Method for designing Coriolis mass flow meter digital drive system

Abstract

The invention relates to the technical field of signal processing and application of mass flow meters based on the Coriolis principle, in particular to a method for designing a Coriolis mass flow meter digital drive system. The method includes the steps that firstly, according to the characteristics of a Coriolis mass flow meter, a fuzzy PI amplitude control algorithm is designed; secondly, the fuzzy PI amplitude control algorithm is applied to the Coriolis mass flow meter digital drive system, and then a measurement tube can rapidly vibrate at the fixed amplitude when different fluids are measured under different measurement environments. According to the method, the fuzzy PI control algorithm is added based on an existing nonlinear amplitude control algorithm, a frequency estimation algorithm based on zero-cross detection is adopted, a whole control system is more intelligent and more flexible, a software and hardware test system of the Coriolis mass flow meter digital drive system based on a DSP is designed, and therefore the measurement tube of the Coriolis mass flow meter can rapidly vibrate at the fixed amplitude.

Description

technical field [0001] The invention relates to the technical field of signal processing and application of a mass flowmeter based on the Coriolis principle, in particular to a design method for a digital drive system of a Coriolis mass flowmeter. Background technique [0002] Coriolis Mass Flowmeter (Coriolis Mass Flowmeter, English abbreviation CMF, hereinafter referred to as Coriolis mass flowmeter) is a kind of Coriolis force principle developed, that is, the fluid in the rotating system at the same time Moving in a straight line creates a Coriolis force proportional to the mass of the fluid. The flowmeter was successfully developed by Micro Motion Company in 1977. It not only has high accuracy, stability and repeatability, but also has no flow blocking elements in the measuring tube, which greatly improves the reliability and service life. At present, most of the clean fuel compressed natural gas (CNG) used in automobiles is measured by it, and it is more and more used...

AI Technical Summary

Problems solved by technology

Taiyuan Aviation Instrument Co., Ltd. is currently working with Fan Shangchun, Zheng Dezhi and Xing Weiwei from the School of Instrument Science and Optoelectronic Engineering of Beihang University to study the semi-digital drive scheme, and has completed the simulation and circuit implementation. It is obtained that the current all-digital drive algorithm is stronger than the half-digital drive in terms of drive capability and precision

The DSP laboratory of Hefei University of Technology designed a new digital Coriolis mass flow transmitter and completed the on-site test. optimization; at the same time, a driving scheme based on a nonlinear amplitude control algorithm is proposed, which not only shortens the start-up time of the flow tube, but also enhances the control of the vibration of the measuring tube when two-phase flow / batch flow occurs; also studies The digital driving scheme and its realization in the two-phase flow device were proposed, in which positive and negative step signals with good performance were used to start the vibration, waveform synthesis and other methods, and the two-phase flow experimental device was also designed. However, the research program Although the amplitude control algorithm based on the variable ratio parameter can achieve limited amplitude control, its amplitude stabilization speed and accuracy need to be improved

Images