本文選題：信號處理 + 隨機(jī)共振��； 參考：《傳感技術(shù)學(xué)報(bào)》2016年05期

【摘要】：研究一種用于渦街流量計(jì)渦街頻率測量的隨機(jī)共振信號處理方法。探討了信號與雙穩(wěn)系統(tǒng)的閾值和克萊默斯逃逸率之間的關(guān)系,通過外加幅值和頻率可調(diào)的信號進(jìn)行雙重調(diào)制,實(shí)現(xiàn)信號與雙穩(wěn)系統(tǒng)的匹配,數(shù)值仿真表明該匹配方式是可行和有效的。針對渦街信號,提出基于標(biāo)準(zhǔn)差的調(diào)制參數(shù)選取方法,該方法利用渦街信號特征,通過信號標(biāo)準(zhǔn)差估計(jì)管道內(nèi)流速,縮小了調(diào)制參數(shù)的選取范圍,提高了信號與雙穩(wěn)系統(tǒng)匹配的效率。實(shí)驗(yàn)結(jié)果表明,利用標(biāo)準(zhǔn)差選取調(diào)制參數(shù)對渦街信號進(jìn)行調(diào)制,可以有效地使渦街信號,特別是弱渦街信號產(chǎn)生隨機(jī)共振,進(jìn)而檢測到渦街頻率,實(shí)現(xiàn)流量測量。
[Abstract]:A stochastic resonance signal processing method for vortex frequency measurement of vortex Flowmeter is studied. The relationship between the signal and the threshold of bistable system and the escape rate of Kramer is discussed. The matching between the signal and bistable system is realized by double modulation of the signal with adjustable amplitude and frequency. Numerical simulation shows that the matching method is feasible and effective. A modulation parameter selection method based on standard deviation is proposed for vortex signals. This method uses the characteristics of vortex signals and estimates the velocity of the pipeline by the signal standard deviation, which reduces the range of modulation parameters. The efficiency of signal matching with bistable system is improved. The experimental results show that the random resonance of vortex signal, especially the weak vortex signal, can be effectively generated by modulating vortex signal by selecting modulation parameters of standard deviation, and the vortex frequency can be detected and the flow rate can be measured.
【作者單位】： 中國計(jì)量學(xué)院計(jì)量測試工程學(xué)院;
【基金】：浙江省自然科學(xué)基金項(xiàng)目(LY13E050012)
【分類號】：TH814
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本文編號：2085934