.e., it may have many solutions (not unique) or is indeterminate.
There might be several reasons for this, 
Underdefined material - Like improper density, material properties, etc. (Maybe in this case)
Underdefined geometry (Maybe in this case)
Improper constraints - Over or under constraints 
Underdefined Contacts
Buckling (Maybe in this case) - Structure is deforming up to the extent of giving a non-unique solution.

How to deal with this issue -
Check and verify the above-mentioned points or if you're getting the apt result and post-processing is an issue, turn off the solver pivot from 'Solution' or Lapse the solver pivot checking using the command (PIVCHECK, OFF - PIVCHECK (ansys.com) )

References - 

5.9. Singular Matrices (ansys.com)
Search Ansys Documentation

A solver pivot warning or error has been detected (ansys.com)

Error: Solver pivot warnings or errors have been encountered during the solution (ansys.com)

 

Hope this helps!

Thanks,

Sahil

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