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Real Life Example of a non-symmetric eigenvalue problem

- September 8, 2025 at 1:20 am
  
  Dennis Chen
  Subscriber
  
  Hello, are there really simple example model of a unsymmetric modal analysis that must be solved (suposedly) with the MODOPT, UNSYM command in ansys mechanical?
  I like to build a very simple example demonstrating this capability in Ansys Mechanical and I like to know if there's a simple real life example I can use.
- September 8, 2025 at 6:31 am
  
  ErKo
  Ansys Employee
  
  Hi
  
  Please see this example in help (brake squeal – unsym, modal). As a side no need for commands in modal analysis set.:
  In the Analysis Settings, set the Solver type to Unsymmetric (as mentioned in the below example)
  
  https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/corp/v252/en/wb_wbtec/WBtecbrakeSolution.html
  We also have it as a course/tutorial:
  
  https://innovationspace.ansys.com/courses/courses/understanding-simulations-through-examples-part-2/lessons/break-squeal-analysis-lesson-1/
  All the best
  Erik
- September 14, 2025 at 8:13 pm
  
  Dennis Chen
  Subscriber
  
  Erik, Thank you! I saw the same example in LS-Dyna too!.
  - September 15, 2025 at 7:31 am
    
    ErKo
    Ansys Employee
    
    That is great - I have not seen that one (LS-Dyna) - many thanks,

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