Fyrhjulsmodeller för bestämning av vägojämnhet: dokumentation av verksamhet på VTI 2002–2011

Identification of road roughness using a fullcar model

In Sweden, longitudinal roughness has been more or less synonymous with the International Roughness Index (IRI), thoroughly described in Sayers [14], Sayers et al. [15] and Sayers et al. [16]. IRI is calculated from a longitudinal profile, and describes the accumulated movement between the wheel and chassis on a quarter-car model. The result is given as this movement divided with the traveled length. In Sweden, the unit millimeters per mere is normally used. The IRI-model is only affected by movements in the vertical direction, and the speed is fixed to 80 km/h. This report presents the work to make a full-car model, with the aim to produce a more realistic view of the movements of a vehicle traveling on a normal road. The benefits with a more realistic vehicle model is that indices with a higher correlation to drivers’ and passengers’ experiences can be made. It should be mentioned that a relatively high correlation between IRI and drivers’ estimates road condition has been shown, see Ihs et al. [11] and Magnusson et al. [13]. A FullCar model should, however, give more detailed information about the effect of the road surface on the vehicle. A truck model could, for example, be used to find sections with a dangerous cross fall. A realistic vehicle model could also be used in studies concerning the deterioration of roads, as the road is partly worn by wheel abrasions and partly deformed by contact forces. A simple model could simulate hundreds of thousands of vehicle passages in only a few minutes.

• Record URL:
  • http://www.vti.se/sv/publikationer/pdf/fyrhjulsmodeller-for-bestamning-av-vagojamnhet.pdf
• 
• Authors:
  • Andrén Peter, Andrén Peter
• Publication Date: 2012

Language

• Swedish

Media Info

• Pagination: 27
• Serial:
  • VTI NOTAT
  • Issue Number: 2012-2
  • Publisher: Swedish National Road and Transport Research Institute (VTI)

Subject/Index Terms

• TRT Terms: Automobiles; Mathematical models; Measurement; Scale models; Smoothness; Surfacing
• ITRD Terms: 1243: Car; 3071: Evenness; 6473: Mathematical model; 6136: Measurement; 6205: Model (not math); 2972: Surfacing
• Subject Areas: Bridges and other structures; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 01558004
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Files: ITRD, VTI
• Created Date: Mar 27 2015 12:03PM