An account is given of the TRRL quiet heavy vehicle (qhv) project in which the drive-by noise level of a 238 kw (320 bhp) Rolls-Royce Engined Foden Tractor was reduced to 81 db(a). It is thought likely that a noise level of 88 db(a) will be required by 1982 in the eec with a proposed target of 80 db(a) by 1985. The method used to reduce sound emissions was by means of structural changes to the vehicle cab and the provision of a structural enclosure around the engine and transmission. The cooling system was totally ducted using a mixed-flow fan while the reactive silencer system was built to a mira design consisting of two cylindrical boxes with a total volume of 186 litres. /TRRL/

  • Availability:
  • Corporate Authors:

    Institution of Mechanical Engineers

    1 Birdcage Walk
    London SW1H 9JJ,   England 
  • Publication Date: 1979-2-3

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: p. 23-5
  • Serial:
    • Volume: 4
    • Issue Number: 1
    • Publisher: Institution of Mechanical Engineers
    • ISSN: 0307-6490

Subject/Index Terms

Filing Info

  • Accession Number: 00194994
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jul 11 1979 12:00AM