As shown in Chap. 2 bistability is necessary for stochastic resonance. However, for vibrational resonance, bistability is not a necessary requirement. Even a monostable nonlinear system can exhibit double resonance. Thus, one wish to know the features of high-frequency induced resonance in double-well and triple-well systems. For this purpose, consider a multistable system (that is a system with more than one stable equilibrium point) driven by a single periodic force. In a multistable system, for sufficiently small values of f each of the coexisting orbits enclose only one equilibrium point. For higher values of f, a transition between the coexisting equilibrium states takes place. It is important to analyze the influence of such a transition on vibrational resonance. There is another class of systems called excitable systems . They have only one stable fixed point, but perturbations above a certain threshold induce large excursions in phase space, which take the form of spikes or pulses. That is, a rest condition can be transformed into a firing condition near the excitable threshold. Excitability is an essential characteristic of excitable media. Interestingly, many biological, physical and electronic circuit systems are excitable systems. How does vibrational resonance arise in excitable systems?
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