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Coriolis mass flowmeter vibration control method for measuring multiphase flow

A mass flowmeter and Coriolis technology, applied in the direction of measuring flow/mass flow, direct mass flowmeter, mass flow measurement device, etc., can solve the problem that the vibration control method cannot be applied to multiphase flow mass flow detection, etc., to achieve The effect of improving accuracy

Active Publication Date: 2019-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problem that the existing vibration control method cannot be applied to the mass flow detection of multiphase flow, the present invention provides a vibration control method of Coriolis mass flowmeter for measuring multiphase flow

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  • Coriolis mass flowmeter vibration control method for measuring multiphase flow
  • Coriolis mass flowmeter vibration control method for measuring multiphase flow
  • Coriolis mass flowmeter vibration control method for measuring multiphase flow

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] Such as figure 1 As shown, the drive system that the present invention is used to measure multiphase flow Coriolis mass flowmeter vibration control method to rely on comprises digital signal processor (hereinafter referred to as DSP), direct digital frequency synthesizer (hereinafter referred to as DDS), multiplication Digital-to-analog converter (MDAC for short) and audio power amplifier. After the drive system is powered on, the DDS is driven by the digital signal processor DSP to synthesize a square wave signal of a certain frequency. At the same time, the digital signal processor writes the control word to the MDAC. The amplitude of the square wave signal passed through MDAC is amplified according to the size of the control word, and then the audio power amplifier is amplified by a fixed multiple to drive the flow tube, so as to realize the rapid start-up ...

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Abstract

The invention relates to a Coriolis mass flowmeter vibration control method for measuring a multiphase flow. The Coriolis mass flowmeter vibration control method changes the existing idea of performing closed-loop control after adopting a DDS to oscillate a flow tube, adds the monitoring of feedback signal frequency and driving parameter variation in the original closed-loop control process, adopts a method of combination of DDS driving and optimized closed-loop control, overcomes the problem of large detection errors when a transient multiphase flow occurs in a measuring medium, and improvesthe measurement precision.

Description

technical field [0001] The invention relates to the technical field of fluid measurement, in particular to a vibration control method of a Coriolis mass flowmeter for measuring multiphase flow. Background technique [0002] Coriolis mass flowmeter is mainly composed of flow tube, speed sensor, signal processing system and drive system. [0003] The performance of the drive system directly affects the overall measurement accuracy of the flowmeter. The traditional drive system is composed of analog circuits, and the start-up process is driven by noise, which has problems such as long start-up time and poor start-up robustness. In order to solve the problems existing in the traditional drive system, the patent application with the publication number CN 105784037A discloses a device and method for synthesizing the vibration signal of a Coriolis flowmeter with an all-digital waveform. The application discloses that the structural frame of the vibration device includes micro Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/84
CPCG01F1/8422
Inventor 周立伟惠全民尹大海张鹏鲁晓晨
Owner CHINA PETROLEUM & CHEM CORP