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 187<br />
Ainsi, pour t ∈ [t 0 ,∞), on a d’après (D.62), (D.67) <strong>et</strong> (D.69) :<br />
{<br />
|ω 1 (x 1 (t))| ≤ max β 1 (|ω 1 (x 1 (t 0 ))|,t − t 0 ),γ ωa 2<br />
1 (β 2(|ω2(x a 2 (t 0 ))|,0)),<br />
}<br />
γ ωa 2<br />
1 (γω 1<br />
2 (‖ω 1(x 1 )‖ [t0 ,t) )),γωa 2<br />
1 (γu 2 (‖u 2 ‖ [t0 ,t) )),γu 1 (‖u 1 ‖ [t0 ,t) ) {<br />
‖ω 1 (x 1 )‖ [t0 ,t)<br />
≤ max β 1 (|ω 1 (x 1 (t 0 ))|,0),γ ωa 2<br />
1 (β 2(|ω2(x a 2 (t 0 ))|,0)),<br />
par symétrie,<br />
γ ωa 2<br />
1 (γu 2 (‖u 2‖ [t0 ,t) )),γu 1 (‖u 1‖ [t0 ,t) ),m }, (D.70)<br />
{<br />
‖ω2 a (x 2)‖ [t0 ,t)<br />
≤ max β 2 (|ω2 a (x 2(t 0 ))|,0),γ ω 1<br />
2 (β 1(|ω 1 (x 1 (t 0 ))|,0)),<br />
γ ω 1<br />
2 (γu 1 (‖u 1‖ [t0 ,t) )),γu 2 (‖u 2‖ [t0 ,t) ),m }. (D.71)<br />
D’autre part, d’après (D.54) 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.72)<br />
2<br />
par conséquent d’après (D.52), (D.70), (D.71) <strong>et</strong> (D.72) :<br />
{<br />
|ω 1 (x 1 (t))| ≤ max β 1 (|ω 1 (x 1 ( t 2 ))|, t }<br />
2 ),γωa 2<br />
1 (‖ωa 2(x 2 )‖ [<br />
t<br />
2 ,t)),γu 1 (‖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 (β 2(|ω2(x a 2 (t 0 ))|,0)), t 2 ),<br />
β 1 (γ ωa 2<br />
1 (γu 2 (‖u 2 ‖ [t0 ,t) )), t 2 ),β 1(γ u 1 (‖u 1 ‖ [t0 ,t) ), t 2 ),<br />
β 1 (m, t 2 ),γωa 2<br />
1 (β 2(β 2 (|ω a 2(x 2 (t 0 ))|,0), t 2 )),<br />
γ ωa 2<br />
1 (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 (β 2(γ ω 1<br />
2 (γu 1 (‖u 1 ‖ [t0 ,t) )), t 2 )),γωa 2<br />
1 (β 2(γ u 2 (‖u 2 ‖ [t0 ,t) ), t 2 )),<br />
γ ωa 2<br />
1 (β 2(m, t 2 )),γωa 2<br />
1 (γω 1<br />
2 (‖ω 2<br />
1(x 1 )‖ [<br />
t<br />
2 ,t))),γωa 1 (γu 2 (‖u 2 ‖ [<br />
t<br />
,t))), 2<br />
}<br />
γ1 u (‖u 1 ‖ [<br />
t<br />
,t)) .<br />
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 (max { ‖u 1 ‖ [t0 ,t) , ‖u 2‖ [t0 ,t)<br />
}<br />
),˜σ m (m),<br />
γ ωa 2<br />
1 (γω 1<br />
2 (‖ω 1(x 1 )‖ [0,t)<br />
)),<br />
γ ω 1<br />
2 (γωa 2<br />
1 (‖ω 1(x 1 )‖ [0,t)<br />
))<br />
}<br />
, (D.73)