Flat sources for active acoustic shielding based on distributed control of a vibrating plate coupled with a thin cavity

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Abstract

Air cavities between plates are often used to improve noise insulation by passive means, especially at high frequencies. Such configurations may suffer from resonances, such as due to the mass-air-mass resonance. Lightweight structures, which tend to be undamped, may suffer from structural resonances as well. Active methods have been suggested for improved noise insulation of plates, using piezoelectric patch actuators or inertial mass actuators. Other active methods for improved noise insulation can be based on acoustic control of the sound field in the cavity, using acoustic sources and acoustic sensors. Methods based on feedforward control of the sound radiated from such panels with air cavity usually suffer from an irregular frequency response of the actuators on the radiating panel and insufficient acoustic control authority at low frequencies. This paper presents a method to realize the combination of the air cavity and a radiating surface with a well controlled vibration distribution over the radiating surface. A specific distributed controller results in a smooth and well defined frequency response over a broad frequency range, enabling effective feedforward control of the radiated sound. Experimental results agree with numerical predictions.
Original languageEnglish
Title of host publicationProceedings Internoise 2013
Place of PublicationInnsbruck
PublisherINCE
Pages1-6
Publication statusPublished - 15 Sep 2013

Publication series

Namepaper no 0275
PublisherINCE

Fingerprint

shielding
cavities
acoustics
insulation
feedforward control
actuators
frequency response
air
air masses
sound fields
controllers
frequency ranges
low frequencies
vibration
sensors
configurations
predictions

Keywords

  • METIS-308937
  • IR-94028

Cite this

Berkhoff, A. P., & Ho, J. (2013). Flat sources for active acoustic shielding based on distributed control of a vibrating plate coupled with a thin cavity. In Proceedings Internoise 2013 (pp. 1-6). (paper no 0275). Innsbruck: INCE.
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abstract = "Air cavities between plates are often used to improve noise insulation by passive means, especially at high frequencies. Such configurations may suffer from resonances, such as due to the mass-air-mass resonance. Lightweight structures, which tend to be undamped, may suffer from structural resonances as well. Active methods have been suggested for improved noise insulation of plates, using piezoelectric patch actuators or inertial mass actuators. Other active methods for improved noise insulation can be based on acoustic control of the sound field in the cavity, using acoustic sources and acoustic sensors. Methods based on feedforward control of the sound radiated from such panels with air cavity usually suffer from an irregular frequency response of the actuators on the radiating panel and insufficient acoustic control authority at low frequencies. This paper presents a method to realize the combination of the air cavity and a radiating surface with a well controlled vibration distribution over the radiating surface. A specific distributed controller results in a smooth and well defined frequency response over a broad frequency range, enabling effective feedforward control of the radiated sound. Experimental results agree with numerical predictions.",
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Berkhoff, AP & Ho, J 2013, Flat sources for active acoustic shielding based on distributed control of a vibrating plate coupled with a thin cavity. in Proceedings Internoise 2013. paper no 0275, INCE, Innsbruck, pp. 1-6.

Flat sources for active acoustic shielding based on distributed control of a vibrating plate coupled with a thin cavity. / Berkhoff, Arthur P.; Ho, J.

Proceedings Internoise 2013. Innsbruck : INCE, 2013. p. 1-6 (paper no 0275).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

TY - GEN

T1 - Flat sources for active acoustic shielding based on distributed control of a vibrating plate coupled with a thin cavity

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N2 - Air cavities between plates are often used to improve noise insulation by passive means, especially at high frequencies. Such configurations may suffer from resonances, such as due to the mass-air-mass resonance. Lightweight structures, which tend to be undamped, may suffer from structural resonances as well. Active methods have been suggested for improved noise insulation of plates, using piezoelectric patch actuators or inertial mass actuators. Other active methods for improved noise insulation can be based on acoustic control of the sound field in the cavity, using acoustic sources and acoustic sensors. Methods based on feedforward control of the sound radiated from such panels with air cavity usually suffer from an irregular frequency response of the actuators on the radiating panel and insufficient acoustic control authority at low frequencies. This paper presents a method to realize the combination of the air cavity and a radiating surface with a well controlled vibration distribution over the radiating surface. A specific distributed controller results in a smooth and well defined frequency response over a broad frequency range, enabling effective feedforward control of the radiated sound. Experimental results agree with numerical predictions.

AB - Air cavities between plates are often used to improve noise insulation by passive means, especially at high frequencies. Such configurations may suffer from resonances, such as due to the mass-air-mass resonance. Lightweight structures, which tend to be undamped, may suffer from structural resonances as well. Active methods have been suggested for improved noise insulation of plates, using piezoelectric patch actuators or inertial mass actuators. Other active methods for improved noise insulation can be based on acoustic control of the sound field in the cavity, using acoustic sources and acoustic sensors. Methods based on feedforward control of the sound radiated from such panels with air cavity usually suffer from an irregular frequency response of the actuators on the radiating panel and insufficient acoustic control authority at low frequencies. This paper presents a method to realize the combination of the air cavity and a radiating surface with a well controlled vibration distribution over the radiating surface. A specific distributed controller results in a smooth and well defined frequency response over a broad frequency range, enabling effective feedforward control of the radiated sound. Experimental results agree with numerical predictions.

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Berkhoff AP, Ho J. Flat sources for active acoustic shielding based on distributed control of a vibrating plate coupled with a thin cavity. In Proceedings Internoise 2013. Innsbruck: INCE. 2013. p. 1-6. (paper no 0275).