Investigation into the damping coefficient of particles engaged in elastic collisions through the utilization of the acoustic sampling method

Abstract

Abstract The damping coefficient, an important parameter in discrete element simulations, characterizes the energy dissipation that occurs during particle collisions. Nevertheless, the factors that affect the damping coefficient are not yet clearly defined, and the precise measurement of this coefficient for most materials remains unresolved. This investigation explored the damping coefficients of 9 representative particles using the acoustic sampling method. The relationship between the damping coefficient, collision velocity, material density, and specific strength was also analyzed. This study reveals that the damping coefficient is not highly influenced by velocity in particles composed of highly elastic materials. However, particles made of moderately and weakly elastic materials exhibit an increase in the damping coefficient as velocity rises. Furthermore, the damping coefficient of particles displays a linear association with material density. Materials with lower specific strength exhibit a wider range of variation in their damping coefficients, whereas materials with higher specific strength maintain a more stable damping coefficient around 0.4.