How to use multiple load steps in a single optimization run in min compliance design?

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi,

I kind of hit a roadblock in my endeavor to optimize the cabin of my aircraft with crash and level flight case haha.. It's sort of do or die situation here so to say !! I need help in , how to combine two load steps together for minimum compliance design. Both the load cases are linear static.  Both the load steps require separate sets of BCs and load. I tried doing Compliance Index and Weighted Compliance but it's giving me this error

'
 *** ERROR # 1996 *** in the input data:
 All entries have zero scale.'


which I do not understand . I tried to define index multiple times but I am missing something and making some mistakes but I am not sure what? Any help will be highly appreciated. 

 

Thanks !

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi @adi4141

     

    You can use Weighted compliance instead. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Yes I was making a stupid mistake by not assigning weight in the Load collector so technically all the loads were zero. Hence, it was unable to perform any calculation what so ever.

     

    Thank you so much !

  • Dragon_heart
    Dragon_heart Altair Community Member
    edited January 2019

    Hi

     

    Anyone can help in making multiple LOAD STEP.

    For eg. 1. Only Constraint firstly.

    2. then Apply pretension and

    3. apply different loads.

    4. then deload as requirement.

     

     

    Regards,

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited January 2019

    You can refer OptiStruct example guide from online help.We have few example for pretension case. PFA one of it.

    Unable to find an attachment - read this blog

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