I have two solid parts connected by a spring/damper (each node of the spring/damper ist connected to the part by a rigid RBE3 element). I make this to explore the impact of stiffness and damping on my modal analysis results. But no matter what damping values I use in the spring/damper, it won't have an impact on the frequencies of the modal analysis.
Can anyone help me?
Solved! Go to Solution.
See image below regarding the effect of damping on structures. I have created a single CBUSH with a lumped mass at one end with and constrainted and loaded at the other.
- highest peak is zero damping
-reduced peak is 5% damping
Hope this helps.
Another visual. Damped vs Undamped.
Same natural frequency (distance between peaks).
Recall that the natural frequency is derived from mass (m) and spring rate (k); damping doesn't play a role (which you have confirmed!)
It was my fault, damping has of course no impact on the frequences in modal analysis. In the frequency response analysis you can see the effect though.