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Fabrication and Characterization of Thickness Mode Piezoelectric Devices for Atomization and Acoustofluidics
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A real-time plane-wave decomposition algorithm for characterizing perforated liners damping at multiple mode

Dan Zhao1

  • 1Acoustics Laboratory, Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom. zhaodan@ntu.edu.sg

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Summary

A new real-time algorithm accurately measures the acoustic damping of perforated liners, enabling faster tracking of combustion system stability even with changing frequencies.

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Area of Science:

  • Acoustics
  • Combustion Dynamics
  • Signal Processing

Background:

  • Perforated liners are crucial for stabilizing combustion systems by damping acoustic waves.
  • The power absorption coefficient quantifies liner damping, requiring plane wave decomposition.
  • Current methods for characterization can be slow and less adaptable to dynamic changes.

Purpose of the Study:

  • To develop and evaluate a real-time algorithm for decomposing plane waves.
  • To enable online, continuous characterization of acoustic damping in perforated liners.
  • To compare the real-time algorithm's performance against established industry techniques.

Main Methods:

  • A novel real-time algorithm was developed for online plane wave decomposition at multiple frequencies.
  • The algorithm was validated in a numerical model with two unstable modes.
  • Experimental implementation was performed in an acoustically driven pipe with a lined section.

Main Results:

  • The real-time algorithm successfully decomposed plane waves and characterized acoustic damping continuously.
  • Faster tracking of liner damping was observed compared to short-time FFT-based techniques.
  • The algorithm demonstrated effectiveness even when the forcing frequency was abruptly altered.

Conclusions:

  • The developed real-time algorithm offers a significant advancement for characterizing acoustic damping in combustion systems.
  • This method provides faster and more dynamic insights into liner performance.
  • The algorithm shows potential for improved real-time monitoring and control of combustion stability.