Coriolis mass flowmeter plus-minus phase-step alternative excitation vibration-starting method and system thereof

A mass flowmeter, positive and negative technology, applied in the field of Coriolis mass flowmeter vibration method and system, can solve problems such as no specific instructions, and achieve the effect of simple implementation process, improved reliability and rapidity

Active Publication Date: 2009-12-23
HEFEI UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The patent mentions the method of using a square wave to start the vibration, but there is no

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  • Coriolis mass flowmeter plus-minus phase-step alternative excitation vibration-starting method and system thereof
  • Coriolis mass flowmeter plus-minus phase-step alternative excitation vibration-starting method and system thereof
  • Coriolis mass flowmeter plus-minus phase-step alternative excitation vibration-starting method and system thereof

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[0021] The present invention will be further explained below in conjunction with the drawings.

[0022] The principle block diagram of digital drive is as figure 1 Shown. The vibration system of the Coriolis mass flowmeter is a forced vibration system with unlimited degrees of freedom, with an unlimited number of main vibration modes. The excitation system generally adopts the first main vibration mode. When the frequency of the excitation signal is equal to the natural frequency of the excitation system, the output signal amplitude of the flow tube is the largest, and the required driving energy is the least. In the initial stage of digital drive, the drive module generates a system self-excited signal to excite the flow tube; when the output signal amplitude u of the sensor on the flow tube reaches a certain amplitude a, the excitation is stopped and the zero drive mode is entered; The estimation algorithm obtains the natural frequency of the flow tube, and then synthesizes the...

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Abstract

The invention relates to the field of flow measurement, in particular to a coriolis mass flowmeter plus-minus phase-step alternative excitation vibration-starting method and a system thereof. The system comprises a magnetoelectric velocity transducer, a voltage follower, a low-pass filtering amplifier, a biasing circuit, a limiter circuit, an audio-frequency CODEC (coder decoder), a DSP (display signal processor), a DDS (direct digital synthesizer), an amplifier, a MDAC (multiplication digital-to-analog converter), a power amplifier and a vibration exciter. The vibration amplitude of a flow tube can be enlarged continuously, reliably and rapidly by tracking phases of self-excitation output signals of detecting sensors and carrying out plus-minus phase-step alternative excitation, and the vibration-starting time of the flow tube can be shortened greatly with the combination of non-linear amplitude control algorithm and frequency estimation algorithm.

Description

technical field [0001] The invention relates to the field of flow detection, and is a method and system for positive and negative steps of a Coriolis mass flowmeter (referred to as a Coriolis mass flowmeter for short) to alternately excite and start vibrations, in particular a DSP-based, positive and negative step-based A method and system for starting a Coriolis mass flowmeter with jump alternating excitation, adaptive notch frequency tracking and nonlinear amplitude control. Background technique [0002] With the development of process industry, it is necessary to use Coriolis mass flowmeter to measure batch flow and gas-liquid two-phase flow. When batch material flow or gas-liquid two-phase flow occurs, the effective mass flowing through the flow tube changes, resulting in changes in the damping ratio and natural frequency of the flow tube. If the analog drive is used, due to its limited drive gain, simple gain control algorithm and slow frequency tracking, it cannot mai...

Claims

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Application Information

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IPC IPC(8): G01F1/84
Inventor 徐科军李苗朱永强侯其立李叶
Owner HEFEI UNIV OF TECH
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