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Related Concept Videos

Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
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A spray tank system is engineered to uniformly distribute a pest-control liquid across plants by using a pressurized mechanism. The tank, pressurized to 150 kPa, holds the pesticide at a height of 0.80 meters. Liquid flows from the tank through a 1.9 meter pipe with a diameter of 0.015 meters, angled at 0.698 radians, ultimately reaching a 0.007 meter nozzle that sprays the pesticide. Accurate calculation of the system's flow rate is crucial to ensure uniform application, and this is achieved...
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High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
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Frequency-feature based antistrong-disturbance signal processing method and system for vortex flowmeter with single

Ke-Jun Xu1, Qing-Lin Luo, Gang Wang

  • 1School of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, People's Republic of China. xukejun@mail.hf.ah.cn

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Summary

A novel antistrong-disturbance signal processing method effectively extracts vortex flow signals from significant mechanical vibration noise. This method ensures accurate flow measurement in challenging industrial environments using frequency analysis and autocorrelation functions.

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Area of Science:

  • Instrumentation and Measurement
  • Signal Processing
  • Fluid Dynamics

Background:

  • Traditional digital signal processing for vortex flowmeters struggles with strong mechanical vibration noise that overwhelms the flow signal.
  • Existing methods fail when mechanical vibration noise power exceeds vortex flow signal power, limiting accuracy in industrial settings.
  • A robust solution is needed to reliably extract vortex flow information amidst significant interference.

Purpose of the Study:

  • To develop an antistrong-disturbance signal processing method for vortex flowmeters with a single sensor.
  • To address the limitation where mechanical vibration noise power is greater than the vortex flow signal power.
  • To enable accurate flow measurement in environments with substantial mechanical interference.

Main Methods:

  • Proposed an antistrong-disturbance algorithm leveraging distinct frequency bandwidths of vortex flow signals and mechanical vibration noise.
  • Utilized spectrum analysis, bandpass filtering, and autocorrelation function (at fixed delay and tau=0) to calculate signal ratios.
  • Developed a low-power, two-wire digital signal processing system using an ultralow-power microcontroller to implement the algorithm.

Main Results:

  • The frequency corresponding to the minimal ratio derived from autocorrelation was identified as the vortex flow frequency.
  • Water flow-rate calibration and vibration tests demonstrated the effectiveness of the proposed algorithm.
  • The developed digital signal processing system successfully implemented the algorithm while maintaining low-power and two-wire operation.

Conclusions:

  • The novel antistrong-disturbance signal processing method effectively distinguishes vortex flow signals from strong mechanical vibration noise.
  • The developed digital signal processing system is effective for process instrumentation, ensuring low-power and reliable flow measurement.
  • The approach provides a robust solution for vortex flowmeter applications facing significant environmental interference.