[SciPy-User] Wrong Step Response

Fabrice Silva silva@lma.cnrs-mrs...
Wed May 23 05:16:05 CDT 2012

> 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.

Are you sure you are not confusing the step response of a transfer
function with the step response of a looped system containing an
integrator ?

Once you close the loop, the global transfer function is not the one you
mentionned but
H = G/(1+G)
for a unity feedback (for example), which exhibits the oscillation and
the unity steady state.

What you did in your control engineering classes may be the closed-loop
Fabrice Silva

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