Real Time Servo Analysis of Non-Linear Conical Tank Level Control using Root Locus Technique

In modern process control industries, the feedback or closed control system plays a vital role. In this research work has been proposed the nonlinear conical tank system, among the different linear and nonlinear tanks are used in process industries. In the conical tank water level control is a very tricky task, due to its nonlinearity and variations present in their cross sectional area, when changing the water level at the desired set point. Hence, an optimal controller design is essential to sustain the water level in nonlinear conical tank. The controller tuning is very much essential for satisfactory closed loop performance of the particular process in terms of stability, to reducing the setting time, steady state error and minimal performance indices. The real time analysis of PI controller tuning parameters by Ziegler –Nichols Tuning (ZNT) and Root Locus Technique (RLT) are compared with the help of servo responses. The performance of PI controller is validated in terms of time domain specifications, IAE and ISE.