Fractional Order Modeling of Human Operator Behavior with Second Order   Controlled Plant and Experiment Research
  Modeling human operator's dynamic plays a very important role in the manual closed-loop control system, and it is an active research area for several decades. Based on the characteristics of human brain and behaviour, a new kind of fractional order mathematical model for human operator in SISO systems is proposed. Compared with the traditional models based on the commonly used quasi-linear transfer function method or the optimal control theory method, the proposed fractional order model has simple structure with only few parameters, and each parameter has explicit physical meanings. The actual data and experiment results with the second-order controlled element illustrate the effectiveness of the proposed method. 
Jiacai Huang, Yangquan Chen, Haibin Li, Xinxin Shi
cs.SY