Non-linear modal analysis

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

Hi everyone,

 

I am currently trying to perform a modal analysis of a component AFTER it has been loaded with a force. During the loading step, some parts of the component engage in SLIDE type contact. 

I use OPTISTRUCT.
I currently plan to make two loadsteps for the analysis:

1.A non-linear quasistatic step during which I load my model and contacts are engaged

2.A normal modes analysis which should compute the modes for the deformed structure obtained after step1

 

Is this possible in Optistruct?

 

Thanks in advance for any answer.

 

Regards

Matteo

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2018

    Hi @Matteo

     

    Please use STASUB (PRELOAD) in Normal modes subcase which should reference the NLSTAT subcase. 

     

    I think this should help.

  • Nachiket Kadu_22143
    Nachiket Kadu_22143 Altair Community Member
    edited June 2018
    Altair Forum User said:

    Hi @Matteo

     

    Please use STASUB (PRELOAD) in Normal modes subcase which should reference the NLSTAT subcase. 

     

    I think this should help.

    Hi  @Prakash Pagadala

    I am trying this but it comes with error 'Case Control data LOAD=3 is not referenced by any bulk data relevant for used subcase type.' I have attached files for your reference. Kindly help with this.

     

     

  • Nachiket Kadu_22143
    Nachiket Kadu_22143 Altair Community Member
    edited June 2018

    Hi @Prakash Pagadala

    Sorry!! Couldnt see the obvious mistake there. Issue is resolved. :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited June 2018

    Hi Nachiket,

    Try removing the dummy load referred by the static load case. else provide the load for the load collector 3.

  • Nachiket Kadu_22143
    Nachiket Kadu_22143 Altair Community Member
    edited June 2018
    Altair Forum User said:

    Hi Nachiket,

    Try removing the dummy load referred by the static load case. else provide the load for the load collector 3.

    Hi Kathic

    I already resolved it. Thanks anyways!!

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018
    Altair Forum User said:

    Sorry!! Couldnt see the obvious mistake there. Issue is resolved. :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20'>

    ;)/emoticons/default_wink.png' srcset='/emoticons/wink@2x.png 2x' title=';)' width='20'> 

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