Modelling roughness of road profiles on parallel tracks using roughness indicators
Artikel i vetenskaplig tidskrift, 2016

The vertical road input is the most important load for durability assessments of vehicles. We focus on stochastic modelling of the parallel road profiles with the aim to find a simple but still accurate model for such bivariate records. A model is proposed that is locally Gaussian with randomly gamma distributed variances leading to a generalised Laplace distribution of the road profile. This Laplace model is paired with the ISO spectrum and is specified by only three parameters. Two of them can be estimated directly from a sequence of roughness indicators, such as IRI or ISO roughness coefficients. The third parameter, needed to define the cross-spectrum between the left and right road profiles, is estimated from the sample correlation. Explicit approximations for the expected fatigue damage for the proposed Laplace-ISO model are developed. The usefulness of the methods is validated using measured road profiles.

Laplace distribution

road irregularity

vehicle durability

fatigue damage

road roughness

Författare

Pär Johannesson

SP Sveriges Tekniska Forskningsinstitut

Krzysztof Podgorski

Lunds universitet

Igor Rychlik

Chalmers, Matematiska vetenskaper, matematisk statistik

Göteborgs universitet

International Journal of Vehicle Design

0143-3369 (ISSN)

Vol. 70 183-210

Styrkeområden

Transport

Ämneskategorier

Tillförlitlighets- och kvalitetsteknik

Sannolikhetsteori och statistik

DOI

10.1504/IJVD.2016.074421