The Acoustic Impedance of a Vibrating Annular Piston Located on a Flat Rigid Baffle Around a Semi-Infinite Circular Rigid Cylinder

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Authors

  • Wojciech P. RDZANEK Department of Acoustics, Institute of Physics, University of Rzeszów,
  • Witold J. RDZANEK Department of Acoustics, Institute of Physics, University of Rzeszów,
  • Dawid PIECZONKA Stylem

Abstract

The axisymmetric problem of acoustic impedance of a vibrating annular piston embedded into a flat rigid baffle concentrically around a semi-infinite rigid cylindrical circular baffle has been undertaken in this study. The Helmholtz equation has been solved. The Green’s function valid for the zone considered has been used for this purpose. The influence of the semi-infinite cylindrical baffle on the piston’s acoustic impedance has been investigated. The acoustic impedance has been presented in both forms: integral and asymptotic, both valid for the steady harmonic vibrations. Additionally, the acoustic impedances of the piston with and without the cylindrical baffle have been compared to one another. In the case without the cylindrical baffle some earlier results have been used.

Keywords:

Neumann boundary value problem, annular piston, acoustic impedance, semi-infinite cylin- drical circular rigid baffle