A method based on dual-resonance to detect vortex shedding signal

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (19) : 93-96.

论文

A method based on dual-resonance to detect vortex shedding signal

ZHENG Jun LIN Min

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Abstract

The coupled bistable system is composed of controlled system and control system by means of nonlinear coupling. The dual-resonance characteristics of coupled bistable system under the controlling signal action were analyzed. A method based on dual-resonance to enhance stochastic resonance was proposed, and the method was applied to the detection of vortex shedding signals. Numerical simulations and experimental results manifest that with a controlling signal added to the control system, adjusting signal frequency can emerge the resonance which enhances stochastic resonance of controlled system substantially. The power spectrum of coupling systems’ output at the eigen frequency can increase greatly, and it can detect weak signal of vortex shedding submerged in noise effectively.