Electromagnetic flow measurement system signal processing method based on improved Kalman filtering
A technology of Kalman filter and Kalman filter, which is applied in the application of electromagnetic flowmeter to detect fluid flow, volume/mass flow generated by electromagnetic effect, etc., can solve the problems of slow response speed and limited application range, and achieve reliable measurement, The effect of improving the response speed
Inactive Publication Date: 2021-07-23
HEFEI UNIV OF TECH
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[0006] The purpose of the present invention is to solve the problem of limited application range and slow response speed of the existing electromagnetic flow measurement system signal processing method, and propose a signal processing method based on the improved Kalman filter for the electromagnetic flow measurement system to achieve constant flow of water flow with high precision Measurement and reliable measurement of solid-liquid two-phase flow, and fast follow-up of changing flow
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[0046] The present invention will be further described below in conjunction with the accompanying drawings.
[0047] The principle diagram of the signal processing method of the electromagnetic flow measurement system based on the improved Kalman filter proposed by the present invention is as follows figure 1 shown. The specific process includes: (1) According to the characteristics of the output signals of sensors with different excitation methods, select the corresponding demodulation method to obtain the demodulation result Amp containing flow velocity information; (2) configure the variables and parameters of the Kalman filter, Amp filtering of the noise demodulation result; (3) According to the filtering result, calculate the filtering difference γ(k), and compare with the given threshold Make a comparison to judge whether the flow rate has changed, dynamically adjust the filter parameters, and perform filtering.
[0048] The embodiment of the present invention takes t...
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The invention relates to an electromagnetic flow measurement system signal processing method based on improved Kalman filtering. In order to solve the problems that a traditional electromagnetic flow measurement system signal processing method is limited in application range and low in response speed, a Kalman filter is adopted to filter a flow demodulation result, and the parameters of the filter are dynamically adjusted according to a filtering difference sequence, so that constant-flow water flow high-precision measurement, solid-liquid two-phase flow reliable measurement and fast tracking of variable flow can be achieved The signal processing process comprises the following steps: (1) selecting a corresponding flow signal demodulation method according to the characteristics of sensor output signals of different excitation modes to obtain a flow demodulation result Amp; (2) configuring Kalman filter parameters, and filtering a noise-containing demodulation result Amp; and (3) calculating a filtering difference gamma (k) according to a filtering result, comparing the filtering difference gamma (k) with a threshold value, judging whether the flow is changed or not, and dynamically adjusting the parameters of the filter. According to the invention, stable and reliable measurement of constant flow and rapid following of variable flow is achieved.
Description
technical field [0001] The invention belongs to the field of flow detection, in particular to a signal processing method of an electromagnetic flow measurement system based on an improved Kalman filter. Background technique [0002] Electromagnetic flowmeter is an inductive instrument that measures the volume flow of conductive medium in a pipe according to Faraday's law of electromagnetic induction. Water resources and other industries have been widely used. In the actual application of electromagnetic flowmeter, due to the influence of measurement environment and fluid, a large amount of interference noise is often superimposed, which makes flow measurement difficult. In different measurement environments, the interference noise superimposed in the output signal of the electromagnetic flowmeter sensor is different. When measuring water flow, noises such as polarization interference, differential interference, in-phase interference, series mode interference, and common mo...
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IPC IPC(8): G01F1/58
CPCG01F1/58
Inventor 梁利平秦晓文高海潮齐飞燕王鸣柴玲宾杨双龙黄云志徐科军陈丞
Owner HEFEI UNIV OF TECH