Frequency Response Optimization

mesun_20785
mesun_20785 Altair Community Member
edited October 2020 in Community Q&A

Hi all;

 

I performed related tutorial and i would like to kindly ask about frf-displacement response

 

there are sum sub options related with that..such as rss,ssq can anyone give me details of those suboptions?

 

I want to minimizie displacement of my plate like structure for the first 3 modes..targeting volume constrained of one layer of this plate..

 

Does ssq or rss works for this purposes? As fara as i searched they are related with sum of squares of ( applicable for first 3 modes ? ) arguments etc..

 

Any idea?

 

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2015

    Hi Mesun,

     

    Please find the attached image about SSQ and RSS from OptiStruct help:

    <?xml version="1.0" encoding="UTF-8"?>post-7616-0-89091300-1434967635_thumb.jp

  • mesun_20785
    mesun_20785 Altair Community Member
    edited June 2015

    Hi;

    Thank you..I am tryin gto use those options in my frequency response analysis.

    I would like to kindly ask you to give me support in solution of folowing problem...I am having some error information from optistruct..

     

    Currently i tried to build my direct frequency response analysis model ( simple cantilever beam model) used tool/unit freq response .. way and performed the analysis...It worked fine ..

     

    Then i tried to build my topology optimization step having some nodal displacements as frf displacement response.

    and also colume fraction of my design space as constraint.

     

    When i choose objection function as min frf-disp under loadcase of Direct Frequency Response Analysis i had an error ( attached)

     

    Then tried to use same methodology given in OS 2095 tutorial like having frf-disp as constrained with UB value and when i select again the load step as DFRA again had same error( Attached)

     

    <?xml version="1.0" encoding="UTF-8"?>post-36201-0-22400000-1434972848_thumb.j

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2015

    Hi,

     

    Please try with min volume as objective & frf displacement as design constraint or any other recommended formulation attached in thumbnail.

    I have attached thumbnail for commonly and suggested formulation for topology optimization mentioned Optistruct FAQ. Refer  Optistruct user guide for detailed information.

     

    Regards

    Rahul R

    <?xml version="1.0" encoding="UTF-8"?>post-36845-0-23399700-1435037662_thumb.j

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