Saeed Tavakoli - University of Sistan and Baloochestan
Ian Griffin - University of Sheffiel d
Peter J. Fleming - University of Sheffiel d

Using dimensional analysis and numerical optimisation techniques, an optimal PID tuning method for second order plus dead time processes is proposed. Considering a step change in setpoint, PID tuning formulae are developed through minimising an objective function. To consider robustness issues, the optimisation problem is constrained so that a minimum gain margin of 3 and a minimum phase margin of 60° are guaranteed. Simulation results show that the proposed tuning formulae are effectively applicable to a large variety of processes.

PID control, SOPDT process, NDT technique