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systèmeautomatisé:systèmequiréalisedemanièreautonome,uncertainnbd'opérations. L'interventionhumaineestlimitéàlaprogrammation,lamiseenmarcheetlesréglagesdeparamètredusystème.systèmeasservi:systèmedanslequelunegrandeurphysiqueestcontraintedesuivreuneévolutiondonné,qqlsoientlesperturbations2familles:systèmerégulateur:consigned'entrée fixe
système suiveur : consigne d'entréevarieentréetype=entréethéoriqueimpulsionoudirac:sit<0out>T0:e(t)=0si0<=t<=T0:e(t)=1/T0Echelonunitaire:sit<0:e(t)=u(t)=0sit>=0:e(t)=1Echelond'amplitude a :
e(t)=au(t)
Rampe de pente b :
e(t)=btu(t)
sinusoïde :
e(t)= E sin(wt) u(t)
un système asservi doit être :
stable, rapide, précis, amorti
erreur statique (e(t)=au(t)):
epsilon,s= lim (e-s)(t)
relative = epsilon,s / a
erreur de trainage (e(t)=btu(t)):
epsilon,t= lim (e-s)(t)
transorfmé de la place :
passer du domaine temporel au domaine de la place
L(f'(t))=pF(p)-f(0+)L(f''(t))=p**2*F(p)-pf(0+)-f'(0+)
L(dirac(t))=1
L(Ku(t))=K/p
L(Ktu(t))= K/p**2
L(exp(-at)*u(t))=1/(p+a)
si les CI sont nul, on peut écrire S(p)=H(p)*E(p)
système linéaire continu et invariant
forme canonique de H :
H(p)= K(1+Ap+...+Zp**m/ p**a (1+A'p+...+Z'p**(n-a))
a=classe du système
K=gain statique
n= ordre du système
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