How to restart the dynamic analysis in optistruct?

shivaswamy gurusiddaiah_22438
shivaswamy gurusiddaiah_22438 New Altair Community Member
edited August 2021 in Community Q&A

Dear Optistruct user, 

Could someone explain me how can I restart modal frequency response analysis from normal modal analysis in Optistruct?

Many Thanks in advance

Shiva

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Answers

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited August 2021

    There's not exactly a Restart in this case.

    But, you can use the EIGSAVE and EIGRETRIVE commands to store the modal results for a second run.

     

    Model #1

    run modal analysis and request EIGSAVE >> it saves the eigenresults into a external file.

     

    Model #2

    create a FRF model, and request EIGRETRIEVE >> it will use the previously saved result and skip the modal analysis, thus speed-up the FRF run.

  • shivaswamy gurusiddaiah_22438
    shivaswamy gurusiddaiah_22438 New Altair Community Member
    edited August 2021
    Adriano A. Koga_21884 said:

    There's not exactly a Restart in this case.

    But, you can use the EIGSAVE and EIGRETRIVE commands to store the modal results for a second run.

     

    Model #1

    run modal analysis and request EIGSAVE >> it saves the eigenresults into a external file.

     

    Model #2

    create a FRF model, and request EIGRETRIEVE >> it will use the previously saved result and skip the modal analysis, thus speed-up the FRF run.

    Hi Adriano, Thank you for your answer. I have an extended question on random analysis. Is the same approach works for running random analysis from frequency response results (random just statistical calculations and I used to do only within Patran by using FRF results)!? With this I just want to avoid running FRF analysis repeatedly during random iterations. Many thanks in advance for your time Shiva
  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited August 2021
    shivaswamy gurusiddaiah_22438 said:

    Hi Adriano, Thank you for your answer. I have an extended question on random analysis. Is the same approach works for running random analysis from frequency response results (random just statistical calculations and I used to do only within Patran by using FRF results)!? With this I just want to avoid running FRF analysis repeatedly during random iterations. Many thanks in advance for your time Shiva

    Random analysis can be restarted from a previous FRF analysis in newer versions, by using ASSIGN card.

     

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