ACOUSTICAL AND GAS DYNAMICAL INVESTIGATIONS ON EXHAUST SYSTEMS TO GET FURTHER KNOWLEDGE ON THE SOUND GENERATION MECHANISM OF ABNORMAL EXHAUST NOISE

The sound generated in the passenger compartment of an automobile is an essential criterion of driving comfort. In this paper an analytical method is presented for getting further information on the sound generation mechanism of abnormal exhaust noise. There was a serious problem with the muffler system of a 2-litre engined car. At first acoustical and modal analytical investigations are described, as well as some gas dynamical calculation. The paper describes the sound generation mechanism at gas dynamical stimulation. Possibilities of reducing the sound levels are shown and the problems of the supplementary detuning of the exhaust system are described. In the last part a new method to find the best position of the mufflers in a 3-muffler-exhaust system is presented. (A) For the covering abstract see IRRD 875003.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 218-23

Subject/Index Terms

Filing Info

  • Accession Number: 00717963
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 7-80003-310-4
  • Files: ITRD
  • Created Date: Mar 20 1996 12:00AM