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Numerical Determination of Transfer Impedance for Perforates

Journal Article
2015-01-2312
ISSN: 1946-3995, e-ISSN: 1946-4002
DOI: https://doi.org/10.4271/2015-01-2312
Published June 15, 2015 by SAE International in United States
Numerical Determination of Transfer Impedance for Perforates
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Citation: Wang, P., Li, J., and Wu, T., "Numerical Determination of Transfer Impedance for Perforates," SAE Int. J. Passeng. Cars - Mech. Syst. 8(3):1003-1008, 2015, https://doi.org/10.4271/2015-01-2312.
Language: English

Abstract:

A simplified method to model perforated tubes in mufflers is the equivalent transfer impedance approach. Various empirical formulas that consider the porosity, hole diameter, wall thickness, and flow type have been proposed to date. They normally work very well under the conditions that the formulas are intended for. However, there are situations that the empirical formulas may not be able to cover. In this paper, we propose a simple BEM-based numerical procedure to determine the transfer impedance from a small perforate sample, and then send the transfer impedance to the muffler BEM model for analysis purposes. Numerical results are verified in three test cases.