Fabrice Silva <silva <at> lma.cnrs-mrs.fr> writes:
This transfer function involves an integrator (leading to the slope after the transient) and a first-order low-pass filter (leading to a damped contribution, the transient).
IMHO, the step_response.png file is more probably correct than the TA1.jpg file, as there is no second-order term that would possibly lead to the oscillation shown in the latter. Moreover, the action of the integrator for a step response can not lead to a constant steady state. Am I wrong?
Looking at the fonts, I believe the step_response.png file comes from matplotlib, and then from your python script. What makes you sure the matlab script is correct?
The integrator is used to reduce the overall error of the response so that it reaches the constant steady state 1. The low-pass is used to reduce the overshoot caused by the integrator. If i didn't get it wrong in the control engineering class. Probably have to check the notes again and run thru the MATLAB script again. The response of TA1.jpg was made during a Lab (control engineering) at University and the Prof checked it.