A feedback control of fluctuations in simple molecular dynamics

Hiroyasu Ando, Miki U. Kobayashi

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


Suppression of diffusion processes generated by fluctuations in small-scale systems is crucial for its manipulation especially in nanotechnology. In this work, we focus on thermal fluctuations and their diffusion effect in a model of molecular dynamics. First, we propose timedelayed feedback control method instead of decreasing temperature which is a conventional way of controlling thermal fluctuations. We investigate numerically an effect of delayed-feedback on random walks in discrete time systems and find that diffusion processes of the controlled random walk is suppressed with increasing delay time. Second, we apply the proposed method to simple models of molecular dynamics which are composed of a single particle as well as two flocculated ones with the Lennard-Jones potential. Numerical simulations of the molecular dynamics show the effectiveness of the proposed method for suppressing diffusion processes observed in molecular dynamics.

Original languageEnglish
Pages (from-to)262-266
Number of pages5
Issue number18
Publication statusPublished - 2015 Nov 1
Externally publishedYes
Event4th IFAC Conference on Analysis and Control of Chaotic Systems, CHAOS 2015 - Tokyo, Japan
Duration: 2015 Aug 262015 Aug 28


  • Delayed feedback control
  • Diffusion
  • Molecular dynamics
  • Stochastic process

ASJC Scopus subject areas

  • Control and Systems Engineering


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