Reinforcement of stochastic resonance in cascaded bistable system

This paper studied the effects induced by adding the second driven periodic signal,the time scales of which match that of the intrawell fluctuations,into cascaded bistable system under stochastic resonance.Based on the model system designed by simulink and simulation experiment,we can observe the change of spectrum amplitude of the output signal x2 by comparing cascaded bistable system with the second driven signal in each level and without it.The result shows that the second driven signal can enhance the effect of stochastic resonance of cascaded bistable system.It also analyzed the reason why the increase after adding the second signal into the first cascaded system is higher than the one after adding driven signal into the sub-cascaded system.And it specified the qualification for how the second driven signal can control the stochastic resonance efficiently.