A Vortex Flowmeter Based on Multi-sensor Information Fusion

Abstract

The invention discloses a vortex flowmeter based on multi-sensor information fusion, which can effectively suppress the interference of strong periodic vibration noise in the piezoelectric sensor signal, extract useful vortex signals therefrom, and accurately measure the flow velocity of the fluid. Its core is that a temperature sensor and a strong vibration-resistant differential pressure sensor are added to the traditional piezoelectric vortex flowmeter, and the temperature sensor can be used to compensate the temperature drift of the piezoelectric sensor and differential pressure sensor; The multi-sensor data fusion algorithm of Unscented Kalman Filter (UKF) integrates the average value of the differential pressure output by the differential pressure sensor and the frequency value of the piezoelectric signal obtained by the piezoelectric sensor, which improves the digital band-pass filter. The accuracy of the device lock. The invention can improve the signal-to-noise ratio of the vortex street signal measurement, has the advantages of enhancing the vibration resistance of the piezoelectric vortex street flowmeter, reducing the minimum flow rate measurement lower limit, widening the range ratio and the like.

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

Images