In time response, how do we know the validirty of a second-order step-response approximation is valid or not valid? and y?
n how can we know if it is write in transfer function form, n time domain form? please help me, thanks!
I think the most practical thing to do is to compare the step response of the actual system to the theoretical response of the proposed transfer function. Or derive a bode plot of the actual system and compare it to the theoretical bode plot, etc.
Hi. When a function is in frequency domain usually is expressed: N(s)/D(s) where N(s) and D(s) are in polynomial form.
The question about the aproximation is not clear. All systems are modelled as an aproximation. This is possible cause exist some dominant poles in the transfer function.