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Coriolis mass flowmeter amplitude self-adaptation control method based on fluid state detecting

A Coriolis flowmeter and adaptive control technology, applied in adaptive control, mechanical oscillation control, non-electric variable control, etc., can solve the problems of weakening the advantages of high precision, increasing system power consumption, and reducing the steady-state performance of amplitude control , to achieve the effects of improving reliability and measurement performance, improving dynamic response speed, and enhancing adaptability

Inactive Publication Date: 2015-07-22
ZHEJIANG UNIV
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Problems solved by technology

However, when the parameters of the vibration system of the measuring tube are stable, the fuzzy PID control, compared with the fixed PID control, will cause frequent jumps in the PID parameters on the one hand, reduce the steady-state performance of the amplitude control, and have a negative impact on the measurement of the Coriolis flowmeter. , which weakens its high-precision advantages; on the other hand, the fuzzy PID control method needs to calculate and adjust the PID parameters in real time, which requires high data calculation and data storage capabilities of the system, and long-term operation will significantly increase system power consumption and improve Application cost of flow meter

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  • Coriolis mass flowmeter amplitude self-adaptation control method based on fluid state detecting
  • Coriolis mass flowmeter amplitude self-adaptation control method based on fluid state detecting
  • Coriolis mass flowmeter amplitude self-adaptation control method based on fluid state detecting

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] The inventive method comprises the following steps:

[0026] 1) if figure 1 As shown, a fluid state detection device 2 is installed between the inlet end of the Coriolis flowmeter measuring tube 3 and the fluid pipeline 1 to detect the fluid state; as figure 2 As shown, the fluid state detection device 2 includes a liquid ultrasonic transmitter 2_2, a liquid ultrasonic receiver 2_3 and a threshold comparator 5. The liquid ultrasonic transmitter 2_2 and the liquid ultrasonic receiver 2_3 are respectively installed on both sides of the installation pipe section 2_1 symmetry, and the liquid ultrasonic The receiver 2_3 is connected to the threshold comparator 5; the threshold comparator 5 is connected to the single-chip microcomputer, the single-chip microcomputer is connected with a timer, the single-chip microcomputer is connected to the control ...

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Abstract

The invention discloses a Coriolis mass flowmeter amplitude self-adaptation control method based on fluid state detecting. An ultrasonic transducer is arranged at an inlet end of a Coriolis mass flowmeter detecting pipe, through the attenuation effect on ultrasonic signals from impurities such as air bubbles, whether the amplitude value of received signals is changed suddenly is detected and judged via a threshold value comparer, whether impurities exist at a fluid state is obtained, and then switching of fixed PID and fuzzy PID amplitude controllers is carried out. According to the method, by detecting on the fluid state and self-adaptation controller switching, high-precision stable state control performance can be kept, system dynamic response speed can be improved, measuring pipe vibration stopping is avoided, stable vibration is reestablished quickly, the self adaptability of Coriolis mass flowmeter measuring pipe amplitude control is enhanced, and the reliability and the metering performance of a Coriolis mass flowmeter under a complex working condition are improved.

Description

technical field [0001] The invention relates to a Coriolis flowmeter control method, in particular to a Coriolis flowmeter amplitude adaptive control method based on fluid state detection. Background technique [0002] The Coriolis flowmeter has the characteristics of high precision, wide range ratio, and good repeatability. It represents the highest level of direct mass flow measurement technology and is widely used in petroleum, chemical, pharmaceutical, food, trade measurement and other industrial fields. Its working principle is to directly measure the mass flow rate by using the Coriolis force which is proportional to the mass flow rate generated when the fluid flows in the vibrating pipeline. [0003] The Coriolis flowmeter works based on the vibration of the measuring tube. It is generally believed in the industry that the amplitude stability of the measuring tube vibration has an important impact on the accurate measurement of the Coriolis flowmeter. It is also foun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/84G05B13/04G05D19/02
Inventor 傅新徐婵娜胡亮陈文昱
Owner ZHEJIANG UNIV
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