Analytical study of oscillating horizontal vibrations of a road roller

Abstract

Horizontal oscillating vibrations of a vibratory road roller are of secondary importance in comparison with vertical vibrations that compact soil and asphalt concrete. The consideration of horizontal vibrations is required for the improvement of the vibratory roller design aimed at reducing the overall accompanying vibration on the vibratory roller and on a human operator, as well as for the calculation of vibration exciter rolling bearings and rubber-metal shock absorbers. Two research tasks of vibratory drum horizontal vibrations on a solid non-deformable base have been solved in the article. The assumption has been made in the first task that there is sliding friction between the cylindrical roller and bearing surface; in the second research task of horizontal vibrations the cylindrical drum rolls over a solid bearing surface without slipping. The mode of horizontal oscillating vibrations differs in phase from the mode of vertical oscillating vibrations by the angle φ = 0.5π. When creating vibratory rollers, manufacturing companies strive for increasing the operation efficiency of vibratory rollers at the expense of increasing the centrifugal exciting force while maintaining or reducing the total weight of the vibratory roller. As a result of which the oscillation mode appeared where negative effects of additional loading of rubber-metal shock absorbers were found, connecting the vibratory drum with the roller front frame and increasing the overall vibration of the vibratory roller. Dependences of horizontal travels, speed and acceleration of a vibratory drum have been determined during the road roller forward movement. During one turn of the vibration exciter rotation the forward movement of the drum becomes a non-uniform one, i.e. it takes an oscillating vibrating nature. Rules and recommendations have been developed for the study of sliding conditions, vibratory drum balancing over the bearing surface etc.