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Scattering And Absorption of Light in Planetary Regoliths
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Acoustical scattering by multilayer spherical elastic scatterer containing electrorheological layer.

Liang-Wu Cai1, Dacio K Dacol, Gregory J Orris

  • 1Department of Mechanical and Nuclear Engineering, Kansas State University, 3031 Rathbone Hall, Manhattan, Kansas 66506, USA. cai@ksu.edu

The Journal of the Acoustical Society of America
|February 10, 2011
PubMed
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This study introduces a computational method to analyze acoustical scattering from multilayer spheres. Electrorheological (ER) fluid layers offer tunable scattering characteristics, with one fluid significantly increasing scattering cross-section at moderate frequencies.

Area of Science:

  • Acoustics
  • Materials Science
  • Computational Physics

Background:

  • Analyzing acoustical scattering from complex structures is crucial for various applications.
  • Multilayer spherical scatterers with mixed acoustic and elastic properties present unique challenges.
  • Electrorheological (ER) fluids offer tunable properties influenced by electric fields.

Purpose of the Study:

  • To propose and utilize a computational procedure for analyzing acoustical scattering from multilayer concentric spherical scatterers.
  • To investigate the tunability of scattering characteristics using an electrorheological (ER) fluid layer within a spherical scatterer.
  • To numerically explore the impact of different ER fluids on scattering behavior.

Main Methods:

  • Development of a computational procedure for acoustical scattering analysis.

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  • Application of the procedure to a spherical scatterer with a solid shell, solid core, and an ER fluid layer.
  • Numerical analysis of scattering cross-sections for two distinct ER fluids under varying conditions.

    • Main Results:

    • One ER fluid (corn starch in peanut oil) demonstrated a significant increase in scattering cross-section at moderate frequencies.
    • Another ER fluid (PMMA beads in dodecane) showed minimal overall change in scattering cross-sections.
    • A noticeable local resonance peak near ka=1 was observed for thin shells, which could be controlled by an external electric field.

    Conclusions:

    • The proposed computational method effectively analyzes acoustical scattering from complex multilayer spheres.
    • Electrorheological fluids can be utilized to tune the acoustical scattering properties of spherical scatterers.
    • The ability to control resonance peaks with electric fields opens possibilities for novel tunable acoustic devices.