  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.
