Modelling of road profiles using roughness indicators
Journal article, 2014

The vertical road input is the most important load for durability assessments of vehicles. We focus on stochastic modelling of the road profile with the aim to find a simple but still useful model. The proposed nonstationary Laplace model with ISO spectrum has only two parameters, and can be efficiently estimated from a sequence of roughness indicators, such as IRI or ISO roughness coefficient. Thus, a road profile can be stochastically reconstructed from roughness indicators. Further, explicit approximations for the fatigue damage due to Laplace roads are developed. The usefulness of the proposed Laplace-ISO model is validated for eight measured road profiles.

fatigue damage

ISO spectrum

road surface profile

road irregularity

non-Gaussian process

international roughness index

Laplace process



vehicle durability

road roughness coefficient

power spectral density


Pär Johannesson

SP Sveriges Tekniska Forskningsinstitut AB

Igor Rychlik

University of Gothenburg

Chalmers, Mathematical Sciences, Mathematical Statistics

International Journal of Vehicle Design

0143-3369 (ISSN)

Vol. 66 4 317-346

Subject Categories

Mechanical Engineering

Reliability and Maintenance

Areas of Advance




More information

Latest update

9/6/2018 1