Legislation limiting the noise emitted by motor vehicles to specific levels necessitates a means of control and testing. Whereas the internationally accepted "free field" drive by test (iso r362) is acceptable for type testing, it is difficult to find suitable measurement sites in congested urban areas. There is a need for an alternative means of testing which may be applied to vehicles in use. A static run-up test of exhaust noise shows promise in this regard. A relationship has been found between the noise of the exhaust, measured at a distance of 0.3 M and at 10 degrees from the outlet axis, and this 0.3 M noise minus that measured according to iso r362. The nature of this relationship depends upon the type of vehicle, and it is possible to select parameters for the exhaust noise test which will cater for the various differences between vehicle types.(a) /TRRL/

  • Availability:
  • Corporate Authors:

    Technical Publications Limited

    C.P.O. 3047
    Wellington,   New Zealand 
  • Authors:
    • Lister, T A
  • Publication Date: 1976-6


  • English

Media Info

  • Features: Photos; References; Tables;
  • Pagination: p. 165-166
  • Serial:
    • Volume: 31
    • Issue Number: 6
    • Publisher: Institution of Professional Engineers New Zealand
    • ISSN: 0028-808X

Subject/Index Terms

Filing Info

  • Accession Number: 00142476
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Jul 19 1977 12:00AM