Thread: Help: Variable gain in Matlab

I want to plot the step response for the following transfer function for variable gain controller (ka) (say a loop 20:20:100) :

5Ka
----------------
s^2 + 20 s + 5Ka

Now I want matlab to detect that for which values of Ka the response is underdamped or overdamped or critical damped. Is it possible?

Plz help.

Originally Posted by ruzfactor

I want to plot the step response for the following transfer function for variable gain controller (ka) (say a loop 20:20:100) :

5Ka
----------------
s^2 + 20 s + 5Ka

Now I want matlab to detect that for which values of Ka the response is underdamped or overdamped or critical damped. Is it possible?

Plz help.

Do you know how to compute the step response for this?

RonL