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Modal Frequency Response Analysis (SOL111) with subcases: same constraints but different loads. How to make so that Modes are calculated only once?

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In Patran how to define frequency response for a model for which there are different acceleration load in input (defined in different subcases) but always the same constraints (one specific node fixed)?
 
In particular, how to make so that the modes calculated within the frequency response analysis are calculated only once for all the different load cases?
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  • 0
    This is a nastran question. Nastran restart capability can be used. SOL 103 restarted into SOL 111.
     
    Modes will not be calculated as long as METHOD/EIGRL entries is same, SPC is same.
  • 0 in reply to Hrishikesh Phadke

    Thank you for the feedback  ,

    How can I create an analysis deck in Patran where the same SPC (ID) is used across multiple subcases?

    In the Analysis module (Analyze > Entire Model > Analysis Deck > Subcase Select), when I select different subcases that contain different loads but the same SPCs, I notice in the generated .bdf file that the subcases use the same METHOD and different DLOAD, but the SPC IDs are different.

    Even though these SPCs constrain the same DOFs for the same nodes, their IDs are different. Based on your feedback, I expect this would cause the solver to calculate the modes separately for each subcase.

    Is there a way to ensure that the same SPC ID is used for all subcases to avoid redundant calculations?

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  • 0 in reply to Hrishikesh Phadke

    Thank you for the feedback  ,

    How can I create an analysis deck in Patran where the same SPC (ID) is used across multiple subcases?

    In the Analysis module (Analyze > Entire Model > Analysis Deck > Subcase Select), when I select different subcases that contain different loads but the same SPCs, I notice in the generated .bdf file that the subcases use the same METHOD and different DLOAD, but the SPC IDs are different.

    Even though these SPCs constrain the same DOFs for the same nodes, their IDs are different. Based on your feedback, I expect this would cause the solver to calculate the modes separately for each subcase.

    Is there a way to ensure that the same SPC ID is used for all subcases to avoid redundant calculations?

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