Circular ratchets as transducers of vertical vibrations into rotations.
Granular ratchets are well-known devices that when driven vertically produce a counterintuitive horizontal transport of particles. Here we report the experimental observation of a complementary effect: the striking ability of circular ratchets to convert their vertical vibration into their own rotation. The average revolution speed shows a maximum value for an optimal tooth height. With no special effort the rotation speed could be maintained steady during several hours. Unexpected random arrests and reversals of the velocity were also observed abundantly.
Institute for Multiscale Simulations, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91052 Erlangen, Germany.
Michael
M
Heckel
Patric
P
Müller
Thorsten
T
Pöschel
Jason A C
JA
Gallas
D001703:Biophysics / Q000379:methods*; D003198:Computer Simulation; D004867:Equipment Design; D005740:Gases; D020409:Molecular Motor Proteins / Q000737:chemistry; D009038:Motion; D012399:Rotation; D013269:Stochastic Processes; D013997:Time Factors
D005740:Gases; D020409:Molecular Motor Proteins