A new non-linear impedance model for liners
Keywords:Acoustic fields, Mach number, Nonlinear systems, Porosity, Resonators, Thickness measurement, Nonlinear impedance, Nonlinear resistance, Perforated plate, Resonator geometry
AbstractA 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.
How to Cite
Copyright on articles is held by the author(s). The corresponding author has the right to grant on behalf of all authors and does grant on behalf of all authors, a worldwide exclusive licence (or non-exclusive license for government employees) to the Publishers and its licensees in perpetuity, in all forms, formats and media (whether known now or created in the future)
i) to publish, reproduce, distribute, display and store the Contribution;
ii) to translate the Contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or, abstracts of the Contribution;
iii) to exploit all subsidiary rights in the Contribution,
iv) to provide the inclusion of electronic links from the Contribution to third party material where-ever it may be located;
v) to licence any third party to do any or all of the above.