THÈSE DE DOCTORAT Ecole Doctorale « Sciences et ...
THÈSE DE DOCTORAT Ecole Doctorale « Sciences et ...
THÈSE DE DOCTORAT Ecole Doctorale « Sciences et ...
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Annexe D. Théorèmes du p<strong>et</strong>it gain pour des systèmes paramétrés 217<br />
vérifient :<br />
|ω 1 (x 1 (t))| ≤ max { β 1 (|ω 1 (x 1 (t 0 ))|,t − t 0 ),γ ωa 2<br />
1 (τ,‖ωa 2 (x 2)‖ [t0 ,t)),<br />
γ ωb 2<br />
1 (τ,‖ωb 2(x 2 )‖ [t0 ,t)),γ u 1 (τ, ‖u 1 ‖ [t0 ,t) )} (D.159)<br />
|x 1 (t)| ≤ max { α 1 (|x 1 (t 0 )|),η ω 1<br />
1 (τ, ‖ω 1(x 1 )‖ [t0 ,t) ),ηωa 2<br />
1 (τ,‖ωa 2 (x 2)‖ [t0 ,t)),<br />
η ωb 2<br />
1 (τ,‖ωb 2(x 2 )‖ [t0 ,t)),η u 1 (τ, ‖u 1 ‖ [t0 ,t) )} , (D.160)<br />
pour tout x 2 (t 0 ) ∈ R nx 2 , (x 1 ,u 2 ) ∈ L nx 1 +nu 2<br />
∞ , τ ∈ [υ,¯τ), <strong>et</strong> t ≥ t 0 ≥ 0, les solutions de (D.125)<br />
vérifient :<br />
|ω a 2 (x 2(t))| ≤ max { β 2 (|ω 2 (x 2 (t 0 ))|,t − t 0 ),γ ω 1<br />
2 (‖ω 1(x 1 )‖ [t0 ,t) ),γu 2 (‖u 2‖ [t0 ,t) )} (D.161)<br />
|ω b 2(x 2 (t))| ≤ max { α 2 (|ω b 2(x 2 (t 0 ))|),η ω 1<br />
2 (‖ω 1(x 1 )‖ [t0 ,t) ),ηωa 2<br />
2 (‖ωa 2(x 2 )‖ [t0 ,t)),<br />
η u 2 (‖u 2‖ [t0 ,t) )} ,<br />
(D.162)<br />
<strong>et</strong>, pour tout ∆,ε ∈ R >0 , soit M ∈ R >0 (suffisamment grand) <strong>et</strong> m ∈ R >0 (suffisamment<br />
p<strong>et</strong>it) tels que<br />
{<br />
δ m (¯τ,m) < ε<br />
max { m,˜σ m (¯τ,m),ν x (¯τ,∆),ν u (¯τ,∆) } < M,<br />
où, pour (τ,s) ∈ [υ,¯τ) × R ≥0 :<br />
δ m (τ,s) = max { η˜σ m (τ,s),ηs }<br />
{<br />
ν x (τ,s) = max β 1 (ρ 1 (s),0),γ ωa 2<br />
1 (τ,β 2(ρ 2 (s),0)),γ ωb 2<br />
1 (τ,α 2(ρ 2 (s))),<br />
ν u (τ,s) = max<br />
γ ωb 2<br />
1 (τ,ηωa 2<br />
2 (β 2(ρ 2 (s),0))),β 2 (ρ 2 (s),0),γ ω 1<br />
2 (β 1(ρ 1 (s),0)),<br />
γ ω 1<br />
2 (γωb 2<br />
1 (τ,α 2(ρ 2 (s)))),ρ 1 (s),ρ 2 (s), ˜β(s,0),˜σ<br />
}<br />
x (τ,s)<br />
{<br />
γ ωa 2<br />
1 (τ,γu 2 (s)),γ1 u (τ,s),γ ωb 2<br />
1 (τ,ηωa 2<br />
2 (γu 2 (s))),γ ωb 2<br />
1 (τ,ηu 2 (s)),<br />
γ ω 1<br />
2 (γu 1 (τ,s)),γu 2 (s),γω 1<br />
2 (γωb 2<br />
1 (τ,ηu 2 (s))),˜γu (τ,s)<br />
}<br />
,<br />
(D.163)<br />
avec η > 1, ˜σ m ∈ KK, ˜β ∈ KL, ˜σ x ∈ KK <strong>et</strong> ˜γ u ∈ KK se déduisent respectivement de (D.118),<br />
(D.116), (D.119) <strong>et</strong> (D.122). Il existe τ ∗ (ε,∆) ∈ [υ,¯τ) (défini par (D.168)), que l’on note τ ∗ ,<br />
tel que<br />
{<br />
max γ ωa 2<br />
1 (τ ∗ ,γ ω 1<br />
2 (s)),γωb 2<br />
1 (τ ∗ ,η ωa 2<br />
2 (γω 1<br />
2 (s))),γωb 2<br />
1 (τ ∗ ,η ω 1<br />
2 (s)),γω 1<br />
2 (γωa 2<br />
1 (τ ∗ ,s)),<br />
}<br />
γ ω 1<br />
2 (γωb 2<br />
1 (τ ∗ ,η ωa 2<br />
2 (s))),γω 1<br />
2 (γωb 2<br />
1 (τ ∗ ,η ω 1<br />
2 (s))) < s pour s ∈ [m,M],<br />
alors, il existe µ ∈ R >0 tel que pour tout τ ∈ [υ,τ ∗ ), (x 1 (t 0 ),x 2 (t 0 )) ∈ R nx 1 +nx 2<br />
L nu 1 +nu 2<br />
∞<br />
vérifient :<br />
(D.164)<br />
<strong>et</strong> (u 1 ,u 2 ) ∈<br />
avec max { |x 1 (t 0 )|,|x 2 (t 0 )|, ‖u 1 ‖ ∞ , ‖u 2 ‖ ∞<br />
}<br />
< ∆, les solutions de (D.124)-(D.125)<br />
|(x 1 (t),x 2 (t))| ≤ µ ∀t ≥ t 0 ≥ 0. (D.165)<br />
De plus, il existe β ∈ KL, σ ∈ K, ¯σ ∈ KK tels que pour tout τ ∈ [υ,τ ∗ ), (x 1 (t 0 ),x 2 (t 0 )) ∈<br />
R nx 1 +nx 2 <strong>et</strong> (u 1 ,u 2 ) ∈ L nu 1 +nu 2<br />
∞<br />
avec max { |x 1 (t 0 )|,|x 2 (t 0 )|, ‖u 1 ‖ ∞<br />
, ‖u 2 ‖ ∞<br />
}<br />
< ∆, les solutions