BPCPPDYSOE21 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 6: Granular Physics 1 - organized by Matthias Sperl (Köln)
DY 6.3: Vortrag
Montag, 22. März 2021, 10:10–10:30, DYc
Coupling between rotational and translational motions of a vibrated polygonal disk — •Simeon Voelkel1 and Kai Huang1,2 — 1Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany — 2Institute of Applied Physical Sciences and Engineering, Division of Natural and Applied Sciences, Duke Kunshan University, No. 8 Duke Avenue, Kunshan, Jiangsu, China 215316
We investigate experimentally the dynamics of a single polygonal disk (regular n-gon with 3 ≤ n ≤ 8) under vertical vibrations against gravity. The disks tend to precess continuously upon vibrations, transferring the mechanical energy injection into the rotational as well as the translational degrees of freedom (DoF) spontaneously. An analysis of the velocity distribution functions in both DoF suggests that the mobility in both DoF are coupled with each other with a preferred angular velocity that depends on the confinement, the geometry of the disk as well as the driving condition. The favored angular velocity can be captured with a model considering sustainable precession due to continuous driving. We also find a regime in the parameter space where the kinetic energy in both DoF agree with each other, despite of the strong energy dissipation and fluctuations in the system upon frequent collisions of the disk with the vibrating plates.