I have peformed different form for input/output relation to determine a system, but seem to be missing some theory which input will be the most will excite enough modes such that the models which i end up with will be accurate..
I tried Impulse response, step response and sine sweep.
Could somebody provide me with some litterature which explains discusses these method, and which one will create an accurate result. I feel like the sinesweep is more accurate, most because it has excited all the modes/configuration of the system, and the impulse and step haven't seem to be doing so.. but still litterature would be appriaciated.