Comparing Road Profiles with Vehicle Perceived Roughness

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Author(s): Kjell Ahlin, Johan Granlund, Fredric Lindström
Title: Comparing Road Profiles with Vehicle Perceived Roughness
Journal: International Journal of Vehicle Design
Year: 2004
Volume: 36
Issue: 2-3
Pagination: 270-286
ISSN: 0143-3369
Publisher: Inderscience Enterprises
City: Geneva, Switzerland
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Mechanical Engineering (Sektionen för ingenjörsvetenskap - avd. för maskinteknik)
School of Engineering S- 371 79 Karlskrona, School of Engineering S- 371 79 Karlskrona
+46 455 38 50 00
Language: English
Abstract: Accurate road profiles are useful in vehicle design, such as for simulation of durability and ride quality. Laser/inertial profilometers typically record I mm wide profiles. The question is how well such a profile matches perceived vehicle wheel roughness. The objective here was to create a more representative wheel track longitudinal profile. Simulated and measured wheel vibration was compared on a 6km long road. Simulations were made for several definitions of the profile. Results for single laser sensor profiles showed reasonable likeness to truck perceived roughness. By far the best likeness (14.5% better) was achieved when the profile was based on triangular 25%-50%-25% weighted data from three sensors in the wheel track. Clearly, vehicle engineers can benefit from using multiple laser profile sensors, instead of a single sensor. This will improve test accuracy, thus reducing vehicle design project lead times and costs.
Subject: Mechanical Engineering\Structural Dynamics
Keywords: footprint, laser sensors, perceived roughness, profilometer, road profile