Dynamic Compensation Method of Ultrasonic Flowmeter

A dynamic compensation, ultrasonic technology, applied in the direction of volume measurement, measurement of flow/mass flow, liquid/fluid solid measurement, etc., can solve the increase of ultrasonic propagation signal amplitude, affecting the accuracy of flow measurement, abnormal changes in ultrasonic propagation time measurement, etc. The problem is to eliminate the deviation of flow calculation and improve the accuracy of flow calculation.

Active Publication Date: 2018-06-01
BEIJING INST OF CONTROL ENG
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practical applications, if there is a water hammer effect caused by the instantaneous switch of the valve or residual air bubbles in the pipeline, the amplitude of the ultrasonic propagation signal will increase or decrease, resulting in abnormal changes in the measurement of ultrasonic propagation time, thereby affecting the flow rate. measurement accuracy

Method used

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  • Dynamic Compensation Method of Ultrasonic Flowmeter
  • Dynamic Compensation Method of Ultrasonic Flowmeter
  • Dynamic Compensation Method of Ultrasonic Flowmeter

Examples

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Embodiment

[0110] Utilize the ultrasonic flowmeter to measure the flow Q of the spacecraft propellant, and perform multi-stage dynamic compensation to the measured ultrasonic flowmeter, and the spacecraft propellant uses dinitrogen tetroxide fluid; see image 3 , first the upstream ultrasonic transducer transmits the signal, the downstream ultrasonic transducer receives the received signal, detects the rising edge of three consecutive zero-crossing pulses in the received signal exceeding a pre-triggering threshold as the stop timing enable signal, and the measured time is sequentially respectively recorded as and The measured ultrasonic wave traveling time along the current is denoted as T up ,T up The initial value of Then the downstream ultrasonic transducer transmits the signal, the upstream ultrasonic transducer receives the received signal, detects that the rising edge of three consecutive zero-crossing pulses in the received signal exceeds a pre-trigger threshold, and serves ...

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Abstract

The invention discloses a dynamic compensation method for an ultrasonic flowmeter, which includes the step of measuring time dynamic cycle compensation, and further includes the step of fluid density compensation, the step of temperature compensation for the time difference between the upstream propagation time of ultrasonic waves and the downstream propagation time of ultrasonic waves, The step of dynamically looking up the calibration coefficient through the pre-established calibration coefficient lookup table and the step of flow calculation of multi-level dynamic compensation; thus, the water hammer effect caused by the instantaneous switch of the valve or the residual air bubbles in the pipeline will cause the ultrasonic propagation time measurement If there is a problem with deviation, the dynamic period compensation of the measurement time is carried out; further, the liquid density change caused by temperature is compensated; the temperature compensation is carried out for the time difference reference affected by the temperature change of the components in the circuit box, and the calibration coefficient of the non-fixed value is established. The lookup table performs dynamic lookup during flow calculation.

Description

technical field [0001] The invention relates to the technical field of spacecraft propulsion, in particular to a dynamic compensation method for an ultrasonic flowmeter. Background technique [0002] The spacecraft propulsion system completes on-orbit maneuvers such as orbit transfer, attitude control, and position maintenance. Propellants are crucial to ensure the completion of these on-orbit maneuver tasks. Therefore, it is very necessary to monitor and predict the propellants of on-orbit spacecraft . The propellant remaining measurement techniques commonly used at present are gas state equation method (PVT method) and billing method (BK method). Due to the influence of factors such as tank deformation, gas compression factor and gas solubility in liquid, and inaccurate sampling of the temperature and pressure of the on-board tank, the measurement error of the PVT method is greater than 2%. The ground test data of the system does not depend on the stable performance of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F15/02G01F15/00G01F1/66G01F25/00
Inventor 李宗良于洋李湘宁王雪婷焦焱姜涛潘海林耿永兵梁军强张琰
Owner BEIJING INST OF CONTROL ENG
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