Load effect on source impedance measurement accuracy

J. Liu, D. W. Herrin

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations


The source in an intake/exhaust system is commonly modeled as a source strength and impedance combination. Both the strength and impedance are normally measured and measurement accuracy depends on selecting an appropriate acoustic load combination. An incident wave decomposition method is proposed which is based on acoustic wave decomposition concepts instead of an electric circuit analogy providing a more straightforward approach to investigating the effect of acoustic load selection. Based on studying wave reflections in the system, the uncertainty for determining source impedance is estimated.

Original languageEnglish
JournalSAE Technical Papers
StatePublished - 2009
EventSAE 2009 Noise and Vibration Conference and Exhibition, NVC 2009 - St. Charles, IL, United States
Duration: May 19 2009May 19 2009

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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