System identification techinques for non linear level process

In a process industry, modeling of non-linear process (Interacting or Noninteracting) is one of the most critical step and pose challenges due to geometry. This paper presents the system identification techniques for a nonlinear process; and correlate with the mathematical model of a system model from process input and output. The techniques can be extended to develop generic system identification algorithms for analysis of MIMO nonlinear complex dynamical process.