Noise levels in commercial vehicle cabs have been reduced to safe, although not altogether comfortable levels. The article summarises the methods of application of well proven techniques to reduce noise levels in a steel cabbed Foden Fleetmaster. Initial measurements were made with the cab trim and seats removed. Noise measurements from a 0.4 M cubic matrix were analysed using a 1/3 octave bandwidth. First results, with the vehicle stationary and the engine running at a high idle, indicate the noisiest area of the cab which is then investigated by a detailed search. Treatment was then applied to the noisiest area and the process repeated. Various treatments were successively applied to reduce the noise from about 89 dba to 74.5 dba at the driver's ear position without any trim. Refitting the headlining and extensive treatment of the front baulkhead produced a further lowering of the noise level to 75.8 dba rising to 77.5 dba under maximum acceleration conditions. /TRRL/

  • Corporate Authors:

    Trade and Technical Press, Limited

    Crown House
    Morden, Surrey SM4 5EW,   England 
  • Authors:
    • Lewis, R P
    • COLLINS, J F
  • Publication Date: 1978-11-12

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00195528
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1979 12:00AM