exo3.py

Created by raph-couvert

Created on June 13, 2023

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sk = 0, 2sk1 + 0, 1sk2 + 0, 5ek1
Calculer la fonction de transfert G(z) du système et la valeur de la sortie à 
linfini si lentrée est un échelon
damplitude 2.
Par transformée en z, la relation de récurrence devient :

S(z) = 0,2z^(1)S(z)+0,1z(2)S(z)+0,5z^(1)E(z)
S(z)(10,2z^(1)0, 1z(2)) = (0, 5z^(1))E(z)

on en déduit :
G(z) = S(z)/E(z)
     =0, 5z^(1) / 10,2z^(1)0, 1z^(2)

La valeur à linfini de la sortie se calcule avec le théorème de la valeur finale :
s(inf) = lim z->1 de (1  z^(1))S(z)
   = lim z->1 de (1  z^(1))G(z)E(z)
   = lim z->1 de (z1/z)(0,5z^(1)/10,2z^(1)0,1z^(2))(2z/z1)
s(inf) = 2(0, 5/10,20,1)
s(inf) = 1, 429

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