Vortex flowmeter based on multi-sensor information fusion

Abstract

The invention discloses a vortex flowmeter based on multi-sensor information fusion. The vortex flowmeter has functions of effectively inhibiting an interference of a strong periodic vibration noise in a piezoelectric transducer signal, extracting a useful vortex signal from the piezoelectric transducer signal and accurately measuring the flow speed of fluid. The vortex flowmeter is characterized in that a temperature sensor and a differential pressure sensor with high vibration resistance are added on a traditional piezoelectric vortex flowmeter; the temperature sensor can be used for compensating the temperature drifts of the piezoelectric transducer and the differential pressure sensor; a multi-sensor data fusion algorithm based on an unscented Kalman Filter is used; Data fusion between an average value of the differential pressure which is output by the differential pressure sensor and a frequency of a piezoelectric signal that is obtained by the piezoelectric sensor is performed. The precision in locking a digital bandpass filter is improved. The vortex flowmeter has advantages of improving a measured signal-to-noise ratio of the vortex signal, improving vibration resistance of the piezoelectric vortex flowmeter, reducing a measurement lower limit of a least flow speed, enlarging a measuring range ratio, etc.

Description

technical field [0001] The invention relates to a vortex signal processing method based on multi-information fusion in a vortex flowmeter, and belongs to the technical field of fluid flow measurement. Background technique [0002] As an important part of detection technology, flow measurement occupies an important position in economic development. Among many types of flow meters, the vortex flowmeter realizes flow measurement according to the famous "Karman vortex street" principle in fluid mechanics. Within a certain range of Reynolds number, the frequency of vortex separation is proportional to the average flow velocity of the fluid in the pipeline. Thus, the flow velocity of the fluid can be obtained from the frequency of the vortex street signal, and then the flow rate of the fluid can be obtained. Since the vortex flowmeter has no mechanical moving parts, it can be applied to the measurement of various media, the pressure loss is small, the measurement accuracy is high...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a vortex flowmeter based on multi-information fusion to solve the shortcomings of traditional piezoelectric vortex flowmeters such as poor vibration resistance, high lower limit flow rate, and small range ratio under the condition of strong external noise and vibration interference. Flow meter and vortex signal processing method

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