Title: Profiling of rough terrain
Authors: Carl Martin Becker; Pieter Schalk Els
Addresses: Aeronautical and Mechanical Engineering, University of Pretoria, Private Bag X20, Hat?eld 0028, South Africa ' Aeronautical and Mechanical Engineering, University of Pretoria, Private Bag X20, Hat?eld 0028, South Africa
Abstract: This study concentrates on obtaining profiles of rough terrain suitable for vehicle dynamics simulations in a cost-effective manner. Commercially available inertial profilometers are unable to profile the terrains of interest due to their severe roughness. A mechanical profilometer is developed and evaluated by profiling obstacles with known profiles, as well as rough 3-D test track profiles. A good correlation between the profiled and actual terrains is achieved. Realistic three-dimensional (3-D) terrain models are generated from the terrain profiles. The Displacement Spectral Densities (DSDs) of the profiled terrains are found to contain discrete peaks; a straight line fit would not be an accurate estimation for the specific rough terrains. Comparisons between the terrains defined in the International Roughness Index (IRI) and the present study indicate that the roughness index of the terrains profiled with the mechanical profilometer is significantly higher than the terrains normally profiled by inertial profilometers.
Keywords: pro?lometry; rough terrain; DSD; displacement spectral densities; 3D pro?les; IRI; international roughness index; RMS; root mean square; photogrammetry; laser scanning; terrain roughness; terrain profiles; vehicle dynamics; simulation.
International Journal of Vehicle Design, 2014 Vol.64 No.2/3/4, pp.240 - 261
Received: 08 May 2021
Accepted: 12 May 2021
Published online: 31 Dec 2013 *