Heckel Michael, Müller Patric, Pöschel Thorsten, Gallas Jason A C
Institute for Multiscale Simulations, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91052 Erlangen, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Dec;86(6 Pt 1):061310. doi: 10.1103/PhysRevE.86.061310. Epub 2012 Dec 14.
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.
颗粒棘轮是一种众所周知的装置，当垂直驱动时，会产生违反直觉的颗粒水平运输。在这里，我们报告了一种互补效应的实验观察结果：圆形棘轮将其垂直振动转化为自身旋转的惊人能力。平均转速在最佳齿高时显示出最大值。无需特别努力，转速就能在几个小时内保持稳定。还大量观察到了意想不到的随机停顿和速度反转。
