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 215<br />
D’autre part, d’après (D.129), pour tout t ∈ [t 0 ,t max ) :<br />
{<br />
|ω2(x a 2 (t))| ≤ max β 2 (|ω2(x a 2 ( t 2 ))|, t }<br />
2 ),γω 1<br />
2 (‖ω 1(x 1 )‖ [<br />
t<br />
2 ,t)),γu 2 (‖u 2 ‖ [<br />
t<br />
,t)) , (D.149)<br />
2<br />
par conséquent, d’après (D.127), (D.147), (D.148) <strong>et</strong> (D.149) :<br />
{<br />
|ω 1 (x 1 (t))| ≤ max β 1 (|ω 1 (x 1 ( t 2 ))|, t }<br />
2 ),γωa 2<br />
1 (τ, ‖ωa 2 (x 2)‖ [<br />
t<br />
2 ,t)),γu 1 (τ, ‖u 1‖ [<br />
t<br />
,t)) 2<br />
{<br />
≤ max β 1 (β 1 (|ω 1 (x 1 (t 0 ))|,0), t 2 ),β 1(γ ωa 2<br />
1 (τ,β 2(|ω2 a (x 2(t 0 ))|,0)), t 2 ),<br />
β 1 (γ ωa 2<br />
1 (τ,γu 2 (‖u 2‖ [t0 ,t) )), t 2 ),β 1(γ u 1 (τ, ‖u 1‖ [t0 ,t) ), t 2 ),<br />
β 1 (m, t 2 ),γωa 2<br />
1 (τ,β 2(β 2 (|ω a 2 (x 2(t 0 ))|,0), t 2 )),<br />
γ ωa 2<br />
1 (τ,β 2(γ ω 1<br />
2 (β 1(|ω 1 (x 1 (t 0 ))|,0)), t 2 )),<br />
un résultat analogue est vérifié par ω a 2 (x 2), ainsi,<br />
γ ωa 2<br />
1 (τ,β 2(γ ω 1<br />
2 (γu 1 (τ, ‖u 1‖ [t0 ,t) )), t 2 )),γωa 2<br />
1 (τ,β 2(γ u 2 (‖u 2‖ [t0 ,t) ), t 2 )),<br />
γ ωa 2<br />
1 (τ,β 2(m, t 2 )),γωa 2<br />
1 (τ,γω 1<br />
2 (‖ω 2<br />
1(x 1 )‖ [<br />
t<br />
2 ,t))),γωa 1 (τ,γu 2 (‖u 2‖ [<br />
t<br />
,t))), 2<br />
}<br />
γ1 u (τ, ‖u 1‖ [<br />
t<br />
,t)) 2<br />
max { |ω 1 (x 1 (t))|,|ω a 2 (x 2(t))| } ≤ max<br />
{<br />
˜β(max<br />
{<br />
|ω1 (x 1 (t 0 ))|,|ω a 2 (x 2(t 0 ))| } ,t − t 0 ),<br />
σ u (τ, max { ‖u 1 ‖ [t0 ,t) , ‖u 2‖ [t0 ,t)<br />
}<br />
),˜σ m (τ,m),<br />
où<br />
γ ωa 2<br />
1 (τ,γω 1<br />
2 (‖ω 1(x 1 )‖ [0,t)<br />
)),<br />
γ ω 1<br />
2 (γωa 2<br />
1 (τ, ‖ω 1(x 1 )‖ [0,t)<br />
))<br />
}<br />
, (D.150)<br />
{<br />
˜β(s,t) = max β 1 (β 1 (s,0), t 2 ),β 1(γ ωa 2<br />
1 (τ ∗ ,β 2 (s,0)), t 2 ),γωa 2<br />
1 (τ ∗ ,β 2 (β 2 (s,0), t 2 )),<br />
γ ωa 2<br />
1 (τ ∗ ,β 2 (γ ω 1<br />
2 (β 1(s,0)), t 2 ))<br />
β 2 (β 2 (s,0), t 2 ),β 2(γ ω 1<br />
2 (β 1(s,0)), t 2 ),γω 1<br />
2 (β 1(β 1 (s,0), t 2 )),<br />
γ ω 1<br />
2 (β 1(γ ωa 2<br />
1 (τ ∗ ,β 2 (s,0)), t 2 )) }, (D.151)<br />
σ u (τ,s) = max{¯σ u (τ,s),˜σ u (s)}, (D.152)<br />
{<br />
¯σ u (τ,s) = max β 1 (γ ωa 2<br />
1 (τ,γu 2 (s)),0),β 1 (γ1 u (τ,s),0),γ ωa 2<br />
1 (τ,β 2(γ ω 1<br />
2 (γu 1 (τ,s)),0)),<br />
γ ωa 2<br />
1 (τ,β 2(γ u 2 (s),0)),γ ωa 2<br />
1 (τ,γu 2 (s)),γ u 1 (τ,s),<br />
β 2 (γ ω 1<br />
2 (γu 1 (τ,s)),0),γω 1<br />
2 (β 1(γ ωa 2<br />
1 (τ,γu 2<br />
}<br />
(s)),0)),<br />
γ ω 1<br />
2 (β 1(γ1 u (τ,s),0)),γ ω 1<br />
2 (γu 1 (τ,s)) ,<br />
}<br />
˜σ u (s) = max<br />
{β 2 (γ2 u (s),0),γu 2 (s) , (D.153)