Ratchet due to broken friction symmetry

Research output: Research - peer-reviewJournal article – Annual report year: 2002

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A ratchet mechanism that occurs due to asymmetric dependence of the friction of a moving system on its velocity or a driving force is reported. For this kind of ratchet, instead of a particle moving in a periodic potential, the dynamics of which have broken space-time symmetry, the system must be provided with sonic internal structure realizing such a velocity- or force-friction dependence. For demonstration of a ratchet mechanism of this type, an experimental setup (gadget) that converts longitudinal oscillating or fluctuating motion into a unidirectional rotation has been built and experiments with it have been carried out. In this device, an asymmetry of friction dependence on an applied force appears, resulting in rectification of rotary motion, In experiments, our setup is observed to rotate only in one direction, which is in accordance with given theoretical arguments, Despite the setup being three dimensional, the ratchet rotary motion is proved to be described by one dynamical equation. This kind of motion is a result of the interplay of friction and inertia. We also consider a case with viscous friction, which is irrelevant to this gadget, but it can be a possible mechanism of rotary unidirectional motion of some swimming organisms in a liquid.
Original languageEnglish
JournalPhysical Review E. Statistical, Nonlinear, and Soft Matter Physics
Volume65
Issue number1
Pages (from-to)011110
ISSN1063-651X
DOIs
StatePublished - 2002

Bibliographical note

Copyright (2002) American Physical Society

CitationsWeb of Science® Times Cited: 16

    Research areas

  • MICROORGANISMS, CHAOTIC TRANSPORT, ELECTROPHORESIS, CYANOBACTERIA, PROPULSION, DYNAMICS, DRY-FRICTION, MOLECULAR MOTORS, INERTIA RATCHETS, DIRECTIONAL MOTION
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