The noise emitted by motor vehicles today, when they are operating in such a manner that the maximum permitted sound levels are approached, is dominated by the contributions made by the engine, the intake and the exhaust. As and if the maximum permitted noise levels are reduced, and in the case of operation in service below the maximum power of the vehicles, a point will be reached where a significant contribution to the total noise is made by the rolling of the tyre on the road and the passage of the vehicle through the atmosphere. It is therefore of interest to determine current levels of "coasting" noise when no propulsive power is being applied to the vehicle. A knowledge of coasting noise levels is important in determining the lowest "construction" noise levels can be achieved by reductions of propulsion noise alone, it is also import in considering the relationship between "construction" levels and "use" levels since coasting noise is speed dependant and, with the introduction of urban motorways, road speeds well above 50 km/h will occur in urban areas. (Author)

  • Corporate Authors:

    Motor Industry Research Association

    Lindley Near Nuneaton
    Warwickshire,   England 
  • Authors:
    • Mills, CHG
  • Publication Date: 1970-5

Media Info

  • Features: Figures;
  • Pagination: p. 16-18
  • Serial:
    • MIRA Bulletin
    • Issue Number: 3
    • Publisher: Motor Industry Research Association

Subject/Index Terms

Filing Info

  • Accession Number: 00261299
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 22 1974 12:00AM