Why does my acceleration signal from simscape looks so weird?

Can someone help me out?

Why does my acceleration signal look like this? Why isn't it a smooth line?

Is it somewhere in the setting? Did i chose a wrong solver?

The signal is from a transform sensor from Simscape.

Answer 1

[Martin]

Hi Rik,

Numerical derivatives are inherently noisy, and subject to spikes due to time step differences, jumps in the solution, etc. You may want to filter the signal being differentiated. In Simulinik, a straightforward way to do a first-order filter is to use a transfer function block with 1/(tau*s + 1) where tau is the filtering time constant.

Martin

[Rik Bakker]

Thanks Martin!