Numerical Determination of Transfer Impedance for Perforates

P. Wang, J. Li, T. W. Wu

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)1003-1008
Number of pages6
JournalSAE International Journal of Passenger Cars - Mechanical Systems
Issue number3
StatePublished - Jun 15 2015

Bibliographical note

Publisher Copyright:
Copyright © 2015 SAE International.

ASJC Scopus subject areas

  • Modeling and Simulation
  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Mechanical Engineering


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