THE TRRL QUIET HEAVY VEHICLE PROJECT

METODI E STRUMENTAZIONI PER MISURE DI CONSUMO CARBURANTE

The paper presents the results of the TRRL quiet heavy vehicle (qhv) project. The project was aimed at demonstrating that diesel-engined articulated vehicles could be produced with external noise levels of 10 db(a) lower than 1971 values or down to about 80 db(a). The project also attempted to indicate the relationship between cost and noise level. Two vehicles were selected for the project, A leyland at 32 t gross vehicle weight and 212 bhp, and A foden rolls royce capable of operating at higher gvw with engine power of 350 bhp. Results show the reduction in external and internal noise achieved with the isvr rolls royce 'research' engine and full enclosure. The exhaust system noise was reduced by isvr and mira to 71 db(a) and 92 db(c). Tyre noise was studied at TRRL to evaluate the mechanism of tyre noise and to specify a tyre design which would meet the 77 db(a) noise level in wet or dry conditions. (TRRL)

  • Availability:
  • Supplemental Notes:
    • National Society for Clean Air Workshop on Pollution from Road Vehicles, University of Warwick, April 9-11, 1979.
  • Corporate Authors:

    NATIONAL SOCIETY FOR CLEAN AIR

    136 NORTH STREET
    BRIGHTON,   United Kingdom  BN1 1RG
  • Authors:
    • Tyler, J W
  • Publication Date: 1979

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00319580
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: Monograph
  • Files: ITRD, TRIS
  • Created Date: Feb 6 1996 12:00AM