Fluctuations de puissance hors-équilibre: Exemple des plaques élastiques minces
| When |
Jul 03, 2017
from 11:00 to 12:00 |
|---|---|
| Where | amphi. Schrödinger |
| Attendees |
Sebastien Aumaître |
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We will present experiment using the non-linear waves generated in a thin elastic plate as a tool to probe the injected power in out-of- equilibrium systems. In this device, we measured the injected power by a large electromagnetic shaker sustaining the wave motion. We estimated also the small amount of additional power injected by a small electromagnetic shaker in contact with the plate excited elsewhere by the large shaker. In both cases, we show that the fluctuations of injected power smoothed over a long time, can be interpreted within the same framework. This approach based on the stationary properties of the system, relates the variance of injected power to the dissipation. In the limit of a system in contact with an equilibrium thermostat and having Gaussian fluctuations of smoothed power, this point of view coincide with the fluctuation theorem.