CAR NOISE CAN BE CUT BY MANY DECIBELS BY ADDITIONAL INSULATION

MAANGA DECIBEL BILBULLER KAN SPARAS GENOM TILLAEGGSISOLERING

Some cars are like sounding boxes, and generate noise both outside and inside the passenger compartment. Using the correct techniques and correct materials, however, noise can be cut by many db by applying extra insulation and damping on different parts of the bodywork. Improvements range from 2 to 20 db(a); already 5 db(a) produces a pronounced improvement. The main source of noise is the engine which creates airborne noise as well as unbalanced forces and pulsation which are transmitted to the body through mountings. Tyres create a loud airborne noise. On an existing car, noise can be counteracted by (1) damping the source, (2) placing a sound-proof partition between source and receiver, (3) absorption along channels and in cavities. Doors and sides can be sound-proofed using self-adhesive bitumenised foil or felt. The boot and rear windows must also be treated. The floor and transmission tunnel should have soft foam plastics plus bitumenised foil. The back of the engine compartment and wheel arches must have special attention. The roof should have foam plastics between the metal and upholstery. Holes and gaps must be sealed. The best results are achieved by a 3-layer system comprising felt, sandwich insulation and then a foil. (TRRL)

  • Corporate Authors:

    Swedish National Association for Motor Trades

    Karlavaegen 14A, Box 5611
    S-11486 Stockholm,   Sweden 
  • Publication Date: 1979

Language

  • Swedish

Media Info

  • Features: Figures;
  • Pagination: p. 20-21
  • Serial:
    • Motorbranschen
    • Volume: 40
    • Issue Number: 6
    • Publisher: Motorbranschen Foerlag

Subject/Index Terms

Filing Info

  • Accession Number: 00311249
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Files: ITRD, TRIS
  • Created Date: Jun 26 1980 12:00AM