An overview of various new road profile quality evaluation criteria: part 2

Abstract

This is the second part of an article which correlates road-induced impacts on vehicle to a selection of road assessment criteria. The impacts on tyre, suspension and radiator wear are studied by running a multibody semi-trailer truck model on 270 road profiles. The model accurateness is assessed by comparing international roughness index (IRI) -impact relationships to those published in the literature. A new profile rating method uses wavelength content to predict the impacts of a specific profile on driver and passenger health and safety, truck wear and fuel consumption. It is concluded that (1) medium wavelengths severely impact fuel consumption, component wear and safety; (2) simple, two-point and four-point indices yield similar results, but the more the points the better the correlation; (3) the IRI is good at predicting general trends in road-induced vehicular impact but is weak for specific impacts and (4) tyre wear correlates linearly while component wear requires quadratic correlations.

Relation Between Seated Person Vibrations and the International Roughness Index

“…ISO 2631-1 specified for the feet vibration of a seated person, that is, the vehicle cab floor, the same filer W k in the vertical ( z -) axis. Gagnon et al ( 24 ) confirmed Equation 4 and stated that the ratio of the ISO-weighted acceleration at the floor of the reference quarter-car simulation model traveling at 100 km/h to the IRI was a linear monomial with a slope coefficient between 0.16 and 0.19.…”

Current approaches to quantify the longitudinal road roughness

“…In contrast, the factor vehicle type was shown to exert a reasonable influence on all roughness indexes (IRI, Half-car IRI and FRI). Gagnon et al (2014Gagnon et al ( , 2015 compared the results for IRI, Half-car IRI, FRI and vibration response on a tractortrailer model. Reza et al (2005) presented development of a new performance index for pavements that incorporates aspects of ride quality together with surface distress, for possible adoption by Ohio Department of Transportation.…”

“…A linear combination of the RIF from different speed bands produces a time-wavelength-intensity transform (TWIT) that, unlike the IRI, is wavelength-unbiased. Gagnon et al (2014Gagnon et al ( , 2015 compared 19 road roughness indexes and vibration response on the truck-trailer model. All evaluated road indexes were based on the reference QCM intended for IRI simulation.…”