A new non-linear impedance model for liners

Authors

  • A. Touchais Dept. of Mechanical Engineering, University of Sherbrooke, Que. J1K2R1, Canada
  • N. Atalla Dept. of Mechanical Engineering, University of Sherbrooke, Que. J1K2R1, Canada
  • R. Panneton Dept. of Mechanical Engineering, University of Sherbrooke, Que. J1K2R1, Canada

Keywords:

Acoustic fields, Mach number, Nonlinear systems, Porosity, Resonators, Thickness measurement, Nonlinear impedance, Nonlinear resistance, Perforated plate, Resonator geometry

Abstract

A non-linear impedance model for linear part, the proposed non-linear resistance, and frequency shift effects is presented that allows simulations of various perforated plate configurations. The model considers only the effects of resonator geometry and incident sound pressure amplitude according to frequency. The perforated plate used in the experiment has a perforation diameter of 1mm, porosity of 4.5%, a thickness of 2mm, and a cavity depth of 25mm. It was seen that the absorption's maxima increases with SPL and shifts towards high frequency. The radius and thickness of the perforations are modified as a function of the acoustical Mach number. The results show that the effective radius and thickness if the perforations decrease at high SPL and the corrections are added to the Ma's model for the linear component of the impedance and Melling's model for the nonlinear effects on the resistance.

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Published

2007-09-01

How to Cite

1.
Touchais A, Atalla N, Panneton R. A new non-linear impedance model for liners. Canadian Acoustics [Internet]. 2007 Sep. 1 [cited 2021 Nov. 26];35(3):98-9. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1919

Issue

Section

Proceedings of the Acoustics Week in Canada

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