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Broadband radiation modes: estimation and active control.

Arthur P Berkhoff1

  • 1TNO TPD/University of Twente, The Netherlands. berkhoff@tpd.tno.nl

The Journal of the Acoustical Society of America
|April 5, 2002
PubMed
Summary

This study introduces broadband radiation modes for efficient vibration control. These modes optimize sensor arrays to reduce radiated sound power from vibrating structures.

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Area of Science:

  • Acoustics
  • Vibration Analysis
  • Control Systems Engineering

Background:

  • Efficiently radiating vibration patterns, known as radiation modes, are crucial for understanding and controlling sound emission from vibrating bodies.
  • Current methods often focus on specific frequency ranges, limiting broadband applicability.
  • Reducing controller dimensionality is essential for practical implementation in feedback control systems.

Purpose of the Study:

  • To formulate broadband radiation modes in the time domain for efficient vibration control.
  • To develop methods for obtaining these modes from measured data.
  • To design and compare actuator array strategies for reducing radiated sound power from a plate using broadband radiation modes.

Main Methods:

  • Formulation of broadband radiation modes in the time domain.
  • Extraction of modes from measured vibration data.
  • Design and comparison of three actuator array strategies for feedback control.

Main Results:

  • The proposed broadband radiation modes enable efficient weighting schemes for sensor arrays.
  • The methods allow for the determination of these modes from experimental measurements.
  • Actuator designs were evaluated based on radiated sound power reduction across controlled and uncontrolled frequency ranges.

Conclusions:

  • Broadband radiation modes offer an optimal approach for controlling radiated sound power over a wide frequency range.
  • The developed methods facilitate the practical application of these modes in vibration control systems.
  • Careful actuator design is necessary to balance sound power reduction in target bands with potential increases in other bands.

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