I have an issue where "Commenting Through" a Simulink block semmingly changes the response of an unrelated system.
Say I have unrelated sys A and sys B. Exactly what they are aren't as relevant for now (I think).
The top sys A is off-screen at the connection, but is independent of the bottom sys B. A's output plotted is called "y LQGI_DOB intl err".
The bottom sys B is shown in entirety, so is independent of anything else.
They both have an inline filter (5e5 / ...).
The left-most shared input is from essentially a signal generator, eg assume it's a sin-wave. It's a one-directional source that has nothing to do with any outputs in the system.
Here's the response: (note the peak of ~2e4)
Then comment through the filter of sys A like so -- nothing else changed:
And here's the response: (note the peak value for BOTH outputs is ~3e3)
Here's both responses together just for comparison: green/blue is both filters in, red/yellow is one filter commented through.
How is it possible for a self-contained sys B's output to be impacted by a change to sys A? What might be going on?
