Calculation of the motion of particles ejected from the spreading disc of a special road machine when changing the disc height

Abstract

This article analyzes the effect of changing the height of the spreading disc of a special road machine on the motion trajectory and rebound height of technological material particles. Based on theoretical calculations and practical experimental results, the relationships among the particle ejection angle, restitution coefficient, and disc rotational speed were determined. The experiments were conducted at a disc speed of 450 rpm, at various heights (h = 0.4–0.6 m), and on different surface types (rubber, metal, asphalt). The results showed that the particle rebound height is directly proportional to the disc height and ejection angle, and that moisture and weather conditions significantly affect the restitution coefficient. The research findings have practical importance for determining the optimal geometric and kinematic parameters of the spreading system and ensuring uniform distribution of technological materials over the road surface.