September 22, 2021 at 11:06 pm

peteroznewman

Subscriber

Small angles around the motion of the point don't make much difference. Even if the coordinate axis is the worst it can be, like 45 degrees, there is only a small reduction in peak amplitude.

Mathematically, I can simulate a single DOF mass-spring-damper system with 4% damping and a 7 Hz natural frequency with a plot like this:

You can see that a 7 Hz natural frequency lasts longer than 0.2 seconds compared with a 90 Hz natural frequency. If your model decays much faster than this, then perhaps the model needs further adjustment.

Mathematically, I can simulate a single DOF mass-spring-damper system with 4% damping and a 7 Hz natural frequency with a plot like this:

You can see that a 7 Hz natural frequency lasts longer than 0.2 seconds compared with a 90 Hz natural frequency. If your model decays much faster than this, then perhaps the model needs further adjustment.