Predictions of muffler performance based on elementary theory (with corrections for intense sound, steady flow, and temperature) agree very closely with measured values, using pure tone excitation. However, muffler performance using tape recorded exhaust noise appears to lie between the values predicted from pure tone and single pulse excitations. An alternate method for rank-ordering of mufflers, using laboratory measurements of A-weighted insertion loss, appears promising. This method uses a simulated exhaust noise, broadcast into the actual exhaust system for a particular vehicle. Effects of intense sound, flow, and temperate are estimated (to a first approximation) from previous research. The A-weighted insertion loss is calculated from frequency spectra recorded with and without the muffler in place.

Media Info

  • Pagination: p. 879-882

Subject/Index Terms

Filing Info

  • Accession Number: 00193811
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: May 26 1979 12:00AM