Title: Model of coherence function of road unevenness in parallel tracks for vehicle simulation

Authors: Peter Múčka

Addresses: Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Račianska 75, SK-831 02 Bratislava 3, Slovak Republic

Abstract: The coherence function between road elevations of two parallel road tracks was identified. In total, 3492 road records were analysed. The mean empirical unbiased squared coherence function was fitted using 11 different analytical models. The best results were obtained for the Ammon and Bormann model and rational function. The goodness-of-fit was markedly improved in comparison with other currently used models (isotropic, exponential, quadratic, etc.). The results distinguish between asphalt concrete and cement concrete road surfaces. The influences of local road features (bumps, potholes, vertical faults, joints, etc.) and the road profile data pre-processing (low pass filtration and sampling interval) on the coherence function were analysed and found to have negligible effect.

Keywords: coherence function; road profile; road unevenness; parallel tracks; roll vibration; vehicle vibration; PSD; power spectral density; LTPP; long term pavement performance; vehicle modelling; uneven roads; simulation; asphalt concrete road surfaces; cement concrete road surfaces; road bumps; potholes; vertical faults; joints.

DOI: 10.1504/IJVD.2015.066480

International Journal of Vehicle Design, 2015 Vol.67 No.1, pp.77 - 97

Received: 26 Apr 2013
Accepted: 15 May 2014
Published online: 22 Dec 2014 *

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