摘要翻译:
最近的研究表明,使用反馈控制可以改善闪光棘轮的性能。利用Langevin动力学仿真研究了闭环集体闪光棘轮反馈控制中时滞的影响。令人惊讶的是,对于一个大的系综,一个精心选择的延迟时间通过允许系统同步到准周期稳定振荡模式来改善棘轮性能,该模式再现了周期性闪烁棘轮的最佳平均速度。另一方面,对于一个小的集成,有限的延迟时间大大降低了反馈控制对时间平均速度的好处,因为信息的相关性在一个由粒子扩散时间设定的时间尺度上衰减。基于这些结果,我们确定反馈控制的实验使用是现实的。
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英文标题:
《Effect of time delay on feedback control of a flashing ratchet》
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作者:
E. M. Craig, B. R. Long, J. M. R. Parrondo, and H. Linke
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最新提交年份:
2007
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分类信息:
一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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英文摘要:
It was recently shown that the use of feedback control can improve the performance of a flashing ratchet. We investigate the effect of a time delay in the implementation of feedback control in a closed-loop collective flashing ratchet, using Langevin dynamics simulations. Surprisingly, for a large ensemble, a well-chosen delay time improves the ratchet performance by allowing the system to synchronize into a quasi-periodic stable mode of oscillation that reproduces the optimal average velocity for a periodically flashing ratchet. For a small ensemble, on the other hand, finite delay times significantly reduce the benefit of feedback control for the time-averaged velocity, because the relevance of information decays on a time scale set by the diffusion time of the particles. Based on these results, we establish that experimental use of feedback control is realistic.
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PDF链接:
https://arxiv.org/pdf/707.0901