Almost periodic motion of a string vibrating against a straight fixed obstacle
Résumé
In a plane with normalized coordinate system $Oxu$, we consider the small oscillations of a
vibrating string with fixed ends $(\pm 1/2,0)$. The free oscillations of this string are perturbed by
the presence of a fixed obstacle $\{u = -h\}$, against which it rebounds following a law which
insures conservation of the energy $(0 \leq h \le 1)$.
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