【摘要】：分析了小流量渦街信號(hào)特性,探討了信號(hào)與隨機(jī)共振系統(tǒng)的閾值和克萊默斯逃逸率之間的關(guān)系,提出一種基于幅值和頻率雙重調(diào)制的隨機(jī)共振方法,用于檢測(cè)小流量渦街信號(hào)的頻率。該方法以外加控制信號(hào)的幅值和頻率作為調(diào)控變量,采用多參數(shù)控制方式使小流量渦街信號(hào)產(chǎn)生隨機(jī)共振。經(jīng)數(shù)值仿真及實(shí)驗(yàn)研究,表明該方法能將小流量渦街信號(hào)通過(guò)隨機(jī)共振得到增強(qiáng),有效獲取渦街頻率,實(shí)現(xiàn)小流量測(cè)量,為隨機(jī)共振的控制和微弱信號(hào)的檢測(cè)提供一種新方法。
[Abstract]:The characteristics of vortex street signal with small flow rate are analyzed. The relationship between the signal and the threshold of stochastic resonance system and the escape rate of Kramer is discussed. A stochastic resonance method based on amplitude and frequency modulation is proposed. Used to detect the frequency of small flow vortex signals. In this method, the amplitude and frequency of the external control signal are taken as the control variables, and the multi-parameter control method is used to make the vortex street signal with small flux generate stochastic resonance. Through numerical simulation and experimental study, it is shown that this method can enhance the signal of vortex street with small flux through stochastic resonance, obtain vortex frequency effectively, and realize the measurement of small flow rate. It provides a new method for the control of stochastic resonance and the detection of weak signal.
【作者單位】： 中國(guó)計(jì)量學(xué)院計(jì)量測(cè)試工程學(xué)院;
【基金】：浙江省自然科學(xué)基金資助項(xiàng)目(LY13E050012,LY13A020004)
【分類號(hào)】：TH814

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