Abstract
The paper analyses the impact of the road micro-profile on the duration and the type of the vehicle wheel contact with the road surface driving at different speed. The selected vehicle bicycle model describes vertical displacements of front and rear wheels and their suspension as well as the impact of the vehicle body motion and longitudinal oscillation. International Roughness Index (IRI) and micro-profile irregularities of the road section analysed in the paper were identified using specialized road testing equipment. The experimental investigations measuring the vehicle suspension displacement and the body acceleration were carried out. Frequency characteristics of suspension motion and regularities of vertical movement of the wheel were identified after dividing the investigated road section according to driving modes. The analysis into the wheel contact with the road surface and identified correlations enable to determine the vehicle stability on selected quality roads.
Highlights
The interaction between a vehicle and road pavement can be investigated as the subsystem driver-vehicleroad-environment and as each separate element of this system
This paper provides the analysis of the influence of rutting and asphalt pavement, mathematical models are measured road pavement irregularities on vehicle susconstructed and applied to analyse the reactions of a ve- pension work in different driving modes and presents hicle moving on a rough road (Fwa et al 2012)
Measurement results pertaining to the micro-profile of the road can help to rather accurately predict the interaction between a vehicle dynamics parameters, such as suspension displacement, wheel motion, and a road pavement irregularities
Summary
The interaction between a vehicle and road pavement can be investigated as the subsystem driver-vehicleroad-environment and as each separate element of this system. The environmental impact, pollution, traffic flows of heavy vehicles and passenger cars have a negative impact on the road and its pavement structure. Road pavement roughness has a negative impact on the vehicle construction and, as a result, on traffic safety (Zaabar, Chatti 2011). Evaluation of road user costs including repair and maintenance costs and cargo damage is performed using vehicle-road interaction models (Zaabar, Chatti 2010). Road roughness causes a spectrum of oscillations for a moving vehicle and influences the accelerations of sprung and unsprung masses. The power spectral density characteristics of road profile can be estimated using straight line approximation. Approximation of three unconnected lines has the closest fitting to measured results and 6÷14% of mean error (Múčka 2012a, 2012b)
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