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Related Experiment Videos

Radiation modal expansion: application to active structural acoustic control

Gibbs1, Clark, Cox

  • 1NASA Langley Research Center, Hampton, Virginia 23681-0001, USA.

The Journal of the Acoustical Society of America
|January 21, 2000
PubMed
Summary

This study showcases active structural acoustic control, reducing radiated sound power by 5 dB using adaptive sensors and novel radiation filters. The radiation modal expansion method significantly simplifies filter design for effective noise reduction.

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Area of Science:

  • Acoustics
  • Control Systems Engineering
  • Vibration Analysis

Background:

  • Active structural acoustic control (ASAC) is crucial for noise reduction in various engineering applications.
  • Traditional methods often involve complex modeling of acoustic radiation.
  • Efficient design of control systems requires simplified yet accurate models.

Purpose of the Study:

  • To demonstrate active structural acoustic control using advanced sensoriactuators and feedback.
  • To introduce and validate a new reduced-order modeling technique for radiation filters.
  • To achieve significant reductions in radiated sound power.

Main Methods:

  • Implementation of multiple input/output adaptive sensoriactuators.
  • Development and application of a feedback control paradigm.

Related Experiment Videos

  • Introduction of the radiation modal expansion (RME) technique for reduced-order modeling of radiation filters.

    • Main Results:

    • The RME technique reduced radiation matrix modeling from 400 to 6 transfer functions.
    • Experimental validation demonstrated significant reductions in radiated sound power.
    • Achieved average sound power reduction of approximately 5 dB across a 0-800 Hz bandwidth.

    Conclusions:

    • The presented ASAC approach effectively reduces radiated sound power.
    • The RME method offers a computationally efficient way to design radiation filters.
    • This work provides a practical framework for advanced acoustic control.