CHARACTERISTIC NOISES OF GOODS VEHICLES

BESONDERE GERAEUSCHE DER NUTZFAHRZEUGE

Measurements carried out on a test rig showed that the rolling noise level of a vehicle with 10 tyres is 30 db(a). A greater number of tyres increases the noise. For a coarse grained rolled asphalt road surface the noise level at 50 km/h is 2 db(a) higher than for a fine grained surface. Crossing small surface irregularities produced an increase of 3 to 4 db(a) almost independently of the vehicle speed. Increasing the axle load from 2.65 t to 6.65 t results in an increase of 1 to 2 db(a). Typical goods vehicle noise is described as rattling caused by impact. Driving over large surface irregularities with an unloaded trailer truck causes lifting at the tow hitch and impact of the ends of the leaf springs against the mountings. In this connection measurements produced maximum noise levels up to 94 db(a). Other peculiar noises originate from the sides of the vehicle body. With undamped leaf springs the rattling of the body work raises the noise level by only 1 to 2 db(a), whereas the difference with damped leaf springs is 5 db(a). Resilient strips between the sliding ends of the leaf spring have two-fold effect, firstly deadening the sound from the springs themselves and also reducing the induced vibrations of the truck body. /TRRL/

  • Availability:
  • Corporate Authors:

    Franckhlsche Verlagshandlung

    Pfizerstrasse 5, Postfach 640
    7000 Stuttgart 1,   Germany 
  • Authors:
    • Gauss, F
    • Jaekel, S
  • Publication Date: 1976-12

Language

  • German

Media Info

  • Features: Figures; References;
  • Pagination: p. 519-521
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00179970
  • Record Type: Publication
  • Source Agency: Federal Institute for Road Research, West Germany
  • Files: ITRD, TRIS
  • Created Date: Sep 27 1978 12:00AM