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Frequency response dynamic stiffness

ArulUser: "Arul"
Altair Community Member
Updated by Arul

Hi ,

 

Can anyone explain how to calculate / Plot dynamic stiffness from frequency response analysis in Optistruct?

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    Hi,

     

    Double Integrate Acceleration to get the Displacement and inverse of that displacement divided by input force will give dynamic stiffness.

     

    You may need to load the preference file using File > Load > Preference File > Vehicle Safety Tools > Load.

     

    Once you load this, click on Math > One Curve > Double Integral and select the Acceleration curve to get the Displacement curve.

    ArulUser: "Arul"
    Altair Community Member
    OP
    Updated by Arul

    Thank you

    Dear both,
    I know this is fairly old, but I have a question:
    When I do dynamic stiffness, I do FRF analysis.
    So, I get results in frequency domain.
    In frequency domain, the integral is calculated by multiplication/division with the radial frequency.

    Therefore:
    Displacement over frequency is calculated from acceleration as:
    u(f)=a(f)/(2*pi()*f)²