Konrad J. Waluś

Comparative Analysis of the Roughness of Asphalt and Concrete Surface

The paper presents a comparative analysis of the measurement results of the roughness for two types of road surfaces. The tests were performed using the British pendulum on the airport auxiliary roads of the Aero Club Pila. The tests were done for concrete and bituminous pavement. The measurements were conducted at four measuring points of the cross section of the road and the roughness was measured six times at each point. The measurements were repeated at every 30m for the longitudinal section of the road with the length of 120m. This situation allowed us to elaborate our own roughness maps of the investigated road surfaces in a form of 3D charts. The authors have assessed the state of the road surface contamination before and after the measurements. During the tests the authors have also conducted the environmental investigations in order to determine the parameters of the road surface and the environment. The roughness investigations are particularly important during safety determination of the road traffic. The parameters of the road surface have a direct impact on the behaviour of the vehicle, its acceleration, braking, steerability and motion stability. These parameters are defined by the interaction between the tyre and the ground.

Experimental Determination of Vehicle Lateral Drift Characteristics under Laboratory Conditions

Safe driving requires from the driver several visual-mental activities (perception, recognition and decide) and manual activities relating to the implementation of specific movements. Vehicle responding to the given force is subjected a three axial loads that are transferred through the frictional coupling of tire and pavement Generated during the movement, in particular, curvilinear, lateral drift forces act directly on the tire tread and indirectly by steering to the driver. The value of these forces depends on the angle of the lateral drift, motion parameters and surface type. The paper presents results of experimental determination of lateral forces on the drift the running machine with five-component hub.