• Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

You are not logged in You are logged out of this journal. Log In

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

Active acoustical impedance using distributed electrodynamical transducers

J. Acoust. Soc. Am. Volume 125, Issue 2, pp. 882-894 (2009); (13 pages)

M. Collet, P. David, and M. Berthillier

FEMTO-ST, DMA, CNRS UMR 6604, University of Franche-Comté, 24 Chemin de l’Épitaphe, 25000 Besançon, France

Full Text: Read Online (HTML) | Download PDF | Buy PDF (US$30) | View Cart
New miniaturization and integration capabilities available from emerging microelectromechanical system (MEMS) technology will allow silicon-based artificial skins involving thousands of elementary actuators to be developed in the near future. SMART structures combining large arrays of elementary motion pixels coated with macroscopic components are thus being studied so that fundamental properties such as shape, stiffness, and even reflectivity of light and sound could be dynamically adjusted. This paper investigates the acoustic impedance capabilities of a set of distributed transducers connected with a suitable controlling strategy. Research in this domain aims at designing integrated active interfaces with a desired acoustical impedance for reaching an appropriate global acoustical behavior. This generic problem is intrinsically connected with the control of multiphysical systems based on partial differential equations (PDEs) and with the notion of multiscaled physics when a dense array of electromechanical systems (or MEMS) is considered. By using specific techniques based on PDE control theory, a simple boundary control equation capable of annihilating the wave reflections has been built. The obtained strategy is also discretized as a low order time-space operator for experimental implementation by using a dense network of interlaced microphones and loudspeakers. The resulting quasicollocated architecture guarantees robustness and stability margins. This paper aims at showing how a well controlled semidistributed active skin can substantially modify the sound transmissibility or reflectivity of the corresponding homogeneous passive interface. In Sec. 4, numerical and experimental results demonstrate the capabilities of such a method for controlling sound propagation in ducts. Finally, in Sec. 5, an energy-based comparison with a classical open-loop strategy underlines the system’s efficiency.

© 2009 Acoustical Society of America

Article Outline

  1. INTRODUCTION
  2. TOTAL ABSORPTION OF ACOUSTIC WAVES
    1. Introduction
    2. The control problem
    3. Definition of the control
  3. TRANSMISSIBILITY CONTROL IN THE TUBE
    1. Problem synthesis
    2. Control strategy
  4. NUMERICAL AND EXPERIMENTAL QUALIFICATIONS OF THE METHOD: APPLICATION TO THE TRANSMISSIBILITY CONTROL IN A TUBE
    1. Description of the studied system
    2. Modeling the control loudspeakers and fluid-structure interaction
    3. Implementation of a discrete form of the control equation
    4. Numerical results
    5. Experimental results
  5. COMPARISON WITH AN OPEN-LOOP CONTROL ALGORITHM
  6. CONCLUSION

RELATED DATABASES

To view database links for this article, you need to log in.

KEYWORDS and PACS

Keywords

acoustic impedance, acoustic transducer arrays, intelligent structures, micromechanical devices, noise abatement, partial differential equations

PACS

ARTICLE DATA

History
Received 05 Jan 2007
Accepted 23 Oct 2008
Revised 30 May 2008
Digital Object Identifier
http://dx.doi.org/10.1121/1.3026329

PUBLICATION DATA

ISSN

0001-4966 (print)  

Publisher

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

For access to fully linked references, you need to log in.

For access to citing articles, you need to log in.


Figures (22)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)



Close

Your Recent History Recent History Help

Recently Viewed

  1. Active acoustical impedance using distributed electrodynamical transducers
  2. Demonstration of a wireless, self-powered, electroacoustic liner system
  3. Green's function approximation from cross-correlations of 20–100 Hz noise during a tropical storm
  4. Correction techniques for the truncation of the source field in acoustic analogies
  5. Source localization from an elevated acoustic sensor array in a refractive atmosphere

Home Publications Meetings Contact ASA Site Map Back to Top

Copyright © Acoustical Society of America

close