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Intrawell stochastic resonance versus interwell stochastic resonance in underdamped bistable systems
Alfonsi1, Gammaitoni, Santucci
1Dipartimento di Fisica, Universita di Perugia, I-06100 Perugia, Italy.
Summary
Stochastic resonance in driven bistable systems can exhibit two peaks, showing both intrawell and interwell effects. This noise-controlled nonlinear resonance matches system time scales.
Area of Science:
- Nonlinear dynamics
- Statistical physics
- Complex systems
Background:
- Bistable systems are common in physics and engineering.
- Stochastic resonance enhances weak signals in nonlinear systems.
- Periodically driven systems exhibit complex dynamics.
Purpose of the Study:
- Investigate intrawell and interwell stochastic resonance in driven noisy bistable systems.
- Demonstrate double-maximum power spectral amplitude.
- Provide experimental evidence and a theoretical description.
Main Methods:
- Theoretical analysis of periodically driven noisy underdamped bistable systems.
- Experimental verification of phenomena.
- Phenomenological nonadiabatic description using noise-controlled nonlinear dynamic resonance.
Main Results:
- Observed intrawell stochastic resonance alongside conventional interwell stochastic resonance.
- Identified a double maximum in power spectral amplitude versus noise intensity.
- Correlated maxima locations with matching deterministic and stochastic time scales.
Conclusions:
- Periodic driving and noise can induce complex resonance phenomena in bistable systems.
- The study presents experimental evidence for dual stochastic resonance.
- A noise-controlled nonlinear dynamic resonance model explains the observed behavior.
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