Affiliations: Kaňkovského 1241/2, CZ-182 00, Prague 8, Czech
Republic | Institute of Materials and Machine Mechanics, Slovak
Academy of Sciences, Račianska 75, SK-831 02 Bratislava 3, Slovak
Republic
Abstract: A novel approach to the road unevenness classification based on the
power spectral density with consideration of vehicle vibration response and
broad interval of road waviness (road elevation PSD slope) is presented. This
approach enables transformation of two basic parameters of road profile
elevation PSD (unevenness index, C, and waviness,
w) into a single-number indicator C_{w} when using a correction
factor K_{w}
accounting for w. For the road classification proposal two
planar vehicle models (passenger car and truck), ten responses (reflecting ride
comfort, dynamic load of road and cargo, ride safety) and three different
vehicle velocities have been considered. The minimum of ten estimated vibration
response ranges sum for a broad waviness interval typical for real road
sections (w = 1.5 to 3.5) has been used for the correction
factor estimation. The introduced unevenness indicator, C_{w},
reflects the vehicle vibration response and seems to be a
suitable alternative to the other currently used single-number indicators or as
an extension of the road classification according to the ISO 8608: 1995, which
is based on constant waviness value, w = 2.
Keywords: Road profile, waviness, unevenness index, power spectral density (PSD), International Roughness Index (IRI), half-car model, vibration response, road-vehicle interaction
