QHV: THE MIRA CONTRIBUTION

The article describes an investigation of MIRA as part of the TRRL GHV programme to reduce internal lorry noise by cab structure modifications. MIRA was required to provide a 3db(a) attenuation of sound level emitted by the power unit and also to control cab noise level. Experiments on Rolls-Royce powered Foden Tractor units showed that cab noise could be reduced by fitting improved exhaust silencers and redesigned engine mounts. Noise reduction by these modifications and also cooling system fan developments are shown graphically. Individual sound pressure level increments attributable to each change in design parameters are discussed. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/SUffolkIP326BW
• Corporate Authors:

  Mechanical Engineering Publications Limited

  P.O. Box 24, Northgate Avenue
  Bury St Edmunds, Suffolk IP32 6BW,   England 
• Authors:
  • West, J
• Publication Date: 1979-6-7

Media Info

• Features: Figures;
• Pagination: p. 15-17
• Serial:
  • AUTOMOTIVE ENGINEER
  • Volume: 4
  • Issue Number: 3
  • Publisher: Institution of Mechanical Engineers
  • ISSN: 0307-6490

Subject/Index Terms

• TRT Terms: Design; Engines; Exhaust pipes; Noise; Noise control; Sound level; Trucks; Vehicle compartments; Vehicle design; Vehicle interiors
• Uncontrolled Terms: Decreases; Interior; Modifications
• Old TRIS Terms: Engine noise
• ITRD Terms: 9009: Decrease; 9011: Design (overall design); 1384: Exhaust pipe; 1377: Interior (veh); 1236: Lorry; 9048: Modification; 6747: Sound level
• Subject Areas: Design; Environment; Highways; Motor Carriers; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00307766
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: SUffolk IP32 6BW
• Files: ITRD, TRIS
• Created Date: Jan 15 1980 12:00AM