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