StepInfo Outputting NaN for my Transfer Function
17 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
I am trying to find the overshoot of a transfer function for a step response but the stepinfo command does not display anything useful. This is the code.
sys=tf(280*[1 1.5 .5], [100 215 30.5 1 0]);
stepinfo(sys)
ans =
RiseTime: NaN
SettlingTime: NaN
SettlingMin: NaN
SettlingMax: NaN
Overshoot: NaN
Undershoot: NaN
Peak: Inf
PeakTime: Inf
0 Commenti
Risposte (2)
Craig
il 18 Nov 2011
Hi Omar,
The system you specified has an integrator and is therefore unstable. This is the reason why NaN's are being returned by stepinfo.
You can see the response by doing
>> step(sys)
-craig
1 Commento
Fangjun Jiang
il 19 Nov 2011
That is the point of my answer. It needs to run step() first to get the step response and then run stepinfo() using the step response as the input.
The existence of an integrator in the system increases the chance of making the system stable. It's usually the derivative that makes the system un-stable.
Vedere anche
Categorie
Scopri di più su Stability Analysis in Help Center e File Exchange
Prodotti
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!