棘轮势作用下布朗马达的反馈控制模型  

A Feedback-controlled Model of Brownian Motors in Ratchet Potential

作　　者：张红卫[1,2] 文书堂[3] 张海涛[1] 李玉晓[1] 

机构地区：[1]郑州大学物理工程学院,河南郑州450001 [2]郑州师范学院物理与电子科学系,河南郑州450044 [3]新乡学院化学与化工学院,河南新乡453003

出　　处：《郑州大学学报（理学版）》2012年第4期73-77,共5页Journal of Zhengzhou University:Natural Science Edition

基　　金：河南省科技厅基础与前沿技术研究计划资助项目;编号092300410142

摘　　要：研究了棘轮势作用下的布朗马达的一种反馈控制模型.温度开关根据布朗粒子的受力情况来确定环境温度的变化,从而控制马达的运动.通过数值模拟得到了马达定向运动的流.当温度比值参数β<1时,流总是负的;β>1时流的大小和方向都与棘轮势的不对称参数有关.研究结果表明,流的正负是马达热运动的能量与势垒能量竞争的结果.A model of Brownian motor in period ratchet potential under a feedback control was studied,which changed the surrounding temperature according to the particle＇s force.By numerical simulations,the directed current was obtained.When β1（the ratio of switching temperature）,the current was always negative,but when β1,the current was correlated to the asymmetry of the potential in value and direction.The results showed that the direction of the current was the competition of thermal motion and the potential energy.

关 键 词：反馈控制 布朗马达 棘轮势 

分 类 号：O552.1[理学—热学与物质分子运动论]