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Multivariable feedback active structural acoustic control using adaptive piezoelectric sensoriactuators

J S Vipperman1, R L Clark

  • 1Department of Mechanical Engineering, University of Maine, Orono 04401-5711, USA.

The Journal of the Acoustical Society of America
|January 28, 1999
PubMed
Summary

This study demonstrates active structural acoustic control using piezoelectric sensoriactuators to reduce radiated sound power by up to 15 dB. The system balances control effort with sound power reduction for enhanced performance.

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Area of Science:

  • Acoustic Engineering
  • Control Systems
  • Materials Science

Background:

  • Active structural acoustic control (ASAC) aims to reduce noise radiated from vibrating structures.
  • Piezoelectric materials offer integrated sensing and actuation capabilities for ASAC.
  • Optimizing control laws requires accurate modeling of acoustic radiation.

Purpose of the Study:

  • To experimentally implement and validate a multivariable feedback ASAC system.
  • To minimize total radiated sound power from a piezostructure plate.
  • To balance control effort with acoustic performance.

Main Methods:

  • Utilized four adaptive piezoelectric sensoriactuators as colocated actuator/sensor pairs.
  • Developed radiation filters based on structure radiation efficiencies.

Related Experiment Videos

  • Incorporated filters into an H2 control law minimizing radiated sound power and control effort.
  • Employed a similarity transform for generalized velocity states.

    • Main Results:

    • Achieved up to 15 dB attenuation in radiated sound power at resonant frequencies.
    • Demonstrated effective balancing of control effort and sound power reduction.
    • Validated the experimental implementation of the proposed ASAC system.

    Conclusions:

    • The demonstrated multivariable feedback ASAC system effectively reduces radiated sound power.
    • The developed radiation filters and H2 control law are crucial for performance.
    • This approach shows significant potential for noise control in vibrating structures.