Experimental evaluation of a controller using a variable transformation Smith predictor for a nonlinear process with dead time

In this work, a globally linearised controller (GLC) for a hemispherical tank level process with dead time is experimentally evaluated. A controller based on the combination of Smith predication and variable transformation [Anandanatarajan R, Chidambaram M, Jayasingh T, Design of controller using variable transformations for a nonlinear process with dead time. ISA Trans 2005;44:81-91] in the transformed domain is used in simulation of and experimentation on a hemispherical tank level process. The results are compared with those obtained with the conventional PI controller, about the nominal operating point of 50%.