基于双共振的涡街信号检测方法

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (19) : 93-96.

论文

基于双共振的涡街信号检测方法

郑俊，林敏

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

ZHENG Jun LIN Min

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摘要

耦合双稳系统由控制系统和被控系统经非线性方式耦合而成。分析了控制信号作用下耦合双稳系统的双共振特性，提出了基于双共振的随机共振增强方法，并将该方法应用于涡街流量信号的检测。数值仿真和实验结果表明，改变控制信号的频率可在控制系统中产生共振，进而增强被控系统中的随机共振, 系统输出功率谱在特征频率处的谱值显著提高，从而准确检测出噪声背景中的微弱涡街信号。

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.