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Incipient tip vortex cavitation localization using block-sparse compressive sensing.

Minseuk Park1, Yongsung Park1, Keunhwa Lee2

  • 1Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, 08826, Republic of Korea.

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Summary
This summary is machine-generated.

This study introduces a new method for locating propeller tip vortex cavitation (TVC) using compressive sensing (CS) across multiple frequencies. This advanced technique improves accuracy and reduces data requirements for identifying cavitation sources.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Signal Processing

Background:

  • Propeller tip vortex cavitation (TVC) generates broadband noise from multiple sources near propeller tips.
  • Accurate localization of TVC is crucial for understanding and mitigating its effects.

Purpose of the Study:

  • To develop and demonstrate a compressive sensing (CS)-based technique for localizing propeller tip vortex cavitation (TVC).
  • To enhance TVC localization performance by employing coherent multiple-frequency processing.

Main Methods:

  • Utilized block-sparse compressive sensing (CS) to group and process measurements from multiple frequencies coherently.
  • Applied coherent multiple-frequency processing to jointly analyze data, improving upon single-frequency methods.
  • Validated the approach using experimental data from both transducer and cavitation sources.

Main Results:

  • Coherent multiple-frequency processing significantly improves TVC localization performance compared to single-frequency methods.
  • The proposed CS technique achieves accurate localization without needing numerous frequencies or long-time data.
  • The method is effective even without assuming a single cavitation event or time-invariant signals.

Conclusions:

  • The developed CS-based coherent multiple-frequency processing offers a robust and accurate method for TVC localization.
  • This technique overcomes limitations of conventional CS and single-frequency approaches for cavitation analysis.
  • The findings have implications for underwater acoustics and propeller design.