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Journal of the Acoustical Society of America / Volume 125 / Issue 2 / NOISE: ITS EFFECTS AND CONTROL [50]

Demonstration of a wireless, self-powered, electroacoustic liner system a

a Preliminary portions of this work were presented in “A self-powered wireless active acoustic liner,” 12th AIAA/CEAS Aeroacoustics Conference, Cambridge, MA, May 2006, AIAA Paper No. 2006-2400 and “Technology development for electromechanical acoustic liners,” Active 04, Williamsburg, VA, May 2004.

J. Acoust. Soc. Am. Volume 125, Issue 2, pp. 873-881 (2009); (9 pages)

Alex Phipps1, Fei Liu2, Louis Cattafesta2, Mark Sheplak2, and Toshikazu Nishida1

1Department of Electrical and Computer Engineering, University of Florida, Gainesville, Florida 32611-6130
2Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611-6250

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This paper demonstrates the system operation of a self-powered active liner for the suppression of aircraft engine noise. The fundamental element of the active liner system is an electromechanical Helmholtz resonator (EMHR), which consists of a Helmholtz resonator with one of its rigid walls replaced with a circular piezoceramic composite plate. For this system demonstration, two EMHR elements are used, one for acoustic impedance tuning and one for energy harvesting. The EMHR used for acoustic impedance tuning is shunted with a variable resistive load, while the EMHR used for energy harvesting is shunted to a flyback power converter and storage element. The desired acoustic impedance conditions are determined externally, and wirelessly transmitted to the liner system. The power for the receiver and the impedance tuning circuitry in the liner are supplied by the harvested energy. Tuning of the active liner is demonstrated at three different sound pressure levels (148, 151, and 153 dB) in order to show the robustness of the energy harvesting and storage system. An acoustic tuning range of approximately 200 Hz is demonstrated for each of the three available power levels.

© 2009 Acoustical Society of America

ACKNOWLEDGMENTS

Financial support for this project is provided by the NASA Langley Research Center (Grant No. NAG-1-2261), monitored by Mr. Michael G. Jones. The authors gratefully acknowledge the contributions of Dr. Khai Ngo, Selvi Kadirvel, and Robert Taylor in helpful discussions and suggestions during this work.

Article Outline

  1. INTRODUCTION
  2. EMHR-ARRAY ACTIVE LINER SYSTEM
    1. Impedance tuning block
    2. Energy harvesting block
    3. Wireless communication block and system integration
  3. EXPERIMENTAL SETUP
  4. EXPERIMENTAL VERIFICATION AND RESULTS
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

acoustic impedance, acoustic resonators, acoustoelectric devices, direct energy conversion, noise abatement, piezoceramics, piezoelectric devices

PACS

  • 43.50.Gf

    Noise control at source: redesign, application of absorptive materials and reactive elements, mufflers, noise silencers, noise barriers, and attenuators, etc.

  • 43.38.Fx

    Piezoelectric and ferroelectric transducers

  • 43.55.Ev

    Sound absorption properties of materials: theory and measurement of sound absorption coefficients; acoustic impedance and admittance

ARTICLE DATA

History
Received 19 Feb 2008
Accepted 21 Nov 2008
Revised 24 Oct 2008
Permalink
http://dx.doi.org/10.1121/1.3050287

PUBLICATION DATA

ISSN:

0001-4966 (print)  

Publisher:

$abstract.society.value is a Member of CrossRef Acoustical Society of America

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