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Method for detecting vortex street frequency based on heterodyne type accidental resonation

A stochastic resonance, vortex frequency technology, applied in the direction of detecting the dynamic effect of fluid flow, volume/mass flow generated by mechanical effect, measurement device, etc. Normal use, inability to measure the vortex frequency correctly, etc., to achieve good application prospects, improve site adaptability, and broaden the application effect

Inactive Publication Date: 2010-06-09
CHINA JILIANG UNIV
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Problems solved by technology

All these noises will cause the signal-to-noise ratio of the on-site measurement signal to decrease. When the interference is serious or when the flow rate is small, the vortex frequency cannot even be measured correctly, which affects the normal use of the vortex flowmeter.

Method used

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  • Method for detecting vortex street frequency based on heterodyne type accidental resonation
  • Method for detecting vortex street frequency based on heterodyne type accidental resonation
  • Method for detecting vortex street frequency based on heterodyne type accidental resonation

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Embodiment Construction

[0019] The vortex frequency detection method based on heterodyne stochastic resonance of the present invention comprises the following steps:

[0020] 1. The vortex signal is input into the mixer, and two different frequency components, high and low, are generated by heterodyne method.

[0021] Multiply the output signal of the vortex flowmeter with the vortex frequency f0 and the output signal of the carrier signal generator with the frequency fc in the mixer to obtain two signals with the frequency fc±f0, where the sum frequency fc+f0 is High frequency, while the difference frequency Δf=fc-f0 is low frequency.

[0022] 2. The output signal of the mixer acts on the stochastic resonance system again, and the power spectrum output by the stochastic resonance system is analyzed.

[0023] The sum frequency signal and difference frequency signal input to the nonlinear bistable system, when the frequency of the difference frequency signal Δf=fc-f0 is low, it is easy to form stocha...

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Abstract

The invention discloses a vortex frequency detecting method based on a heterodyne random resonate. The method inputs the vortex signal into the heterodyne random resonate system, adjusts the frequencyof the carrier signal continuously and analyzes the power spectrum and the power spectrum reciprocal of the output signal. The resonate spectrum peak then disposes an obvious process changing with the frequency, therefore the frequency of the resonate spectrum peak is taken conveniently and accurately, which is also called vortex signal frequency. The method is characterized in an effective increase of the signal-to-noise ration of the vortex signal, and the method is new in improving the adaptability of the vortex flow meter and detecting the frequency of the low-flow and weak vortex signals.

Description

technical field [0001] The invention relates to a vortex signal processing method, in particular to a vortex frequency detection method based on heterodyne stochastic resonance used in a vortex flowmeter. Background technique [0002] The vortex flowmeter is a flowmeter designed based on the Karman vortex principle. It has developed rapidly since the 1970s and has been widely used in the measurement of gas, liquid and steam flow. Vortex flowmeters are essentially fluid vibration flowmeters. Therefore, when used in industrial sites, the interference caused by the vibration of pipelines and various equipment will reduce the measurement accuracy and affect the lower limit of measurement. In terms of vortex signal processing, using modern signal processing methods to process vortex flowmeter signals and accurately extracting vortex frequency from noise-containing signals to improve measurement accuracy is one of the current research hotspots of vortex flowmeters. Most of the me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/32G01F15/00
Inventor 林敏黄咏梅
Owner CHINA JILIANG UNIV