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Related Experiment Videos

A measurement method of the flow rate in a pipe using a microphone array.

Yong-Beum Kim1, Yang-Hann Kim

  • 1Mechanical and Material Department, Korea Institute of Nuclear Safety, Taejon. ybkim@kins.re.kr

The Journal of the Acoustical Society of America
|September 24, 2002
PubMed
Summary

This study introduces a novel acoustic method for precise pipe flow rate measurement. The technique uses sound waves and microphone arrays, achieving accuracy within a 5% error bound.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Signal Processing

Background:

  • Accurate flow rate measurement is critical in various industrial applications.
  • Existing methods may face limitations in accuracy or applicability.
  • Acoustic methods offer a non-invasive approach to flow monitoring.

Purpose of the Study:

  • To develop and validate a new method for measuring flow rate in pipes using acoustic pressure signals.
  • To derive a formula relating flow rate to changes in acoustic wave number.
  • To address and compensate for measurement errors in the acoustic flow rate estimation.

Main Methods:

  • Utilizing one-dimensional acoustic pressure signals generated by a loudspeaker.
  • Employing a microphone array flush-mounted to the inner pipe wall for signal acquisition.

Related Experiment Videos

  • Deriving flow rate from the change in wave number, estimated via recursive analysis of microphone signals.
  • Implementing an error compensation method to improve accuracy.

    • Main Results:

    • A formula for flow rate was derived based on the change in wave number.
    • The change in wave number was successfully estimated from microphone array signals.
    • Measurement errors were identified and a compensation method was proposed.
    • Numerical simulations and experiments confirmed the method's applicability.
    • The developed method achieved flow rate estimations within a 5% error bound.

    Conclusions:

    • The proposed acoustic method provides an accurate and reliable means for measuring pipe flow rates.
    • The error compensation technique enhances the robustness of the measurement.
    • This method offers improved accuracy compared to previous approaches.