Numerical Determination of Transfer Impedance for Perforates
Numerical Determination of Transfer Impedance for Perforates
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.
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Numerical Determination of Transfer Impedance for Perforates
Sae International Journal of Passenger Cars. Mechanical Systems
Sae Int. J. Passeng. Cars - Mech. Syst
SAE 2015 Noise and Vibration Conference and Exhibition ; 2015
Sae International Journal of Passenger Cars - Mechanical Systems ; 8 , 3 ; 1003-1008
2015-06-15
6 pages
Conference paper
English
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