4 Replies Latest reply on Dec 18, 2014 3:24 AM by Jared Conway

Nonlinear Arc Length Control warning

Tariq Mehmood Dec 5, 2014 4:15 PM

I have warning notice "negative root in a quadratic equation" while I am solving model under Arc Length Control method. I am still able to get the results without any errors but not quite sure if I can rely on these results because it seems solution time is really short than anticipated. Someone have any idea what's wrong with model?

Re: Nonlinear Arc Length Control warning

Jared Conway Dec 10, 2014 12:53 AM (in response to Tariq Mehmood)

there is a swx kb article on this error message, customerportal.solidworks.com, it also has recommendations on resolving it

basic answer is that the completion parameters may not be set correclty
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- Re: Nonlinear Arc Length Control warning
  
  Tariq Mehmood Dec 10, 2014 12:22 PM (in response to Jared Conway)
  
  Thanks Jared.
  
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  - Re: Nonlinear Arc Length Control warning
    
    Tariq Mehmood Dec 16, 2014 2:00 PM (in response to Tariq Mehmood)
    
    After setting up completion parameters, I'm able to run the study without any warnings/errors but the response graph looks little weird (copy attached). Initially it goes up to load factor 6.17 but finally getting the expected load factor of 4.8. How can I interpret these results?
    
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    - Re: Nonlinear Arc Length Control warning
      
      Jared Conway Dec 18, 2014 3:24 AM (in response to Tariq Mehmood)
      
      not sure, looks weird to me, i'd probably send to support
      
      you might be able to get some more arc steps in there to try and prevent that, thats the only thing i can think of
      
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