# Stabilization of the wave equation by on-off and positive-negative feedbacks

Patrick Martinez; Judith Vancostenoble

ESAIM: Control, Optimisation and Calculus of Variations (2010)

- Volume: 7, page 335-377
- ISSN: 1292-8119

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topMartinez, Patrick, and Vancostenoble, Judith. "Stabilization of the wave equation by on-off and positive-negative feedbacks." ESAIM: Control, Optimisation and Calculus of Variations 7 (2010): 335-377. <http://eudml.org/doc/90626>.

@article{Martinez2010,

abstract = {
Motivated by several works on the stabilization of the oscillator by
on-off feedbacks, we study the related problem for the one-dimensional wave equation, damped
by an on-off feedback $a(t)u_t$.
We obtain results that are radically different from those known in the case
of the oscillator. We consider periodic functions a: typically
a is equal to 1 on (0,T),
equal to 0 on (T, qT) and is qT-periodic.
We study the boundary case and next the locally distributed case,
and we give optimal results of stability. In both cases,
we prove that there are explicit exceptional values of T
for which the energy of some solutions remains constant with time. If
T is different from those exceptional values, the energy of all solutions
decays exponentially to zero. This number of exceptional values is
countable in the boundary case and
finite in the distributed case.
When the feedback is acting on the boundary,
we also study the case
of postive-negative feedbacks: $a(t) = a_0 >0$ on (0,T),
and $a(t) = -b_0 <0 $ on (T,qT), and we give the necessary and
sufficient condition
under which the energy (that is no more nonincreasing with time) goes
to zero or goes to infinity.
The proofs of these results
are based on congruence properties and on a theorem of Weyl in the
boundary case, and on
new observability inequalities for the undamped wave equation,
weakening the usual “optimal time condition” in the locally distributed case.
These new inequalities provide also new exact controllability results.
},

author = {Martinez, Patrick, Vancostenoble, Judith},

journal = {ESAIM: Control, Optimisation and Calculus of Variations},

keywords = {Damped wave equation; asymptotic behavior;
on-off feedback; congruences; observability inequalities.; damped wave equation; congruence properties; on-off feedback; observability inequalities; exact controllability},

language = {eng},

month = {3},

pages = {335-377},

publisher = {EDP Sciences},

title = {Stabilization of the wave equation by on-off and positive-negative feedbacks},

url = {http://eudml.org/doc/90626},

volume = {7},

year = {2010},

}

TY - JOUR

AU - Martinez, Patrick

AU - Vancostenoble, Judith

TI - Stabilization of the wave equation by on-off and positive-negative feedbacks

JO - ESAIM: Control, Optimisation and Calculus of Variations

DA - 2010/3//

PB - EDP Sciences

VL - 7

SP - 335

EP - 377

AB -
Motivated by several works on the stabilization of the oscillator by
on-off feedbacks, we study the related problem for the one-dimensional wave equation, damped
by an on-off feedback $a(t)u_t$.
We obtain results that are radically different from those known in the case
of the oscillator. We consider periodic functions a: typically
a is equal to 1 on (0,T),
equal to 0 on (T, qT) and is qT-periodic.
We study the boundary case and next the locally distributed case,
and we give optimal results of stability. In both cases,
we prove that there are explicit exceptional values of T
for which the energy of some solutions remains constant with time. If
T is different from those exceptional values, the energy of all solutions
decays exponentially to zero. This number of exceptional values is
countable in the boundary case and
finite in the distributed case.
When the feedback is acting on the boundary,
we also study the case
of postive-negative feedbacks: $a(t) = a_0 >0$ on (0,T),
and $a(t) = -b_0 <0 $ on (T,qT), and we give the necessary and
sufficient condition
under which the energy (that is no more nonincreasing with time) goes
to zero or goes to infinity.
The proofs of these results
are based on congruence properties and on a theorem of Weyl in the
boundary case, and on
new observability inequalities for the undamped wave equation,
weakening the usual “optimal time condition” in the locally distributed case.
These new inequalities provide also new exact controllability results.

LA - eng

KW - Damped wave equation; asymptotic behavior;
on-off feedback; congruences; observability inequalities.; damped wave equation; congruence properties; on-off feedback; observability inequalities; exact controllability

UR - http://eudml.org/doc/90626

ER -

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