Gain and phase margin + phase and gain crossover frequeny results
15 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I used this code to find phase and gain margin. Also to find phase and gain crossover frequeny
syms s
G = tf([7 14],[1 10 24])
[Gm,Pm,Wcg,Wcp]=margin(G)
grid on
but I got this result. can any one explain to me why Gm and Pm = Inf and Wcg and Wcp= NaN?
and what is maning of Inf and Nan?
G =
7 s + 14
---------------
s^2 + 10 s + 24
Continuous-time transfer function.
Gm =
Inf
Pm =
Inf
Wcg =
NaN
Wcp =
NaN
0 commentaires
Réponses (2)
Keerthana Chiruvolu
le 8 Déc 2020
Hi,
Firstly, NaN means Not A Number and inf is infinite.
From the bode plot of the transfer function, we can observe that the Magnitude plot doesn’t cross 0. And the phase is not 180° at any frequency.
Wcp - 0-dB gain crossing frequency.
Wcg -180° phase crossing frequency
To calculate the gain and phase margins we require the crossover frequencies. Hence, the result for Wcp , Wcg is NaN and Gm, Pm are inf.
1 commentaire
Kingsley Osubor
le 17 Août 2021
How can we explain a bode diagram with Gm with Infinity, Pm with infinity, Wcg with infinity and Wcg with not a number value.
0 commentaires
Voir également
Catégories
En savoir plus sur Stability Analysis dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!