Anisotropy-driven dynamics in vibrated granular rods

摘要: The dynamics of a set rods bouncing on vertically vibrated plate is investigated using experiments, simulations, and theoretical analysis. experiments simulations are performed within an annulus to impose periodic boundary conditions. Rods tilted with respect the vertical observed spontaneously develop horizontal velocity depending acceleration plate. For high acceleration, always move in direction tilt. However, also opposite tilt for small range rod A phase diagram motion presented as function which varied by changing number inside annulus. Next we introduce molecular method simulate dimensions dissipation parameters from experiments. We reproduce speeds simulations. By decreasing friction between base zero simulation, identify during collision crucial ingredient occurrence motion. Guided data construct mechanical model limit thin rods. starting point analysis single oscillating Three regimes identified: slide, slip-stick, slip reversal. formula derived angle. Good agreement found theory.